CN102802226B - The system and method for terminal timing is adjusted during the switching of radio-frequency channel - Google Patents
The system and method for terminal timing is adjusted during the switching of radio-frequency channel Download PDFInfo
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- CN102802226B CN102802226B CN201110137910.0A CN201110137910A CN102802226B CN 102802226 B CN102802226 B CN 102802226B CN 201110137910 A CN201110137910 A CN 201110137910A CN 102802226 B CN102802226 B CN 102802226B
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Abstract
The present invention adjusts the system and method for terminal timing when proposing the switching of a kind of radio-frequency channel, the method comprises the following steps: ignore radio-frequency channel delay variation, calculates radio-frequency channel switching time；Detect whether radio-frequency channel switching；When detecting that radio-frequency channel switches, the delay parameter of radio-frequency channel after obtaining the delay parameter switching front radio-frequency channel respectively and switching；Calculate the radio-frequency channel delay variation that switching is forward and backward；And adjust this radio-frequency channel switching time according to this radio-frequency channel delay variation。The present invention can overcome existing scheme to be left out channel time delay difference to cause bad timing, thus the problem causing hydraulic performance decline。
Description
Technical field
The present invention relates to a kind of communication terminal, when especially relating to the switching of a kind of radio-frequency channel, adjust the system and method for terminal timing。
Background technology
3GPP will start Long Term Evolution (LTE) plan of UMTS (UMTS) technology in the end of the year 2004。This plan introduces brand-new wireless air interface and the technology of various advanced person so that the transfer rate that LTE system support is bigger, less access delay and bigger power system capacity。
Along with the mobile communication increase to spectrum requirement, suitable frequency spectrum resource is more and more precious, but along with the development of technology, some traditional technology can be eliminated, and its shared frequency spectrum also can discharge gradually, here it is " frequency spectrum bonus "。In order to utilize " frequency spectrum bonus ", it is desirable to LTE system can the various bandwidth of support of flexibility and changeability。LTE uses OFDMA/SC-FDMA (OFDM/Single Carrier-Frequency Division multiple access) technology, by the sub-carrier number supported, namely the adjustment that fast fourier transform/fast Flourier inverse transformation (FFT/IFFT) is counted, it is possible to it is easy to support various system bandwidth。Current LTE supports 1.4MHz, 3MHz, 5MHz, the various system bandwidth such as 10MHz, 15MHz and 20MHz。
LTE is a standard based on full packet, and all business all realize in packet switch (PS) territory, it is possible to better support the mobile Internet business quickly grown。Packet Service has an important feature: up-downgoing portfolio is asymmetric。Owing to traditional FDD up-downgoing is to be distinguished by different frequencies, the bandwidth of general up-downgoing is identical, therefore traditional FDD system support existing defects to Packet Service, in order to solve this problem, LTEFDD system definition upstream and downstream bandwidth can be respectively configured, and namely supports that up-downgoing uses different bandwidth。
The peculiar design of above-mentioned LTE makes LTE terminal operationally, there is the demand of switching radio frequency bandwidth。Such as, when switching in LTE terminal community or face region measurement, owing to bandwidth of cell is different, it may be necessary to change radio frequency bandwidth；When carrying out up-downgoing switching, owing to upstream and downstream bandwidth is different, it is also possible to there is the demand changing radio frequency bandwidth。
In general wireless communication system, signal is when sending and receive, it is necessary to through sending radio-frequency channel or receiving RF channel。Radio-frequency channel on ordinary meaning includes RF and ABB two parts, it is achieved the functions such as filtering, radio frequency frequency conversion, power/amplitude amplification, modulus/digital-to-analogue conversion。There is propagation delay time in RF/ABB, and the process of the signal of different bandwidth process in RF/ABB path differing, this can cause that the reception/transmitting signal of different bandwidth produces different time delays in the RF/ABB stage。
Radio-frequency channel time delay is generally microsecond (us) magnitude。Such as, a typical RF/ABB passage, the possible time delay under different bandwidth is as shown in table 1 below。
Table 1
If it is considered that intersystem handover, the bandwidth of different communication systems is also discrepant, and the delay variation of its RF/ABB passage is even bigger。Such as, the system bandwidth of TD-SCDMA is 1.6MHz, and the system bandwidth being switched to LTE is likely 20MHz, widely different, and TD-SCDMA signal is relatively big to the requirement difference of wave filter to requirement and the LTE signal of wave filter, its radio-frequency channel time delay difference is likely to become apparent from。
