CN104639283A - Method for reconfirming GSM (global system for mobile communications) measurement in connected state under LTE (long term evolution) mode - Google Patents
Method for reconfirming GSM (global system for mobile communications) measurement in connected state under LTE (long term evolution) mode Download PDFInfo
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Abstract
The invention relates to a method for reconfirming GSM (global system for mobile communications) measurement in the connected state under the LTE (long term evolution) mode. The method includes the steps of a, acquiring the position, determined in previous GSM, of a first synchronization pulse and timing offset between the first synchronization pulse and a first measurement gap; b, according to the position of the first synchronization pulse and the timing offset between the first synchronization pulse and the first measurement gap, determining the position of a second synchronization pulse and a second measurement gap which are reconfirmed by the GSM; c, judging whether reconfirming of a BSIC (base station identity code) is successful or not by comparing whether the position of a third synchronization pulse and acquired by BSIC decoding is identical to the determined position of the second synchronization pulse or not.
Description
Technical field
The present invention relates to LTE(Long Term Evolution, Long Term Evolution) system, especially relate to a kind of method measured GSM during lower connected state and heavily confirm under LTE pattern.
Background technology
LTE is the Long Term Evolution of the UMTS technical standard organized to set up by 3GPP.LTE system introduces the critical transmissions technology such as OFDM and multiple antennas MIMO, (peak rate can reach up 50Mbit/s to significantly increase spectrum efficiency and message transmission rate, descending 100Mbit/s), and support that various bandwidth is distributed: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz etc., spectrum allocation may is more flexible, and power system capacity and covering significantly promote.
Along with the commercialization of LTE technology, many countries and regions or be about to dispose LTE network.At the networking initial stage, LTE network is difficult to the coverage rate of accomplishing 100%.In comparison, existing 2G internet and 3G network then has good covering.Therefore, utilize 2G and 3G network to cover, keep the business continuance of LTE user to become the main flow implementation strategy of mobile operator.In order to ensure the continuity of business, terminal also must support 2G, 3G and LTE pattern.Therefore, LTE terminal is generally multimode terminal, and supports that GSM mode is also main flow.
When carrying out business under LTE pattern, need to carry out GSM nearby region measurement.This just requires that terminal periodically can capture the synchronizing channel (SCH) of GSM adjacent area at the connected state of LTE.This is that the lock-out pulse (SB) sent by receiving GSM network realizes.By base station identity code (Base Station Identity Code, the BSIC) information of carrying in decoding lock-out pulse, frame number and the timing information of GSM just can be obtained.The position of lock-out pulse is in 1,11,21,31,41 TS0 of 51 multi-frames of GSM.
Fig. 1 is 51 multi-frame structure schematic diagrames of GSM mode.In Fig. 1, the numbering of F represents that frequency Correction Burst happens suddenly, the numbering of B represents the message blocks (TS0 of 4 continuous T DMA frames) for BCCH, the numbering of C represents the message blocks (TS0 of 4 continuous T DMA frames) for CCCH, and the numbering of S is exactly the position of lock-out pulse, and I represents idle.
After terminal first time captures the synchronizing channel of GSM adjacent area, need the synchronizing channel of periodically this community of recapture, and safeguard.3GPP agreement is defined under LTE is in RRC_CONNECTED state, and carrying out measurement to alien frequencies or different system adjacent cell needs to use measurement clearance (GAP).Measurement clearance is that agreement regulation is specifically designed to that to carry out the length that alien frequencies or different system adjacent cell measure be the sequential time slices of 6ms.Measurement clearance configuration is as shown in table 1 below:
Measurement clearance Configuration Type under table 1LTE
| Gap-type | Gap period (ms) |
| 0 | 40 |
| 1 | 80 |
Although the gap length under LTE is 6ms, the actual time span that can be used for receiving pilot frequency point data is less than 6ms.This is because the frequency of receiver there occurs change, frequency switches needs the regular hour.Agreement regulation as shown in Figure 2.
When the center of the lock-out pulse of GSM is in the center ± 2350 μ s in gap, so terminal just can correctly be decoded to lock-out pulse.
Simultaneously agreement also specify the time requirement heavily confirmed: when LTE is in RRC_CNNT state, has needed the measurement to GSM adjacent area, needs the BSIC signal of maintenance 8 independently GSM communities at the most.Initially confirm successfully when completing BSIC to the adjacent area of GSM, need heavily to confirm.BSIC heavily confirms that requirement is at least every 8*T
re-confirm, GSMsecond completes BSIC to acknowledged community and heavily confirms.
