CN101312368A - Method and apparatus detecting no signal sub-frame - Google Patents
Method and apparatus detecting no signal sub-frame Download PDFInfo
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- CN101312368A CN101312368A CNA2007101076991A CN200710107699A CN101312368A CN 101312368 A CN101312368 A CN 101312368A CN A2007101076991 A CNA2007101076991 A CN A2007101076991A CN 200710107699 A CN200710107699 A CN 200710107699A CN 101312368 A CN101312368 A CN 101312368A
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Abstract
The invention discloses a method for detecting non-signal subframes, which is applied to the process of discontinuous transmission and comprises steps of setting threshold value, calculating signal power of the subframe, and comparing the signal power and the threshold value to determine the subframe as a non-signal subframe when the signal power is less than or equal to the threshold value. The threshold value can be set to detect the noise power of the subframe, the detected noise power after being added with an offset is taken as the threshold value, the signal power of the subframe can be calculated to estimate the channel impulse response of the subframe, the power of each path of the signal can be calculated from the channel impulse response, and the signal power of the subframe can be obtained after summing and averaging the signal powers of each path. The invention further discloses a device for detecting non-signal subframes. By utilizing the method and the device, a receiving end can determine whether the received subframe is a non-signal subframe or not, thereby refusing the execution of commands of transmission power control and synchronous offset in the non-signal subframe, and guaranteeing the correctness of the transmission power and the synchronous offset during the discontinuous transmission.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of method and apparatus that detects no signal sub-frame.
Background technology
In the wireless communication system, the interference that reduces interchannel is important means that realize improving power system capacity.According to statistics, usually, the people approximately has only 40% time sounding in communication process, at these characteristics, existing wireless communication system adopts discontinuous emission (Discontinuous Transmission, DTX) technology, be specially: between the quiet period of communication process, transmitter does not need to send data, at this moment, the transmitting power of transmitter is reduced to extremely low limit, even with Transmitter Turn-Off, can reduce transmitting power significantly like this, and then reduce the interference of interchannel, improve power system capacity; In addition, owing to reduced the transmitting power of transmitter, can also reach the purpose of economize on electricity.Certainly, DTX also can be applied in the transmission of data service and obtain effect same.
Below (Time Division-Synchronous Code Division MultipleAccess, TD-SCDMA) system is the example explanation with synchronous code division multiple access of time-division.In the TD-SCDMA system, signal is aloft propagated with the form of radio frames, and Fig. 1 shows the structure of radio frames and burst.As shown in the figure, a radio frames is divided into two subframes (sub-frame), three special time slots are arranged in each subframe, and (Time Slot TS) arrives seven conventional time slots of TS6 with TS0, and transmitter sends the form of signal with burst (Burst) on certain time slot.And, as shown in the figure, can comprise in the burst transmitting power control (Transmission Power Control, TPC) and simultaneous bias (Synchronization Shift, SS) order, receiving terminal carries out transmitting power control and simultaneous bias control according to these orders.One skilled in the art will appreciate that and realize that transmitting power and synchronous correctly being controlled at are the most basic in the wireless system, also is crucial requirement.
Transmitting terminal in up/descending DTX process, promptly user terminal (User Equipment, UE)/base station (NodeB) in, transmitter periodically sends special burst (Special Burst) to receiving terminal, is the DTX process to represent this process.Between two adjacent Special Burst, transmitter does not send signal.Here, each subframe that transmitter is not sent signal calls no signal sub-frame (no-signal-sub-frame).
Because in the DTX process, transmitter does not send signal between two adjacent special bursts, therefore, at receiving terminal, receiver need detect the signal that receives during the DTX, determines transmitter has sent signal in which subframe, and which subframe does not send signal.
But receiving terminal receives after the signal of each subframe at present, does not judge the mechanism of no signal sub-frame.If in the DTX process, still the signal that each subframe is not received carries out the judgement of no signal sub-frame, will cause and extract wrong TPC/SS order from no signal sub-frame, and carry out the situation of the TPC/SS order of the mistake of extracting like this.The result of the TPC/SS of receiving terminal execution error order can cause power, synchronous etc. making a mistake, and then influence speech quality, even causes conversation to be failed.
Summary of the invention
The purpose of this invention is to provide a kind of method and apparatus that detects no signal sub-frame, in the DTX process, need the problem that the no signal sub-frame that receives is detected with solution.
For solving the problems of the technologies described above, the invention provides a kind of method and apparatus that detects no signal sub-frame and be achieved in that
A kind of method that detects no signal sub-frame comprises:
Threshold value is set; Calculate the signal power of this subframe;
Comparison signal power and threshold value when signal power is less than or equal to threshold value, judge that this subframe is a no signal sub-frame.
