CN1567781A - A method for improving air signal transmission quality of CDMA system - Google Patents
A method for improving air signal transmission quality of CDMA system Download PDFInfo
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- CN1567781A CN1567781A CN 03139615 CN03139615A CN1567781A CN 1567781 A CN1567781 A CN 1567781A CN 03139615 CN03139615 CN 03139615 CN 03139615 A CN03139615 A CN 03139615A CN 1567781 A CN1567781 A CN 1567781A
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Abstract
The inventions provides a method of improving the aerial transmission quality of CDMA signals, assuring the alignment of forward service frame time of transmission signal in CDMA system, and its character: it includes the steps: obtaining system time on a base station controller BSC from any one service frame of the transmission signal and calculating a sequence number of the forward service frame; comparing the sequence number with an expected sequence number of forward service frame, calculated by the system time obtained by a base station transceiver BTS; judging whether to write the forward service frame in chips, discard or write in buffer region, thus assuring the strict alignment of transmission time of the forward service frame to improve the aerial transmission quality of the signal and aerial compensatory transmission quality.
Description
Technical field
The present invention relates to a kind of radio mobile communication method for transmitting signals, relate in particular to and a kind ofly improve the method for cdma system signal aerial transmission quality by guaranteeing that cdma system signal forward business frame time aligns.
Background technology
In cdma system, BSC (base station controller) and BTS (base station transceiver) are responsible for the transmission of forward business frame jointly.Under the situation of soft handover, BSC can send identical forward business frame to a plurality of BTS at synchronization.But owing to have time-delay, there is the network delay on the BTS simultaneously and handles time-delay, can cause BTS to the moment of aerial this traffic frame of transmission difference at signaling interface.When MS (travelling carriage) carries out the frame merging in the restituted signal process, since the existence of the problems referred to above, the content frame difference that can cause MS to merge at synchronization, and the frame after promptly merging will be a mess code, thereby increased aerial frame error rate, had a strong impact on the aerial transmission of signals quality.In addition, the stric consistency of forward complement channel time in the cdma system, it is in full accord also to require MS to start time of time of complement channel and base station initiated complement channel, and because the time-delay of the Abis interface (interface of base station controller and base station) between BSC and BTS existence, can cause both time can not complete matching, thereby cause the frame losing of whole airlink, influenced the aerial transmission of signals quality.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method that improves cdma system signal aerial transmission quality simply, effectively, overcomes the forward business frame inconsistent problem that causes signal transmission quality the to worsen time of advent in the prior art by guaranteeing that cdma system signal forward business frame time aligns.
To achieve these goals, the invention provides a kind of method that improves cdma system signal aerial transmission quality, be used for guaranteeing that the forward business frame time at the cdma system transmission signals aligns, its characteristics are, comprise the steps: in arbitrary traffic frame of transmission signals, to obtain the system time on the base station controller BSC, and calculate the sequence number of this forward business frame; The forward business frame number of the expectation that this sequence number and the system time that obtains by base station transceiver BTS are calculated is compared; Judge whether that this forward business frame write chip or abandon or it is write buffer area, thereby guarantee the strict alignment of transmitting time of this forward business frame.
Above-mentioned method, its characteristics are, further comprise the steps:
In the processing of this forward business frame, will obtain system time from base station controller and be converted into from a certain zero-time α to come the traffic frame number A of current time;
By test, obtain the maximum delay of system when sending the forward business frame, with the number B of its conversion framing;
A is carried out delivery with 2 * B, calculate the frame number C of this traffic frame, and this frame number C is deposited in the frame head of traffic frame, send this frame to base station transceiver;
Base station transceiver obtains system time after receiving this frame, and this system time is converted into the traffic frame number D of same zero-time α to the current time;
D with 2 * B delivery, is calculated the frame number E of expectation;
The frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, determine whether that this traffic frame write chip or abandon or write buffer area with etc. to be sent.
Above-mentioned method, its characteristics are that described system time is the pilot signal that sends by travelling carriage demodulation BSC, obtain with short pseudo-code phase information in acquisition base station and demodulation synchronizing channel.
Above-mentioned method, its characteristics are, in the step that the frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E=C, show that the forward business frame arrives on time, then it is write chip and send to travelling carriage.
Above-mentioned method, its characteristics are, in the step that the frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E＞C and E-C≤B, show that this forward business frame comes late, then it is abandoned;
Above-mentioned method, its characteristics are, in the step that the frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E＞C and E-C＞B, shown that this forward business frame has come early, the buffer area etc. of then this frame being put into corresponding frame number is to be sent.