Table 2 heavily confirms the required time
In current implementation, when the BSIC completing GSM adjacent area initially confirms successfully, to carry out when BSIC heavily confirms can each for the measurement clearance of GSM in attempt.But lock-out pulse may not necessarily intactly drop in this measurement clearance, possibly cannot complete GSM data receiver, naturally also cannot complete the decoding of BSIC.Like this, when the BSIC of GSM will be caused heavily to confirm, the efficiency that measurement clearance uses is too low.And extra number of attempt adds the expense of terminal.In addition, uncertain number of attempt causes the heavily confirmation of BSIC to complete on time, and heavy acknowledging time is uncontrollable.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method measured GSM during connected state and heavily confirm under LTE pattern, can divide the measurement clearance being used in and heavily confirming exactly.
The present invention is that to solve the problems of the technologies described above the technical scheme adopted be a kind ofly under LTE pattern, measure the method that heavily confirms of GSM during connected state, comprises the following steps: a. obtains the position of the first lock-out pulse and the timing offset between this first lock-out pulse and the first measurement clearance that previous GSM confirms; B. the position of the second lock-out pulse that GSM heavily confirms and the position of the second measurement clearance is determined according to the position of the first lock-out pulse and the timing offset between the first lock-out pulse and the first measurement clearance; And whether c. is identical with the position of fixed second lock-out pulse by the position of the 3rd lock-out pulse of the acquisition of contrast BSIC decoding, judges that BSIC is heavily confirmed whether successfully.
In one embodiment of this invention, this previous GSM confirms as GSM and initially confirms.
In one embodiment of this invention, this previous GSM confirms as GSM and heavily confirms.
In one embodiment of this invention, the timing offset between this second lock-out pulse and this second measurement clearance is identical with timing offset between this first lock-out pulse with this first measurement clearance.
In one embodiment of this invention, in step c, when the position of the 3rd lock-out pulse of the acquisition of BSIC decoding is identical with the position of the second lock-out pulse that this is determined, show that BSIC heavily confirms successfully, on the contrary then unsuccessful.
In one embodiment of this invention, also comprise after step a: a1. judges whether the timing offset between this first lock-out pulse and this first measurement clearance exceeds a threshold range; If so, then the position of this second lock-out pulse and the position of this second measurement clearance is determined according to a correcting mode in stepb.
In one embodiment of this invention, in step a1, if the timing offset between this first lock-out pulse and this first measurement clearance exceeds a Lower Threshold, the position of this second measurement clearance is then determined according to one first correcting mode, if the timing offset between this first lock-out pulse and this first measurement clearance exceeds a Upper threshold, then determine the position of this second measurement clearance according to one second correcting mode.
In one embodiment of this invention, in stepb, the position of this second measurement clearance is by the time interval between this second measurement clearance and this first measurement clearance.
In one embodiment of this invention, in stepb, determine that the step of the position of the second lock-out pulse that GSM heavily confirms and the position of the second measurement clearance comprises according to the position of the first lock-out pulse and the timing offset between the first lock-out pulse and the first measurement clearance: the benchmark concordance list of corresponding relation of position comprising the position of this first lock-out pulse, the position of this second lock-out pulse and this second measurement clearance by the location lookup one of this first lock-out pulse.
In one embodiment of this invention, determine that the step of the position of this second lock-out pulse and the position of this second measurement clearance comprises according to a correcting mode in stepb: the correction concordance list of corresponding relation of position comprising the position of this first lock-out pulse, the position of this second lock-out pulse and this second measurement clearance by the location lookup of this first lock-out pulse.
The present invention is owing to adopting above technical scheme, and the timing information confirmed by previous GSM and measurement clearance position, obtain the measurement clearance position that GSM heavily confirms exactly.Compared with the scheme of prior art, the present invention can avoid, because repeatedly attempting the expense caused, simplifying the enforcement that GSM heavily confirms.
Accompanying drawing explanation
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 is 51 multi-frame structure schematic diagrames of GSM mode.
Fig. 2 illustrates the demand of catching lock-out pulse (SB) that 3GPP agreement specifies.
Fig. 3 illustrates the schematic diagram initially confirming successfully to obtain afterwards timing relationship according to one embodiment of the invention BSIC.