The described threshold value that is provided with is realized by following mode:
Detect the noise power of this subframe;
Detected noise power is increased behind the bias as threshold value.
Described bias can rule of thumb be redefined for one greater than 0 value.
The signal power of described this subframe of calculating is realized by following mode:
Estimate the channel impulse response of this subframe, and obtain the signal power of this subframe according to this channel impulse response.
Channel impulse response of described this subframe of estimation and the signal power that obtains this subframe according to this channel impulse response are realized by following mode:
Estimate on the every antenna channel impulse response by the received signal of every antenna from transmitted from transmitter to receiver;
Send the received power of signal according to following formula transmitter computes by the channel impulse response on the every antenna of estimating:
Wherein, k is a day wire size, and K is the sum of reception antenna, and n represents n footpath in the channel impulse response, N represents total footpath number in the channel impulse response window, (k is the channel impulse response in n footpath in the k root antenna upper signal channel impulse response window n) to h, is plural number, || h (k, n) || for this channel impulse response is done modulo operation, || h (k, n) ||
2Be the power of n footpath channel impulse response in the k root antenna upper signal channel impulse response window.
Described comparison signal power and threshold value also comprise:
When signal power greater than threshold value, judge that then this subframe is special burst sub-frame or data burst.
Ignore this subframe described further comprising when this subframe of judgement is no signal sub-frame.
A kind of device that detects no signal sub-frame comprises the signal power computing unit, and threshold value is provided with unit and subframe judging unit, wherein,
The signal power computing unit is used to calculate the signal power of this subframe;
Threshold value is provided with the unit and is used to be provided with threshold value;
The subframe judging unit is used for more described signal power and threshold value, judges that when signal power is less than or equal to threshold value this subframe is a no signal sub-frame.
Described signal power computing unit comprises channel impulse response estimation unit and signal power sum-average arithmetic unit, wherein,
The channel impulse response estimation unit is used to estimate the channel impulse response on the every antenna;
Channel impulse response on the every antenna that signal power sum-average arithmetic unit is used for being estimated by the channel impulse response estimation unit is tried to achieve the power of every footpath signal, and the signal power in every footpath on the every antenna is carried out obtaining after sum-average arithmetic calculates the signal power of this subframe.
Described threshold value is provided with the unit and comprises the noise power detecting unit and increase bias unit, wherein,
The noise power detecting unit is used to detect the noise power of this subframe;
Increasing bias unit is used for the detected noise power of noise power detecting unit is increased after the biasing as threshold value.
Described subframe judging unit also is used for more described signal power and threshold value, when signal power judges that this subframe is special burst sub-frame or data burst during greater than threshold value.
Described device also comprises the subframe processing unit, is used for ignoring this no signal sub-frame when subframe judgment unit judges subframe is no signal sub-frame.
By above technical scheme provided by the invention as seen, the present invention detects the noise power of this subframe, and threshold value is set according to this noise power, estimate the channel impulse response of this subframe, and calculate signal power according to this channel impulse response, afterwards, signal power that relatively obtains and threshold value, when signal power judges that this subframe is a no signal sub-frame during smaller or equal to threshold value, like this, receiving terminal can know that whether the subframe that receives is no signal sub-frame, and then can ignore this no signal sub-frame, promptly do not carry out the TPC/SS order in this no signal sub-frame, thereby guaranteed the correctness that through-put power is controlled and simultaneous bias is controlled in the DTX process.
Description of drawings
Fig. 1 is frame, subframe, burst schematic diagram;
Fig. 2 is the flow chart of the inventive method embodiment;
Fig. 3 is the structure chart of apparatus of the present invention embodiment.
Embodiment
Core of the present invention provides a kind of method and apparatus that detects no signal sub-frame, detect the noise power of this subframe, and threshold value is set according to this noise power, estimate the channel impulse response of this subframe, and calculate signal power according to this channel impulse response, afterwards, signal power that relatively obtains and threshold value, when signal power judges that this subframe is a no signal sub-frame during smaller or equal to threshold value, otherwise, when signal power judges that this subframe is special burst sub-frame or data burst during greater than threshold value.Particularly, can be set to threshold value after the biasing of noise power increase with detected subframe; Can try to achieve the power of every footpath signal by the channel impulse response on the every antenna of channel impulse response estimation unit estimation, and the signal power in every footpath on the every antenna be carried out obtaining after sum-average arithmetic calculates the signal power of this subframe.