Current terminal, when processing, is substantially left out the time delay of radio-frequency channel, or thinks that channel time delay is identical when different directions (uplink and downlink) and different system bandwidths, do not carry out special handling when switching in radio-frequency channel。
The system bandwidth of 2G or 3G is relatively small, and its sample rate is relatively low。Such as, the single-time sampling rate of the WCDMA system in 3G system is 3.84MHz, and the single-time sampling rate of TD-SCDMA system is 1.28MHz；And 2G communication system, for instance, the single-time sampling rate of gsm system is lower, for 200KHz magnitude。Sample rate is low means that the sampling period is long, it can be seen that the sampling period of 2G or 3G all with the time delay of radio-frequency channel quite even much larger than the time delay of radio-frequency channel, therefore the impact of 2G or 3G system not quite maybe can be ignored by radio-frequency channel time delay。
But owing to LTE system supports more high bandwidth, single-time sampling rate is even as high as 30.72MHz (during the configuration of 20MHz system bandwidth), its sampling period has shortened to about 0.03us, much smaller than typical radio-frequency channel time delay, now radio-frequency channel time delay receives for signal and sends and cannot ignore。Such as, receiving two kinds of configurations for 1.4MHz and 10MHz, calculate with the sampling period, its channel time delay difference is even more than 50 sampled points。It will be appreciated by those skilled in the art that, if being now still left out the time delay of radio-frequency channel and the delay variation of different configuration of radio-frequency channel, terminal there will be, in the occasion of the radio-frequency channel switchings such as up-downgoing switching or system bandwidth switching, the situation that timing is shaken suddenly, thus causing the Quality Down of signal transmission or data receiver。
Showing example with Fig. 1, dash area receives data for expectation, it is assumed that sending and reception is that holding wire is direct-connected, time delay is only contributed by radio-frequency channel。In the T0 moment, transmitting terminal starts to send expectation and receives data。
If terminal initial uses 1.4MHz bandwidth to receive, then RF/ABB exported in T0+ τ 1 moment, just can receive expectation and receive data。It is to say, when 1.4MHz bandwidth receives, terminal can by its timing adjustment when delayed τ 1 of real delivery time。Wherein, radio-frequency channel time delay when τ 1 receives for 1.4MHz bandwidth。
Now, if terminal is operate under 1.4MHz reception bandwidth starting before receiving expected data, and receive when expectation receives data and need to be operated in 10MHz bandwidth, if now RF/ABB remains in the output of T0+ τ 1 moment, then the data exported are delayed to some extent (delayed τ 1-τ 2)。Wherein, radio-frequency channel time delay when τ 2 receives for 10MHz bandwidth。
Summary of the invention
The invention provides a kind of system and method adjusting terminal timing when switching in radio-frequency channel, the difference of radio frequency channel time delay can compensate when radio-frequency channel switches and ensure the accuracy of timing, thus ensureing to receive and launch the quality of signal。
The present invention solves the method that above-mentioned technical problem adjusts terminal timing when employed technical scheme comprise that and propose the switching of a kind of radio-frequency channel, comprise the following steps: ignore radio-frequency channel delay variation, calculate radio-frequency channel switching time；Detect whether radio-frequency channel switching；When detecting that radio-frequency channel switches, the delay parameter of radio-frequency channel after obtaining the delay parameter switching front radio-frequency channel respectively and switching；Calculate the radio-frequency channel delay variation that switching is forward and backward；And adjust this radio-frequency channel switching time according to this radio-frequency channel delay variation。
In one embodiment of this invention, detect whether that the step that radio-frequency channel switching occurs includes: changed by detection bandwidth and judge whether radio-frequency channel switching。
In one embodiment of this invention, detect whether that the step that radio-frequency channel switching occurs includes: judge whether radio-frequency channel switching by inspection center's frequency change。
In one embodiment of this invention, detect whether that the step that radio-frequency channel switching occurs includes: judge whether radio-frequency channel switching by up-downlink direction。
In one embodiment of this invention, this delay parameter includes the absolute time delay of radio-frequency channel, or radio-frequency channel is relative to the relative time delay of a reference time delay。