Fig. 4 illustrates that BSIC heavily confirms and the timing relationship initially confirmed.
Fig. 5 measures the method flow diagram that GSM heavily confirms when connected state under LTE pattern is according to an embodiment of the invention shown.
Fig. 6 measures the method flow diagram that GSM heavily confirms when connected state under LTE pattern is according to another embodiment of the present invention shown.
Embodiment
Saying of summary, measures the method that GSM heavily confirms when embodiments of the invention describe connected state under a kind of LTE pattern.This method is intended to distribute measurement clearance (GAP) exactly and heavily confirms to complete, and avoids the trial cannot determined for the enterprising places number of measurement clearance that GSM measures at each.The present invention can implement on the various portable electric appts with mobile communication function such as mobile phone, panel computer.
It is known that BSIC be heavily confirmed to be successfully completed initial confirm after carry out.When initially confirming, terminal is by obtaining following two information to catching of lock-out pulse (SB) with decoding:
1, the position of SB: SB is arranged in which TS0 of 51 multi-frames, namely 1,11,21,31, which value in 41}.
2, the timing relationship between SB and GAP, can be represented by the time difference of effective original position time of the original position of SB and GAP.As shown in Figure 3, t
offsetbe the time difference of the original position of SB and effective original position time of GAP.
According to embodiments of the invention, when heavily confirming after initial confirmation, first determine the GAP position can catching SB.Method is as follows:
Suppose being numbered k) of this SB when the GAP of numbering n captures SB(, and complete BSIC and initially confirm.So suppose that the GAP of n+N numbering also successfully can capture SB(and suppose that this SB's is numbered k+K).Condition is the timing relationship between the GAP of numbering n and the SB being numbered k, identical with the timing relationship between the GAP of numbering n+N and the SB being numbered k+K.
Fig. 4 illustrates that BSIC heavily confirms and the timing relationship initially confirmed.As shown in Figure 4, parameter K and N should meet t
offset=t '
offset.
Find and meet t
offset=t '
offsetthe value of K and N, and the time difference between these two GAP meet the protocol requirement of table 2, then the GAP of numbering n+N just may be used for the heavily confirmation of BSIC.So just can calculate the GAP that successfully can carry out BSIC and heavily confirm accurately.
Following formula is used to state description above:
t
gap,n+N-t
gap,n=t
sb,k+K-t
sb,k(1)
The implication of parameters is as follows:
T
gap, n: the initial time being numbered the GAP of n,
T
gap, n+N: the initial time of the GAP of numbering n+N,
T
sb, k: the initial time of the SB of numbering k,
T
sb, k+K: the initial time of the SB of numbering k+K.
According to background knowledge, above formula is revised as:
N*T
gap=M*T
51_frame+t
sb_diff_intra_51_frame(2)
In above formula (2), parameter is as follows:
T
gap: in the cycle of GAP, value is 40ms or 80ms.
N: the number of the GAP namely between the GAP of the above-described n+N of being numbered and the GAP being numbered n.
T
51_frame: the length of 51 multi-frames, value is
M: be numbered the 51 complete multi-frame numbers between the SB of k and the SB being numbered k+K.
T
sb_diff_intra_51_frame: be numbered timing offset in the frame between the SB of k and the SB being numbered k+K.T
sb_diff_intra_51_framevalue and the position of SB within 51 multi-frames have relation, as shown in table 3:
Table 3SB position and t
sb_diff_intra_51_framevalue
Like this according to the length of 51 multi-frames, the value of GAP Cycle Length and table 3, just can draw the numbering added value N that can carry out the GAP that BSIC heavily confirms.
In one embodiment, above-mentioned computational process can be completed in advance, work out following concordance list:
The GAP added value that table 1BSIC heavily confirms
Use the SB location lookup aforementioned index table of previous confirmation, the GAP numbering added value N and SB position that heavily confirm can be obtained.In upper table, the value of N meets the time heavily confirmed of protocol requirement in table 2, namely meets protocol requirement, concept feasible.
Search being exemplified below of concordance list:
If the cycle of GAP is 40ms, BSIC when initially confirming, decoding show that the position of this SB is 31, then learn by tabling look-up, and the 34th GAP completed after the GAP that BSIC initially confirms can complete SB and heavily confirm.This GAP decodes SB position when heavily confirming should be 11.