In order to make those skilled in the art better understand the solution of the present invention, below be example with TD-SCDMA, the present invention is described in further detail with embodiment in conjunction with the accompanying drawings.
Those skilled in the art will know that, regulation and stipulation among the existing TD-SCDMA, in the DTX process, on the no matter up still down direction, transmitting terminal (that corresponding is UE and NodeB) is at first launched Special Burst frame to receiving terminal (that corresponding is NodeB and UE), and wherein, each Special Burst frame comprises two Specail Burst subframes, after receiving terminal is received first SpecialBurst frame, think that up/descending DTX begins.Afterwards, transmitting terminal is closed transmitter.Behind the certain hour, transmitting terminal is opened transmitter, sends Special Burst frame once more, and transmitting terminal is closed transmitter subsequently.During the DTX, transmitting terminal comes to this and sends Special Bursts frame at interval according to some cycles.The TPC/SS order of transmitting terminal in the Special Burst frame of certain cycle transmission is only the correct order that receiving terminal should receive.And receiving terminal receives each subframe always in whole DTX process, when what receive is not Special Burst subframe, but during no signal sub-frame, still from no signal sub-frame, extract the TPC/SS order according to normal data handling procedure and carry out, therefore caused aforesaid technical problem.
Below introduce the specific embodiment of the inventive method.
Fig. 2 shows the flow process of the inventive method embodiment.
Step 201: detect the noise power of this subframe, and detected noise power is increased after the biasing as threshold value.
One skilled in the art will appreciate that detection to this subframe noise power is a mature technique comparatively in the prior art, for example can adopt empty window (empty-window) technology or other technology that is fit to, do not repeat them here.
A biasing can be set, with after detected noise power and this biasing addition as threshold value.This bias should be one greater than 0 value, its size can be used as an Operation and Maintenance (Operation ﹠amp; Maintenance, O﹠amp; M) parameter rule of thumb preestablishes.For example, bias can be set be 3dB (following all represent), detected noise power is increased behind the 3dB as threshold value (Threshold) with dB.
Step 202: estimate the channel impulse response of this subframe, and calculate the signal power of this subframe according to this channel impulse response.
One skilled in the art will appreciate that (Channel Impulse Response, estimation CIR) also is a mature technique comparatively in the prior art, does not therefore repeat them here to channel impulse response.
Receiving terminal possibility one total K antenna, each antenna can both receive the signal that transmitting terminal sends.Because the multipath effect of wireless channel, the superposition of the signal that receives on the every antenna multipath signal that all to be the signal that sends of transmitting terminal obtain through multipath transmisstion.Receiving terminal will be estimated to obtain the impulse response of the wireless channel from transmitting terminal to this antenna respectively by the received signal on each antenna.As previously mentioned, the impulse response of every antenna upper signal channel is estimated as prior art.Afterwards, obtain the signal power of this subframe by the channel impulse response on this K antenna.
The computational methods of the signal power SignalPower of this subframe are:
Wherein, be numbered channel impulse response on the footpath of n on k antenna and be h (k, n), h (k n) is plural number, therefore need carry out modulo operation to it, promptly in the formula || h (k, n) ||, || h (k, n) ||
2Be the power of n footpath channel impulse response in the k root antenna upper signal channel impulse response window.N represents total footpath number in the channel impulse response window.
Each footpath in time be spaced apart Tc=1chip=1/ (1280000)=0.78125us.
As seen, try to achieve the power of every footpath signal, and the signal power in every footpath on the every antenna is carried out obtaining after sum-average arithmetic calculates the signal power of this subframe by the channel impulse response on the every antenna of channel impulse response estimation unit estimation.
Like this, just obtained the signal power of this subframe.
Step 203: signal power that relatively obtains and threshold value, when signal power is less than or equal to threshold value, judge that then this subframe is a no signal sub-frame.
Otherwise, when signal power greater than threshold value, judge that then this subframe is Special Burst subframe or data burst.
Further, receiving terminal is judged when the subframe that obtains is no signal sub-frame, ignores this subframe, promptly this subframe is not carried out conventional treatment, does not promptly extract TPC/SS order wherein, and then does not carry out through-put power and Synchronization Control.
There is not fixing sequencing between the above-mentioned steps 201 and 202, also can first signal calculated power, back calculating noise power.
If threshold value is provided with too highly, then Special Burst subframe and data burst can be lost, and the TPC/SS order of carrying in these subframes is lost, and cause system power control and Synchronization Control decreased performance.If threshold value is provided with lowly excessively, then can cause false-alarm, promptly no signal sub-frame is treated as SB and data burst, and then can make the wrong TPC/SS order of receiver response, therefore, the reasonable setting of threshold value is related to raising detection probability, reduction false alarm probability.