Above-mentioned method, its characteristics are, in the step that the frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E＜C and C-E 〉=B, show that this forward business frame comes late, then it is abandoned.
The method of above-mentioned traffic frame time unifying, its characteristics are, in the step that the frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E＜C and C-E＜B, shown that this forward business frame has come early, the buffer area etc. of then this frame being put into corresponding frame number is to be sent.By the method for traffic frame time unifying of the present invention, guaranteed that the traffic frame content on the multilink that travelling carriage receives from air interface is identical, thereby reduced aerial frame error rate effectively, improved the aerial transmission of signals quality.
Method by traffic frame time unifying of the present invention, also make BSC can accurately control BTS and send out frame constantly to aerial, thereby reduced because travelling carriage and BSC time do not line up, both forward complement channels start the problem of inconsistent aerial transmission frame losing that causes constantly and aerial transmission quality decline, have improved the transmission quality of aerial complement channel effectively.
Further describe specific embodiments of the invention below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is T for system time
1, T
2The time frame number schematic diagram relatively;
Fig. 2 is T for system time
3, T
4The time frame number schematic diagram relatively;
Fig. 3 is the process chart of BSC side frame number;
Fig. 4 is the process chart of BTS side frame number verification.
Embodiment
As shown in Figure 3, this figure is the process chart of the frame number of BSC of the present invention (base station controller) side.In the processing of a certain forward business frame,, obtain the maximum delay of system when sending the forward business frame, with the number B of its conversion framing by test.This traffic frame comprises 3 steps in the processing procedure of BSC side, at first in step S101, obtain system time from BSC, promptly by the BSC pilot signal transmitted, make the travelling carriage in its area of coverage can provide carrier phase to realize coherent demodulation, after the travelling carriage demodulated pilot signal, can obtain the short pseudo-code phase information in base station, but the demodulation synchronizing channel also obtains basic system configuration parameter-system time, and this system time is converted into from a certain zero-time α to come the traffic frame number A of current time; In step S102, A is carried out delivery with 2 * B then, calculate the frame number C of this traffic frame, and this frame number C is deposited in the frame head of traffic frame; In step S103, this frame number is sent to BTS (base station transceiver) at last.
As shown in Figure 4, this figure is the process chart of BTS of the present invention (base station transceiver) side frame number verification.The verification of this frame number comprises that step is as follows, and in step S201, BTS receives the frame number C that sends from BSC, thereby obtains system time, and this system time is converted into the traffic frame number D of same zero-time α to the current time; In step S202, D with 2 * B delivery, is calculated the forward business frame number E of expectation then; Then the frame number E of frame number C in the traffic frame frame head that BTS is received and the expectation that calculates compares: if E=C shows that this forward business frame arrives on time, then it is write chip and send to MS (travelling carriage) (step S203); If E＞C and E-C≤B are T as system time among Fig. 1
1The time situation, show that this forward business frame comes late, it should be abandoned (step S204); If E＞C and E-C＞B are T as system time among Fig. 1
2The time situation, shown that this forward business frame has come early, then this frame is write the buffer area of corresponding frame number, with etc. (step S205) to be sent; If E＜C and C-E 〉=B are T as system time among Fig. 2
3The time situation, show that this forward business frame comes late, it should be abandoned (step S206); If E＜C and C-E＜B are T as system time among Fig. 2
4The time situation, shown that this forward business frame has come early, then this frame is write the buffer area of corresponding frame number, with etc. (step S207) to be sent.
Because all BTS have identical system time with BSC in the cdma system, therefore just guaranteed when soft handover exists by above-mentioned frame number method of calibration, the traffic frame sequence number of being sent on a plurality of BTS is identical, just the content of traffic frame is identical, thereby guaranteed that the traffic frame content on the multilink that travelling carriage receives from air interface is identical, thereby reduced aerial frame error rate effectively, improved the aerial transmission of signals quality.
Simultaneously, said method makes BSC can accurately control BTS and sends out frame constantly to aerial, thereby make that forward complement channel can complete matching in the transmitting time of BSC at start-up time of travelling carriage and complement channel traffic frame, reduced because travelling carriage and BSC time do not line up, both forward complement channels start the problem of inconsistent aerial transmission frame losing that causes constantly and aerial transmission quality decline, have improved the transmission quality of aerial complement channel effectively.
Claims (8)
1. a method that improves cdma system signal aerial transmission quality is used for guaranteeing that the forward business frame time at the cdma system transmission signals aligns, and it is characterized in that, comprises the steps:
In arbitrary traffic frame of transmission signals, obtain the system time on the base station controller BSC, and calculate the sequence number of this forward business frame;
The forward business frame number of the expectation that this sequence number and the system time that obtains by base station transceiver BTS are calculated is compared;
Judge whether that this forward business frame write chip or abandon or it is write buffer area, thereby guarantee the strict alignment of transmitting time of this forward business frame.