The benefit obtaining the position of SB is, by judging the position of the SB that BSIC decodes and the position of predetermined SB, can judge that BSIC is heavily confirmed whether successfully.
Heavily confirm successfully, store the position of this GAP numbering added value and SB.
Further, based on the GAP numbering added value of this heavy confirmation and the position of SB, the position of the GAP numbering added value that next time heavily confirms and SB still can be determined according to the method for above-described embodiment.
When the timing of terminal adjusts, or the t between SB and GAP that cause of timing wander
offsetvalue when changing, need to judge whether to revise the numbering added value of GAP.T between SB and GAP
offsetbe accumulated to a certain degree, if do not revised GAP numbering added value, then likely cause SB only some to drop in GAP active position.Suitably revise with regard to needs like this, with avoid subsequent captured less than.
According to one embodiment of the invention, modification method is as follows:
When the SB original position captured is from GAP effective original position difference t
offsetwhen exceeding Upper threshold, the GAP of record numbering is revised with the first correcting mode; When the SB original position captured is from GAP effective original position difference t
offsetduring lower than Lower Threshold, the GAP of record numbering is revised with the second correcting mode.
Equally, following correction concordance list can be made by direct aforementioned correcting mode:
The GAP that table 5BSIC heavily confirms revises---lower than Lower Threshold
The GAP that table 6BSIC heavily confirms revises---higher than Upper threshold
Therefore, when needs are revised, the SB location lookup aforementioned index table of previous confirmation can be used, obtain the GAP numbering added value N and SB position that heavily confirm.
Realization is exemplified below:
When certain confirms, SB place frame number is 11, and the distance t of the original position of SB and the effective original position of GAP
offsetwhen exceeding Upper threshold, then need to revise the GAP position heavily confirmed next time.6 can show that next BSIC heavily confirms as by tabling look-up: the 20th GAP after this GAP can capture SB, and the frame number at new SB place should be 31.
Heavily confirm successfully at use amendment scheme, then judge the original position of SB and the distance t of the effective original position of GAP
offsetwhether exceed thresholding, if do not exceed thresholding, then still use table 4 is determined; If exceed thresholding, then according to the method for comparative result option table 5 or table 6.
Fig. 5 measures the method flow diagram that GSM heavily confirms when connected state under LTE pattern is according to an embodiment of the invention shown.Conclude, the method for the present embodiment comprises the following steps:
In step 501, obtain the position of the first lock-out pulse and the timing offset between this first lock-out pulse and the first measurement clearance of previous GSM confirmation;
At this, it may be initial confirmation that previous GSM confirms, also may be heavily confirm.
In step 502, determine the position of the second lock-out pulse that GSM heavily confirms and the position of the second measurement clearance according to the position of the first lock-out pulse and the timing offset between the first lock-out pulse and the first measurement clearance.
Be appreciated that the timing offset between the second lock-out pulse and the second measurement clearance, and the timing offset between the first lock-out pulse with the first measurement clearance can be identical, also can allow suitable error.
In step 503, whether identical with the position of fixed second lock-out pulse by the position of the lock-out pulse of the acquisition of contrast BSIC decoding, judge that BSIC is heavily confirmed whether successfully.
When the position of the lock-out pulse of the acquisition of BSIC decoding is identical with the position of fixed second lock-out pulse, show that BSIC heavily confirms successfully, on the contrary then unsuccessful.
Fig. 6 measures the method flow diagram that GSM heavily confirms when connected state under LTE pattern is according to another embodiment of the present invention shown.With reference to shown in Fig. 6, conclude, the method for the present embodiment comprises the following steps:
In step 601, obtain the position of the first lock-out pulse and the timing offset between this first lock-out pulse and the first measurement clearance of previous GSM confirmation;
In step 602, judge whether the timing offset between the first lock-out pulse and the first measurement clearance exceeds a threshold range, if so, then enter step 604, otherwise enter step 603;
In step 603, determine the position of the second lock-out pulse that GSM heavily confirms and the position of the second measurement clearance according to the position of the first lock-out pulse and the timing offset between the first lock-out pulse and the first measurement clearance;
In step 604, determine the position of the second lock-out pulse and the position of the second measurement clearance according to a correcting mode;
In this step, if whether the timing offset between the first lock-out pulse and the first measurement clearance exceeds a Lower Threshold, the first correcting mode can be selected, if whether the timing offset between the first lock-out pulse and the first measurement clearance exceeds a Upper threshold, one second correcting mode can be selected.
