CN101114870B - Method for transmitting non-synchronous random access guiding signal - Google Patents
Method for transmitting non-synchronous random access guiding signal Download PDFInfo
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- CN101114870B CN101114870B CN2006100889694A CN200610088969A CN101114870B CN 101114870 B CN101114870 B CN 101114870B CN 2006100889694 A CN2006100889694 A CN 2006100889694A CN 200610088969 A CN200610088969 A CN 200610088969A CN 101114870 B CN101114870 B CN 101114870B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
- H04W56/009—Closed loop measurements
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Abstract
The invention relates to a launching method of the asynchronous random access fronting signal, which is suitable for a time-multiplexed duplex communication system, comprising a first upstream business slot of the time-multiplexed duplex communication system on a wireless sub-frame or a TTI launching asynchronous random access fronting signal. The launching method of the asynchronous random access fronting signal by the invention can complete the function of launching the upstream synchronous timing and frequency reference signal by the big residential district, thus effectively improving theaccess rate of the random access.
Description
Technical field
The present invention relates to the digital mobile communication field, particularly relate in the tdd systems accidental access signal sending method based on the single carrier frequency division multiplex technique.
Background technology
The message transmission rate that following mobile communication system requires to provide will be up to more than the 100Mbit/s, and the business of support also will expand to multimedia service (comprising real-time streaming media service) from speech business.Can realize on limited frequency spectrum resources that two-forty and jumbo technology have become the focus of present research.Wide-band mobile communication system will experience the frequency selectivity of channel usually.The frequency selectivity of so-called channel is exactly the decay difference of channel on different frequency.Frequency-selective channel can cause serious intersymbol interference (ISI), inter-carrier interference (ICI) and multiple access to disturb (MAI) usually.The most frequently used method of contrary frequency selectivity decline is exactly to use the single carrier balancing technique at receiving terminal, and it is divided into single carrier wave time domain balancing technique and single-carrier wave frequency domain equalization technology two big classes.The single carrier wave time domain balancing technique is a kind of mature technique, possesses very strong antijamming capability.Yet the complexity of single carrier wave time domain equalizer and the maximum delay of channel are extended to the proportionate relationship that cube increases, so the single carrier wave time domain equalizer is difficult to realize in some practical application.It is another kind of that balancing technique---single-carrier wave frequency domain equalization technology has overcome the shortcoming of single carrier wave time domain balancing technique.Under frequency selective fading channels, received signal is the convolution that sends signal and channel impulse response on time domain, then is the product that sends signal and channel frequency domain response on frequency domain.According to the channel frequency domain response that channel estimating obtains, the single carrier frequency domain equalization device can carry out equilibrium respectively on each frequency, thereby computation complexity is reduced widely.In theory, the single carrier frequency domain equalization device is the same with the performance of single carrier wave time domain equalizer, and the complexity of its complexity and ofdm system is suitable.
Also has the processing mode of simplifying more for the single carrier frequency domain equalization device, by adding Cyclic Prefix or zero filling for the emission symbol, the linear convolution process of signal and channel is converted into circular convolution, simplified the processing of receiver, as long as the maximum delay of channel expansion energy window is controlled within the CP (cyclic preamble), just can remove user's self intersymbol interference (ISI) effectively.
If the time that uplink multi-users is arrived the base station all synchronously within a benchmark CP, just can be united Fourier transform processing with multi-user's received signal, simplified receiver multi-user's processing.
Uplink random inserts and can guarantee that uplink multi-users inserts in initiation, or by asynchronous in the conversion of synchronous regime, guarantee to arrive the time of base station all synchronously within a benchmark CP, the operation of the general process that uplink random inserts can take up emission targeting signal as timing reference, the time of advent of the reference signal that the up emission of base station measurement is leading, with the reference time ratio, determine that the terminal emission needs the time in advance or that lag behind, by descending order, notify terminal to adjust launch time in the mode of multi-system or stepping adjustment the time of needs adjustment then.This access procedure is commonly referred to as asynchronous random access procedure.
Simultaneously, dispatch request for uplink service, because the randomness of service request scheduling, also can be included into and insert category at random, but because before the service request scheduling, finished and be in synchronous regime, so this access procedure is commonly referred to as synchronous random access procedure, synchronous random access procedure is more emphasized the emission of the control signaling of request scheduling.
Because its uplink and downlink signals all is to launch at a frequency, therefore there is great difference in realization and FDD system in some aspects with respect to the FDD system in the TDD system.For a typical example of TDD system uplink using single carrier frequency division multiplexing as shown in Figure 1: Fig. 1 is the typical frame structure chart of TDD system.The 10ms frame is split into 2 isometric 5ms wireless sub-frames; each wireless sub-frame comprises 7 business time-slots (TS0 ~ TS6); synchronously and protection at interval between TS0 and TS1, length is 0.275ms, comprises DwPTS (descending pilot frequency time slot), GP (guard time) and UpPTS (uplink pilot time slot).Be 0.675ms the basic time of TTI, consistent with the business time-slot time.Guard time is to be used for protecting switching point between descending and up, can avoid TDD system descending and last interfering with each other in the ranks like this.