2, method according to claim 1 is characterized in that, further comprises the steps:
In the processing of this forward business frame, will obtain system time from base station controller and be converted into from a certain zero-time α to come the traffic frame number A of current time;
By test, obtain the maximum delay of system when sending the forward business frame, with the number B of its conversion framing;
A is carried out delivery with 2 * B, calculate the frame number C of this traffic frame, and this frame number C is deposited in the frame head of traffic frame, send this frame to base station transceiver;
Base station transceiver obtains system time after receiving this frame, and this system time is converted into the traffic frame number D of same zero-time α to the current time;
D with 2 * B delivery, is calculated the frame number E of expectation;
The frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, determine whether that this traffic frame write chip or abandon or write buffer area with etc. to be sent.
3. method as claimed in claim 2 is characterized in that, described system time is the pilot signal that sends by travelling carriage demodulation BSC, obtains with short pseudo-code phase information in acquisition base station and demodulation synchronizing channel.
4. method as claimed in claim 2, it is characterized in that, in the step that the frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E=C, show that the forward business frame arrives on time, then it is write chip and send to travelling carriage.
5. as claim 2 or 3 described methods, it is characterized in that, in the step that the frame number E of the frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E＞C and E-C≤B, show that this forward business frame comes late, then it is abandoned;
6. as claim 2 or 3 described methods, it is characterized in that, in the step that the frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E＞C and E-C＞B, shown that this forward business frame has come early, the buffer area etc. of then this frame being put into corresponding frame number is to be sent.
7. as claim 2 or 3 described methods, it is characterized in that, in the step that the frame number E of the frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E＜C and C-E 〉=B, show that this forward business frame comes late, then it is abandoned.
8. as the method for claim 2 or 3 described traffic frame time unifyings, it is characterized in that, in the step that the frame number E of frame number C in the traffic frame frame head that base station transceiver is received and the expectation that calculates compares, when E＜C and C-E＜B, shown that this forward business frame has come early, the buffer area etc. of then this frame being put into corresponding frame number is to be sent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031396151A CN100486388C (en) | 2003-06-23 | 2003-06-23 | A method for improving air signal transmission quality of CDMA system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031396151A CN100486388C (en) | 2003-06-23 | 2003-06-23 | A method for improving air signal transmission quality of CDMA system |
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| CN1567781A true CN1567781A (en) | 2005-01-19 |
| CN100486388C CN100486388C (en) | 2009-05-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090563B (en) * | 2006-06-15 | 2010-07-14 | 中兴通讯股份有限公司 | Method for sequence number alignment of soft switchover forward frame of CDMA radio communication system |
| CN102368823A (en) * | 2011-06-28 | 2012-03-07 | 上海盈方微电子有限公司 | Video framedropping strategy based on grading mechanism |
| CN101778014B (en) * | 2010-01-12 | 2012-04-04 | 华为技术有限公司 | Method and device for analyzing service quality deterioration |
| CN103532681A (en) * | 2012-07-05 | 2014-01-22 | 上海无线电设备研究所 | Cooperative measurement system response-type bidirectional data communication method |
| CN106850331A (en) * | 2016-12-12 | 2017-06-13 | 清华大学 | A kind of Ethernet with synchronised clock function hair frame device of field of traffic |
-
2003
- 2003-06-23 CN CNB031396151A patent/CN100486388C/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090563B (en) * | 2006-06-15 | 2010-07-14 | 中兴通讯股份有限公司 | Method for sequence number alignment of soft switchover forward frame of CDMA radio communication system |
| CN101778014B (en) * | 2010-01-12 | 2012-04-04 | 华为技术有限公司 | Method and device for analyzing service quality deterioration |
| CN102368823A (en) * | 2011-06-28 | 2012-03-07 | 上海盈方微电子有限公司 | Video framedropping strategy based on grading mechanism |
| CN103532681A (en) * | 2012-07-05 | 2014-01-22 | 上海无线电设备研究所 | Cooperative measurement system response-type bidirectional data communication method |
| CN103532681B (en) * | 2012-07-05 | 2018-03-23 | 上海无线电设备研究所 | Cooperation measurement systems response formula bidirectional data communication method |
| CN106850331A (en) * | 2016-12-12 | 2017-06-13 | 清华大学 | A kind of Ethernet with synchronised clock function hair frame device of field of traffic |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100486388C (en) | 2009-05-06 |
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Granted publication date: 20090506 |