In step 605, whether identical with the position of fixed second lock-out pulse by the position of the lock-out pulse of the acquisition of contrast BSIC decoding, judge that BSIC is heavily confirmed whether successfully.
The method heavily confirmed of the terminal that embodiments of the invention propose measure GSM adjacent regions when LTE pattern is in connected state, computational process is simple and measurement result is accurate, navigates to the position of the GAP that can heavily confirm accurately.Further, can judge that BSIC is heavily confirmed whether successfully by the frame number of predetermined SB and the actual SB frame number decoded.Embodiments of the invention consider that the position of the SB position that timing adjustment or drift cause and GAP adjusts simultaneously, can complete the position of the GAP heavily confirmed according to differential location adjustment next time.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (10)
1. under LTE pattern, during connected state, measure the method that GSM heavily confirms, comprise the following steps:
A. the position of the first lock-out pulse and the timing offset between this first lock-out pulse and the first measurement clearance of previous GSM confirmation is obtained;
B. the position of the second lock-out pulse that GSM heavily confirms and the position of the second measurement clearance is determined according to the position of the first lock-out pulse and the timing offset between the first lock-out pulse and the first measurement clearance; And
C. whether identical with the position of fixed second lock-out pulse by the position of the 3rd lock-out pulse of the acquisition of contrast BSIC decoding, judge that BSIC is heavily confirmed whether successfully.
2. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 1, it is characterized in that, this previous GSM confirms as GSM and initially confirms.
3. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 1, it is characterized in that, this previous GSM confirms as GSM and heavily confirms.
4. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 1, it is characterized in that, timing offset between this second lock-out pulse and this second measurement clearance is identical with timing offset between this first lock-out pulse with this first measurement clearance.
5. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 1, it is characterized in that, in step c, when the position of the 3rd lock-out pulse of the acquisition of BSIC decoding is identical with the position of the second lock-out pulse that this is determined, show that BSIC heavily confirms successfully, on the contrary then unsuccessful.
6. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 1, is characterized in that, also comprise after step a:
A1. judge whether the timing offset between this first lock-out pulse and this first measurement clearance exceeds a threshold range;
If so, then the position of this second lock-out pulse and the position of this second measurement clearance is determined according to a correcting mode in stepb.
7. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 6, it is characterized in that, in step a1, if the timing offset between this first lock-out pulse and this first measurement clearance exceeds a Lower Threshold, the position of this second measurement clearance is then determined according to one first correcting mode, if the timing offset between this first lock-out pulse and this first measurement clearance exceeds a Upper threshold, then determine the position of this second measurement clearance according to one second correcting mode.
8. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 1, it is characterized in that, in stepb, the position of this second measurement clearance is by the time interval between this second measurement clearance and this first measurement clearance.
9. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 1, it is characterized in that, in stepb, determine that the step of the position of the second lock-out pulse that GSM heavily confirms and the position of the second measurement clearance comprises according to the position of the first lock-out pulse and the timing offset between the first lock-out pulse and the first measurement clearance: the benchmark concordance list of corresponding relation of position comprising the position of this first lock-out pulse, the position of this second lock-out pulse and this second measurement clearance by the location lookup one of this first lock-out pulse.
10. the method measured GSM during connected state and heavily confirm under LTE pattern as claimed in claim 6, it is characterized in that, determine that the step of the position of this second lock-out pulse and the position of this second measurement clearance comprises according to a correcting mode in stepb: the correction concordance list of corresponding relation of position comprising the position of this first lock-out pulse, the position of this second lock-out pulse and this second measurement clearance by the location lookup of this first lock-out pulse.
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| CN102395139A (en) * | 2011-10-08 | 2012-03-28 | 中兴通讯股份有限公司 | Multimode single-standby terminal different-mode type neighbor cell measurement time distribution method and device |
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| US20090022062A1 (en) * | 2007-06-25 | 2009-01-22 | Interdigital Technology Corporation | Method and apparatus for performing inter-radio access technology measurements to support geran band scan |
| CN102196487A (en) * | 2011-06-03 | 2011-09-21 | 展讯通信（上海）有限公司 | Third-generation (3G) system neighbor cell measurement method for multi-card multi-mode mobile terminal |
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