The present invention adjusts the system of terminal timing when separately proposing the switching of a kind of radio-frequency channel, including radio-frequency channel module and switching control module。Radio-frequency channel module is for performing reception and the transmission of rf data。Switching control module, farther includes radio-frequency channel switching judging module, delay variation computing module and timing control module。Radio-frequency channel switching judging module is used for judging whether to be about to radio-frequency channel switching, when detecting that radio-frequency channel switches, and output one switching notification signal。When receiving this switching notice signal, delay variation computing module, according to switching forward and backward radio-frequency channel delay parameter, calculates and exports radio-frequency channel delay variation。Timing control module receives this radio-frequency channel delay variation the radio-frequency channel on-off control moment calculated when ignoring radio-frequency channel delay variation according to radio-frequency channel delay variation adjustment。
In one embodiment of this invention, said system also includes a radio-frequency channel delay parameter memory module, for storing the delay parameter corresponding to radio-frequency channel under various configuration。
In one embodiment of this invention, this delay parameter includes the absolute time delay of radio-frequency channel, or radio-frequency channel is relative to the relative time delay of a common parameter。
In one embodiment of this invention, this radio-frequency channel switching judging module is changed by detection bandwidth and judges whether the switching of generation radio-frequency channel。
In one embodiment of this invention, this radio-frequency channel switching judging module judges whether radio-frequency channel switching by inspection center's frequency change。
In one embodiment of this invention, this radio-frequency channel switching judging module judges whether radio-frequency channel switching by up-downlink direction。
Due to the fact that the above technical scheme of employing, so as to compared with prior art, the radio-frequency channel delay variation that switching is forward and backward is calculated by detecting radio-frequency channel switching, and radio-frequency channel delay variation is introduced when the radio-frequency channel on-off control moment, timing more accurately can be obtained, it is provided that terminal system performance。
Accompanying drawing explanation
For the 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 that the output data caused due to radio-frequency channel time delay conversion when radio-frequency channel switches in prior art are delayed。
Fig. 2 illustrates the system structure of the adjustment terminal timing of one embodiment of the invention。
Fig. 3 illustrates the method flow of the adjustment terminal timing of one embodiment of the invention。
Detailed description of the invention
Fig. 2 illustrates the system structure of the adjustment terminal timing of one embodiment of the invention。With reference to shown in Fig. 2, the system 100 adjusting terminal timing comprises switching control module 110 and radio-frequency channel module 120。
Switching control module 110 comprises radio-frequency channel switching judging module 112, delay variation computing module 114, radio-frequency channel delay parameter memory module 116 and timing control module 118 further。
Radio-frequency channel module 120 is used for reception and the transmission of rf data, it is achieved the mutual conversion of digital baseband data and rf data。This radio-frequency channel module 120 provides an input interface, for controlling the time that radio-frequency channel module 120 opens and closes。The timing of transmitting-receiving can be passed through to adjust the Enable signal inputing to this interface and realize。Radio-frequency channel module 120 is known to the skilled person technology, is not described in detail herein。
Switching control module 110, according to the radio-frequency channel delay parameter obtained in advance, adjusts timing controlled in radio-frequency channel when switching, output controls the open/close signal in radio-frequency channel。Acquired radio-frequency channel delay parameter is saved in radio-frequency channel delay parameter memory module 116。Specifically, the delay parameter assuming terminal radio-frequency channel before the handover is τ 1, after switching, the delay parameter of radio-frequency channel is τ 2, when then switching in radio-frequency channel, switching control module controls the output time of radio-frequency channel switching signal, being left out on the basis of radio-frequency channel time delay, the extra τ 1-τ 2 that shifts to an earlier date again (if τ 1-τ 2 is 0, does not then additionally adjust；If τ 1-τ 2 is negative value, then extra delayed again | τ 1-τ 2 |)。
At this, delay parameter can be absolute time delay, i.e. the absolute time of the delay that radio-frequency channel produces。Delay parameter is alternatively relative time delay, and namely each radio-frequency channel is designated as the relative time of the delay produced by reference channel with reference to time delay relative to one。