Generally speaking, adopt UpPTS to carry the leading emission that uplink random inserts signal.But for large-scale sub-district, length turn-on time of UpPTS is not sufficient to guarantee that accidental access signal arrives the detection probability of base station, simultaneously since the accidental access signal of different user because the difference of position in the sub-district of living in, the time of accidental access signal that causes arriving the base station is also inconsistent, if the user is far away more from center of housing estate, then its arrival delay is big more, and the accidental access signal after the delay can cause interference to the signal that other users transmit.So can not only rely on UpPTS to carry out the carrying that uplink random inserts signal.
Summary of the invention
Technical problem to be solved by this invention is, a kind of launching technique of non-synchronous random access guiding signal is provided, to finish the TDD single carrier access function at random under large-scale sub-district.
To achieve these goals, the invention provides a kind of launching technique of non-synchronous random access guiding signal, be applicable to tdd communication systems, comprising:
Described tdd communication systems is at first uplink service time slot of wireless sub-frame or the TTI Transmission Time Interval emission non-synchronous random access guiding signal corresponding with described business time-slot.
Described non-synchronous random access guiding signal takies described first uplink service time slot uplink service time slot afterwards in the mode of expansion or repetition.
Guard time is reserved at rear portion in described first uplink service time slot.
Described guard time is no more than 0.2ms.
Described method can also be based on the system of 1.25MHz, 2.5MHz, 10MHz, 15MHz or 20MHz bandwidth.
The invention also discloses a kind of launching technique of non-synchronous random access guiding signal, be applicable to tdd communication systems, comprising:
Described tdd communication systems is at uplink pilot time slot and first uplink service time slot emission non-synchronous random access guiding signal of wireless sub-frame;
Described non-synchronous random access guiding signal takies described first uplink service time slot uplink service time slot afterwards in the mode of expansion or repetition.
Guard time is reserved at rear portion in described first uplink service time slot.
Described guard time is no more than 0.2ms.
Described method can also be based on the system of 1.25MHz, 2.5MHz, 10MHz, 15MHz or 20MHz bandwidth.
The launching technique of non-synchronous random access guiding signal provided by the invention can be finished the emission upstream synchronous timing of large-scale sub-district, the function of frequency reference signal, effectively raises the access probability that inserts at random.
Description of drawings
Fig. 1 is the typical frame structure schematic diagram of TDD;
Fig. 2 is the Random Access Channel Burst Period frame structure schematic diagram of TDD system;
Fig. 3 is the random cut-in channel frame structural representation of TDD system.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in further detail.
In order to guarantee in large-scale sub-district, non-synchronous random access guiding signal arrives the detection probability of base station, and the non-synchronous random access guiding signal that the user sent of guaranteeing to be positioned at the sub-district diverse location arrives the time unanimity of base station, the present invention improves the method for emission non-synchronous random access guiding signal, has expanded the opportunity that can be used for launching targeting signal.
As shown in Figure 2, be Random Access Channel Burst Period frame structure schematic diagram of the present invention.In the present invention, the TDD tdd systems is at first uplink service time slot (TS1) of wireless sub-frame or TTI (Transmission Time Interval) the emission non-synchronous random access guiding signal corresponding with this time slot, the length of its business time-slot and this TTI is 0.675ms, as shown in FIG., be Random Access Channel 1, Random Access Channel 1 '.Guard time GP2 can be reserved in rear portion in this first uplink service time slot (TS1), and the length of GP2 is about 100 μ s.Certainly, this guard time band can be regulated according to the size of sub-district, but no longer than 0.2ms.If cause still can not realizing smoothly the access of targeting signal owing to reasons such as customer locations, in the present invention, this non-synchronous random access guiding signal can also take this first uplink service time slot uplink service time slot afterwards with expansion or the mode that repeats.For example, in conjunction with the structure of the uplink and downlink timeslot of Fig. 1, also can utilize the uplink service time slot of TS2 or TS3 or next subframe, guard time band GP2 is according to repeating or the expansion ratio prolongs.After inserting successfully, each time slot can carry out transfer of data.
Another embodiment of the present invention as shown in Figure 3.The TDD tdd systems is at uplink pilot time slot (UpPTS) and first uplink service time slot TS1 (perhaps corresponding with this business time-slot TTI) of wireless sub-frame, the length of this business time-slot or TTI is 0.675ms, as shown in Figure 3, be Random Access Channel 2, Random Access Channel 2 '.Guard time GP2 ' can be reserved in rear portion in this first uplink service time slot (TS1), and the length of GP2 ' is about 100 μ s.Certainly, this guard time band can be regulated according to the size of sub-district, but no longer than 0.2ms.Can constitute the integral multiple of modulation symbol length behind the signal length deduction boundary belt of non-synchronous random access guiding signal.In the present invention, this non-synchronous random access guiding signal can also take this first uplink service time slot uplink service time slot afterwards with expansion or the mode that repeats.For example, in conjunction with the structure of the uplink and downlink timeslot of Fig. 1, also can utilize the uplink service time slot of TS2 or TS3 or next subframe, guard time band GP2 is according to repeating or the expansion ratio prolongs.After inserting successfully, each time slot can carry out transfer of data.