Below introduce the specific embodiment of apparatus of the present invention.
Fig. 3 shows the structure chart of apparatus of the present invention embodiment.
As shown in the figure, device provided by the invention comprises signal power computing unit 31, and threshold value is provided with unit 32 and subframe judging unit 33, wherein,
Signal power computing unit 31 links to each other with subframe judging unit 33, is used to calculate the signal power of this subframe.
Signal power computing unit 31 comprises channel impulse response estimation unit 311 and signal power sum-average arithmetic unit 312, wherein,
Channel impulse response estimation unit 311 links to each other with signal power sum-average arithmetic unit 312, be used to estimate the channel impulse response from transmitting terminal to this antenna on the every antenna, and described estimated channel impulse response value is sent to signal power sum-average arithmetic unit 312.
Signal power sum-average arithmetic unit 312 links to each other with channel impulse response estimation unit 311, try to achieve the power of every footpath signal by the channel impulse response on the every antenna of channel impulse response estimation unit estimation, and the signal power in every footpath on the every antenna carried out obtaining after sum-average arithmetic calculates the signal power of this subframe, and this signal power is sent to subframe judging unit 33.
Threshold value is provided with unit 32 and links to each other with subframe judging unit 33, is used to be provided with threshold value.
Threshold value is provided with unit 32 and comprises noise power detecting unit 321 and increase bias unit 322, wherein,
Noise power detecting unit 321 is used to detect the noise power of this subframe, and this noise power is sent to increase bias unit 322.
Increasing noise power that bias unit 322 is used for receiving increases after the biasing as threshold value, and this threshold value is sent to subframe judging unit 33.
Signal power that subframe judging unit 33 is used for relatively receiving and threshold value judge that when signal power is less than or equal to threshold value this subframe is a no signal sub-frame.
Subframe judging unit 33 also is used for more described signal power and threshold value, when signal power judges that this subframe is special burst sub-frame or data burst during greater than threshold value.
Described device also comprises subframe processing unit 34, links to each other with subframe judging unit 33, is used for ignoring this no signal sub-frame when subframe judging unit 33 judges that subframe is no signal sub-frame.
No signal sub-frame is ignored in the unit that subframe is handled that described subframe processing unit 34 is relevant, promptly stops no signal sub-frame being handled, and, more properly, comprises the TPC/SS order that stops to carry out in the no signal sub-frame here.
Utilize the detailed process and the aforementioned method of the present invention of device detection no signal sub-frame of the present invention similar, do not repeat them here.
By above embodiment as seen, the present invention detects the noise power of this subframe, and threshold value is set according to this noise power, estimate the channel impulse response of this subframe, and obtain signal power according to this channel impulse response, afterwards, signal power that relatively obtains and threshold value, when signal power judges that this subframe is a no signal sub-frame during smaller or equal to threshold value, like this, receiving terminal can know that whether the subframe that receives is no signal sub-frame, and then can ignore this no signal sub-frame, promptly do not carry out the TPC/SS order in this no signal sub-frame, thereby guaranteed the correctness that through-put power is controlled and simultaneous bias is controlled in the DTX process.
Claims (12)
1, a kind of method that detects no signal sub-frame is characterized in that, comprising:
Threshold value is set; Calculate the signal power of this subframe;
Comparison signal power and threshold value when signal power is less than or equal to threshold value, judge that this subframe is a no signal sub-frame.
2, the method for claim 1 is characterized in that, the described threshold value that is provided with is realized by following mode:
Detect the noise power of this subframe;
Detected noise power is increased behind the bias as threshold value.
3, method as claimed in claim 2 is characterized in that, described bias can rule of thumb be redefined for one greater than 0 value.
4. the method for claim 1 is characterized in that, the signal power of described this subframe of calculating is realized by following mode:
Estimate the channel impulse response of this subframe, and obtain the signal power of this subframe according to this channel impulse response.
5, method as claimed in claim 4 is characterized in that, channel impulse response of described this subframe of estimation and the signal power that obtains this subframe according to this channel impulse response are realized by following mode:
Estimate on the every antenna channel impulse response by the received signal of every antenna from transmitted from transmitter to receiver;
Send the received power of signal according to following formula transmitter computes by the channel impulse response on the every antenna of estimating:
Wherein, k is a day wire size, and K is the sum of reception antenna, and n represents n footpath in the channel impulse response, N represents total footpath number in the channel impulse response window, (k is the channel impulse response in n footpath in the k root antenna upper signal channel impulse response window n) to h, is plural number, ‖ h (k, n) ‖ is for to do modulo operation to this channel impulse response, ‖ h (k, n) ‖
2Be the power of n footpath channel impulse response in the k root antenna upper signal channel impulse response window.