The workflow of switching control module is further described separately below in conjunction with each comprising modules of switching control module。
Radio-frequency channel switching judging module 112 is used for judging whether to be about to radio-frequency channel switching。Such as, radio-frequency channel switching judging module 112 can be changed by detection bandwidth and judge whether the switching of generation radio-frequency channel。For another example, radio-frequency channel switching judging module 112 can judge whether to occur radio-frequency channel switching by inspection center's frequency change, and center frequency point change often means that intersystem handover, for instance the switching from TD-SCDMA to LTE。And for example, radio-frequency channel switching judging module 112 can judge whether radio-frequency channel switching by up-downlink direction。
If there occurs that radio-frequency channel switches, then radio-frequency channel switching judging module 112 output switching notification signal is to delay variation computing module 114。The switching of radio-frequency channel may include but be not limited to: same direction (is all up or is all descending), the conversion of the radio-frequency channel of different bandwidth；The switching of the radio-frequency channel between different communication systems；The conversion of the radio-frequency channel of different directions；And other any radio-frequency channel switchings that can affect channel time delay。
Delay variation computing module 114 is when receiving switching notice signal, the delay parameter of switching both front and back radio-frequency channel is read (assuming that be τ 1 before adjusting from radio-frequency channel delay parameter memory module 116, it is τ 2 after adjustment), calculate its difference (τ 1-τ 2), and the delay variation that radio-frequency channel switching causes is exported to timing control module 118。
Radio-frequency channel delay parameter memory module 116 is for storing the delay parameter corresponding to radio-frequency channel under various configuration。In the various embodiments of the invention, these delay parameters can obtain according to device property, it is also possible to is obtained by the production test of terminal。As it was previously stated, these delay parameters can be absolute time delay, it is possible to for relative time delay。
Timing control module 118 is generally in advance based on supposing that the premise of radio-frequency channel time delay identical (namely ignoring the delay variation of radio-frequency channel) calculates radio-frequency channel on-off control moment T0。When receiving the delay variation caused by radio-frequency channel switching from delay variation computing module 114, timing control module 118, the adjustment radio-frequency channel on-off control moment is T0-(τ 1-τ 2)。
In one embodiment of this invention, the entirely or essentially part of switching control module 110 can realize in the radio frequency control module of terminal physical layer。Radio frequency control module can through the program configuration function to realize switching control module 110, for instance radio-frequency channel switching judging, delay variation calculates, timing controlled etc.。
As the embodiment replaced, the entirely or essentially part of switching control module 110 can be realized in the terminal with hardware circuits such as one or more special ICs (ASIC), PLD (PLD), processors。
Fig. 3 illustrates the method flow of the adjustment terminal timing of one embodiment of the invention。With reference to shown in Fig. 3, the flow process of a preferred embodiment of the present invention comprises the following steps。
First such as step S1, ignore radio-frequency channel delay variation, calculate radio-frequency channel switching time T0。
Then in step S2, it may be judged whether radio-frequency channel switching will occur。
Such as can be changed by detection bandwidth in step s 2 and judge whether radio-frequency channel switching。For another example, it is possible to judging whether to occur radio-frequency channel switching by inspection center's frequency change, center frequency point change often means that intersystem handover, for instance the switching from TD-SCDMA to LTE。And for example, it is possible to judge whether radio-frequency channel switching by up-downlink direction。
If it occur that radio-frequency channel switching, then in step S3, obtain the radio-frequency channel delay parameter τ 1 before and after switching and τ 2 respectively；Otherwise process ends。
And then the step S4 of step S3, calculates the radio-frequency channel delay variation τ 1-τ 2 before and after switching。
Finally such as step S5, adjusting radio-frequency channel switching time is T0-(τ 1-τ 2)。
Method described by the present embodiment both can realize in aforesaid terminal system structure, it would however also be possible to employ other any can structure realize, be not specifically limited at this。
The system and method for the adjustment terminal timing described by above example of the present invention, can when radio-frequency channel switches, discrepancy adjustment terminal timing according to channel time delay, is left out channel time delay difference causes bad timing thus overcoming existing scheme, thus the problem causing hydraulic performance decline。