The present invention can be based on the system of 1.25M bandwidth.For other bandwidth situation such as 2.5M, 10M, 15M, 20M, only needing that corresponding parameters is done simple change can implement.
The method disclosed in the present, expanded the opportunity that can be used for launching targeting signal, guaranteed that in large-scale sub-district accidental access signal arrives the detection probability of base station, and the accidental access signal that the user sent of guaranteeing to be positioned at the sub-district diverse location arrives the time unanimity of base station.Can finish the emission upstream synchronous timing of large-scale sub-district, the function of frequency reference signal, improve the access probability that inserts at random effectively.
The various embodiments described above are only in order to illustrate characteristics of the present invention, make those of ordinary skill in the art can understand content of the present invention and enforcement according to this, be not to be used to limit scope of the present invention, the equivalent modifications of dying all not departing from the scope of the present invention and finishing still is included in claims of the following stated.
Claims (9)
1. the launching technique of a non-synchronous random access guiding signal is applicable to tdd communication systems, it is characterized in that, comprising:
Described tdd communication systems is at first uplink service time slot of wireless sub-frame or the Transmission Time Interval emission non-synchronous random access guiding signal corresponding with described business time-slot.
2. the method for claim 1 is characterized in that, also comprises, described non-synchronous random access guiding signal takies described first uplink service time slot uplink service time slot afterwards in the mode of expansion or repetition.
3. the method for claim 1 is characterized in that, also comprises, guard time is reserved at the rear portion in described first uplink service time slot.
4. method as claimed in claim 3 is characterized in that, also comprises, described guard time is no more than 0.2ms.
5. the method for claim 1 is characterized in that, described method can also be based on the system of 1.25MHz, 2.5MHz, 10MHz, 15MHz or 20MHz bandwidth.
6. the launching technique of a non-synchronous random access guiding signal is applicable to tdd communication systems, it is characterized in that, comprising:
Described tdd communication systems is at uplink pilot time slot and first uplink service time slot emission non-synchronous random access guiding signal of wireless sub-frame;
Described non-synchronous random access guiding signal takies described first uplink service time slot uplink service time slot afterwards in the mode of expansion or repetition.
7. method as claimed in claim 6 is characterized in that, also comprises, guard time is reserved at the rear portion in described first uplink service time slot.
8. method as claimed in claim 7 is characterized in that, also comprises, described guard time is no more than 0.2ms.
9. method as claimed in claim 6 is characterized in that, described method can also be based on the system of 1.25MHz, 2.5MHz, 10MHz, 15MHz or 20MHz bandwidth.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100889694A CN101114870B (en) | 2006-07-27 | 2006-07-27 | Method for transmitting non-synchronous random access guiding signal |
| PCT/CN2007/002179 WO2008014672A1 (en) | 2006-07-27 | 2007-07-17 | Transmitting method for asynchronism random access pilot signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100889694A CN101114870B (en) | 2006-07-27 | 2006-07-27 | Method for transmitting non-synchronous random access guiding signal |
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| CN101114870A CN101114870A (en) | 2008-01-30 |
| CN101114870B true CN101114870B (en) | 2010-12-29 |
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| EP2502696B1 (en) * | 2011-03-22 | 2014-02-12 | Agie Charmilles SA | Method and device for digital data transfer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0670640A2 (en) * | 1994-03-03 | 1995-09-06 | Telia Ab | Arrangement for a TDMA/TDD radiocommunication system with a structure for combining time slots |
| CN1241877A (en) * | 1998-07-14 | 2000-01-19 | 三星电子株式会社 | Method of initializing packet traffic channel in communication system |
| CN1855767A (en) * | 2005-04-18 | 2006-11-01 | 大唐移动通信设备有限公司 | Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010020093A (en) * | 1999-08-14 | 2001-03-15 | 박기업 | System providing pilot channels divided into slots wireless telecommunication |
| CN100514873C (en) * | 2000-02-08 | 2009-07-15 | Ipr特许公司 | Access channel structure for wireless communication system |
| CN1741423A (en) * | 2004-08-23 | 2006-03-01 | 大唐移动通信设备有限公司 | Method for eliminating interference of downgoing pilot channel |
| CN1905428B (en) * | 2005-07-25 | 2010-08-18 | 上海原动力通信科技有限公司 | Transmission method of TDD mobile communication system with low delay character |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0670640A2 (en) * | 1994-03-03 | 1995-09-06 | Telia Ab | Arrangement for a TDMA/TDD radiocommunication system with a structure for combining time slots |
| CN1241877A (en) * | 1998-07-14 | 2000-01-19 | 三星电子株式会社 | Method of initializing packet traffic channel in communication system |
| CN1855767A (en) * | 2005-04-18 | 2006-11-01 | 大唐移动通信设备有限公司 | Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes |
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| CN101114870A (en) | 2008-01-30 |
| WO2008014672A1 (en) | 2008-02-07 |
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