6, the method for claim 1 is characterized in that, described comparison signal power and threshold value also comprise:
When signal power greater than threshold value, judge that then this subframe is special burst sub-frame or data burst.
7, the method for claim 1 is characterized in that, ignore this subframe described further comprising when this subframe of judgement is no signal sub-frame.
8, a kind of device that detects no signal sub-frame is characterized in that, comprises the signal power computing unit, and threshold value is provided with unit and subframe judging unit, wherein,
The signal power computing unit is used to calculate the signal power of this subframe;
Threshold value is provided with the unit and is used to be provided with threshold value;
The subframe judging unit is used for more described signal power and threshold value, judges that when signal power is less than or equal to threshold value this subframe is a no signal sub-frame.
9, device as claimed in claim 8 is characterized in that, described signal power computing unit comprises channel impulse response estimation unit and signal power sum-average arithmetic unit, wherein,
The channel impulse response estimation unit is used to estimate the channel impulse response on the every antenna;
Channel impulse response on the every antenna that signal power sum-average arithmetic unit is used for being estimated by the channel impulse response estimation unit is tried to achieve the power of every footpath signal, and the signal power in every footpath on the every antenna is carried out obtaining after sum-average arithmetic calculates the signal power of this subframe.
10, device as claimed in claim 8 is characterized in that, described threshold value is provided with the unit and comprises the noise power detecting unit and increase bias unit, wherein,
The noise power detecting unit is used to detect the noise power of this subframe;
Increasing bias unit is used for the detected noise power of noise power detecting unit is increased after the biasing as threshold value.
11, device as claimed in claim 8 is characterized in that, described subframe judging unit also is used for more described signal power and threshold value, when signal power judges that this subframe is special burst sub-frame or data burst during greater than threshold value.
12, device as claimed in claim 8 is characterized in that, described device also comprises the subframe processing unit, is used for ignoring this no signal sub-frame when subframe judgment unit judges subframe is no signal sub-frame.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102281092A (en) * | 2011-08-15 | 2011-12-14 | 京信通信系统（中国）有限公司 | Signal receiving and treating method in mobile communication and system thereof |
| CN102523079A (en) * | 2011-12-05 | 2012-06-27 | 福建星网锐捷网络有限公司 | Method for determining wireless sending state, device and wireless access point |
| CN102882567A (en) * | 2012-06-18 | 2013-01-16 | 福建星网锐捷网络有限公司 | Antenna switching method and device and wireless access point (AP) |
| CN103428750A (en) * | 2012-05-17 | 2013-12-04 | 中兴通讯股份有限公司 | Method and device for reducing interference of newly-built cell to surrounding cells |
| CN104184528A (en) * | 2014-08-08 | 2014-12-03 | 广州海格通信集团股份有限公司 | Method and system for setting mute threshold of civil aviation receiver |
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2007
- 2007-05-25 CN CNA2007101076991A patent/CN101312368A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281092A (en) * | 2011-08-15 | 2011-12-14 | 京信通信系统（中国）有限公司 | Signal receiving and treating method in mobile communication and system thereof |
| CN102281092B (en) * | 2011-08-15 | 2014-11-19 | 京信通信系统（中国）有限公司 | Signal receiving and treating method in mobile communication and system thereof |
| CN102523079A (en) * | 2011-12-05 | 2012-06-27 | 福建星网锐捷网络有限公司 | Method for determining wireless sending state, device and wireless access point |
| CN103428750A (en) * | 2012-05-17 | 2013-12-04 | 中兴通讯股份有限公司 | Method and device for reducing interference of newly-built cell to surrounding cells |
| CN103428750B (en) * | 2012-05-17 | 2016-05-11 | 中兴通讯股份有限公司 | A kind of method and the device of newly-built community to peripheral cell interference that reduce |
| CN102882567A (en) * | 2012-06-18 | 2013-01-16 | 福建星网锐捷网络有限公司 | Antenna switching method and device and wireless access point (AP) |
| CN102882567B (en) * | 2012-06-18 | 2016-05-04 | 福建星网锐捷网络有限公司 | Antenna switching method, device and WAP |
| CN104184528A (en) * | 2014-08-08 | 2014-12-03 | 广州海格通信集团股份有限公司 | Method and system for setting mute threshold of civil aviation receiver |
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