Although the present invention discloses as above with preferred embodiment; so it is not limited to 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 with being as the criterion that claims define。
Claims (11)
1. the method adjusting terminal timing during the switching of radio-frequency channel, comprises the following steps:
Ignore radio-frequency channel delay variation, calculate radio-frequency channel switching time T0；
Detect whether radio-frequency channel switching；
When detecting that radio-frequency channel switches, the delay parameter τ 2 of radio-frequency channel after obtaining the delay parameter τ 1 switching front radio-frequency channel respectively and switching；
Calculate the radio-frequency channel delay variation τ 1-τ 2 that switching is forward and backward；And
Adjusting this radio-frequency channel switching time according to this radio-frequency channel delay variation is T0-(τ 1-τ 2)。
2. the method for claim 1, it is characterised in that detect whether that the step that radio-frequency channel switching occurs includes: changed by detection bandwidth and judge whether radio-frequency channel switching。
3. the method for claim 1, it is characterised in that detect whether that the step that radio-frequency channel switching occurs includes: judge whether radio-frequency channel switching by inspection center's frequency change。
4. the method for claim 1, it is characterised in that detect whether that the step that radio-frequency channel switching occurs includes: judge whether radio-frequency channel switching by up-downlink direction。
5. the method for claim 1, it is characterised in that this delay parameter includes the absolute time delay of radio-frequency channel, or radio-frequency channel is relative to the relative time delay of a reference time delay。
6. during the switching of radio-frequency channel, adjust a system for terminal timing, including:
Radio-frequency channel module, for performing reception and the transmission of rf data；And
Switching control module, comprising:
Radio-frequency channel switching judging module, is used for judging whether to be about to radio-frequency channel switching, when detecting that radio-frequency channel switches, and output one switching notification signal；
Delay variation computing module, when receiving this switching notice signal, according to radio-frequency channel delay parameter τ 1, τ 2 that switching is forward and backward, calculates and exports radio-frequency channel delay variation τ 1-τ 2；And
Timing control module, receives this radio-frequency channel delay variation, and the radio-frequency channel on-off control moment T0 calculated when ignoring radio-frequency channel delay variation according to radio-frequency channel delay variation adjustment is T0-(τ 1-τ 2)。
7. system as claimed in claim 6, it is characterised in that also include a radio-frequency channel delay parameter memory module, for storing the delay parameter corresponding to radio-frequency channel under various configuration。
8. system as claimed in claim 7, it is characterised in that this delay parameter includes the absolute time delay of radio-frequency channel, or radio-frequency channel is relative to the relative time delay of a common parameter。
9. system as claimed in claim 6, it is characterised in that this radio-frequency channel switching judging module is changed by detection bandwidth and judges whether radio-frequency channel switching。
10. system as claimed in claim 6, it is characterised in that this radio-frequency channel switching judging module judges whether radio-frequency channel switching by inspection center's frequency change。
11. system as claimed in claim 6, it is characterised in that this radio-frequency channel switching judging module judges whether radio-frequency channel switching by up-downlink direction。
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| CN106357356B (en) * | 2015-07-17 | 2018-10-12 | 普天信息技术有限公司 | A kind of frequency spectrum sensing method and system based on grouping spectrum pool |
| CN106454972B (en) * | 2015-08-10 | 2020-04-10 | 中国移动通信集团公司 | Method and device for switching signals between same physical frequency points and different frequency point numbers |
| CN105119775A (en) * | 2015-08-28 | 2015-12-02 | 国电南瑞科技股份有限公司 | Method for improving accuracy of Ethernet message transmission delay measurement |
| CN113453323B (en) * | 2020-03-27 | 2022-11-29 | 大唐移动通信设备有限公司 | Power consumption control method and device, electronic equipment and storage medium |
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| CN101043254A (en) * | 2006-03-24 | 2007-09-26 | 大唐移动通信设备有限公司 | Method for processing terminal to transmit uplink signal |
| CN101237272A (en) * | 2007-02-02 | 2008-08-06 | 中兴通讯股份有限公司 | RF channel synchronization system and method |
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| CN101043254A (en) * | 2006-03-24 | 2007-09-26 | 大唐移动通信设备有限公司 | Method for processing terminal to transmit uplink signal |
| CN101237272A (en) * | 2007-02-02 | 2008-08-06 | 中兴通讯股份有限公司 | RF channel synchronization system and method |
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