CN1247009A - Transmission method and radio system for adjusting transmission moments - Google Patents
Transmission method and radio system for adjusting transmission moments Download PDFInfo
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- CN1247009A CN1247009A CN98802307.5A CN98802307A CN1247009A CN 1247009 A CN1247009 A CN 1247009A CN 98802307 A CN98802307 A CN 98802307A CN 1247009 A CN1247009 A CN 1247009A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 title abstract description 7
- 230000002596 correlated effect Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 230000008054 signal transmission Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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Abstract
A transmission method and a radio system comprising at least one base station (100) and a number of subscriber terminals (201-203), at least two of which transmit access bursts to one and the same base station. The access burst activates between a subscriber terminal and a base station a connection that is established by a signal that is of a certain frequency and is sent in time slots. The radio system comprises transmission means (101), which command the subscriber terminal to send the base station (100) a signal that employs a time slot and frequency already used by another subscriber terminal. The radio system further comprises adjustment means (205), which on the basis of the command sent by the transmission means (101) adjust the transmission moment of the signal to be transmitted to the base station (101) so that the base station (101) receives the transmitted signals at different moments.
Description
The present invention relates to a kind of sending method that is used for wireless system, this wireless system comprises at least one base station and some user terminals, wherein at least two user terminals send to same base station and insert pulse train (access burst), insert pulse train and activate one be connected between user terminal and base station, this connection is set up by a signal that has a certain frequency and send in time slot.
Indoor, for example in office building, use some to be particularly suitable for the base station in this place.The base station receives and sends signal by the RF head.The RF head of base station be placed in building near so that the area of coverage of base station covers whole building as far as possible.In fact, the RF head comprises for example transceiver antenna unit.
When indoor wireless system of design, must pay special attention to influence the factor that signal is propagated.Body of wall in the building and other structures be deamplification soon.The quick decay of signal may require a kind of very intensive base station network, thereby the RF head is also close toward each other.Because need a large amount of base stations, the construction of system is relatively costly.
These RF heads are placed near the suitable place of building, thereby can connect between user terminal and base station.Because a large amount of RF heads is arranged, therefore can reduce the distance between user terminal and the RF head, this has also reduced the time-delay from the RF head to user terminal simultaneously.
The number of RF head is usually greater than the number of base station transmitter.In addition, the number of transmitter is usually also greater than the number of used radio frequency in the base station.Suppose that user terminal connects with the different RF head of same base station by the signal that they sent.If user terminal is by the signal foundation of same frequency and being connected of base station, between the RF head, can occur so disturbing.If signal uses same frequency to send at same time slot, then there is more interference to occur probably.In fact the RF head receives interference signal in receiving information signal, thereby information signal is difficult to separate with interference signal.
A kind of known training sequence of the general use of wireless system, this training sequence is added in the pulse train that will send.Training sequence is used for estimating the impulse response of received signal.If two user terminals use identical training sequence, so, the receiver of base station is difficult to information signal is separated with interference signal.In fact, this means, isolate interference signal the impulse response of the information signal that this receiver can not be estimated from it, thereby diminish quality of signals.In connection, use the signal of different frequency to address this problem, yet the frequency number that can use but is limited.If only send the signal with different frequency in wireless system, the expenditure of construction of this wireless system is just high so.
Be applicable in the indoor office base station so-called,, therefore will use relatively low signal transmission power because the RF head places near the clerical workforce.Yet, because transmitting power is low, not reaching enough estimation reliably with known in the past method, this will diminish the performance of receiver.
The purpose of this invention is to provide a kind of sending method and a kind of wireless system that can address the above problem.Can reach this purpose with the method described in the foreword, this method is characterized in that, when the order user terminal when the base station sends a use by the signal of used time slot of another user terminal and frequency, send an order to this user terminal, with the x time of adjustment signal, thereby make the base station receive the signal that is sent in the different moment.
The invention still further relates to a kind of wireless system, this wireless system comprises at least one base station and some user terminals, wherein at least two user terminals send to same base station and insert pulse train, insert pulse train and activate one be connected between user terminal and base station, this connection is set up by a signal that has a certain frequency and send in time slot.
This wireless system is characterized in that, it comprises emitter, this emitter order user terminal sends a use by the used time slot of another user terminal and the signal of frequency to the base station, and adjusting device, this adjusting device will send to the x time of signal of base station according to the order adjustment that emitter sent, so that the base station receives the signal that is sent in the different moment.
Described in preferred implementation of the present invention such as the dependent claims.
Basic thought of the present invention is, the signal that delay in case of necessity will send, thereby, interference signal and information signal can be separated from each other.
Utilize sending method of the present invention and wireless system can obtain some advantages.Because after signal was received, these signals that send with same frequency can be separated, therefore, utilizes the different radio frequency of minute quantity just can realize this wireless system.User terminal can use same frequency with the signal that an adjacent R F signal post uses simultaneously.This has reduced the required expense of this wireless system of building: the number that for example can reduce transmitter.In addition, even can also come received signal with very low signal incoming level.
Below, will the present invention be described in detail in detail in conjunction with preferred implementation and with reference to accompanying drawing, wherein
Fig. 1 is the general illustration that adopts the wireless system of the inventive method,
Fig. 2 is the general illustration of the structure of transceiver used in the wireless system of the present invention,
Fig. 3 shows wireless system of the present invention,
Fig. 4 be wireless system of the present invention detailed maps and
Fig. 5 shows the calibration pulse string of gsm system.
Fig. 1 is the general illustration that adopts the wireless system of the inventive method.This wireless system comprises some base stations 100, base station controller 300 and some user terminal 201-203.The base station for example is connected to base station controller 300 by transmission line.The signal that user terminal utilizes them to send is established to the connection of base station.For example another user terminal is arrived with the signal forwarding that user terminal sent usually in base station 100.In fact, base station 100 and user terminal 201-203 play the transceiver effect.
Fig. 2 is the general illustration of the structure of transceiver used in the wireless system of the present invention.Base station and user terminal generally comprise the structure shown in Fig. 2.Transceiver comprises an antenna 108, and it is as the antenna of transceiver.In addition, transceiver also comprises 112,124, modulators of radio-frequency unit 123, a demodulator 113 and a controll block 120.
Transceiver also comprises an encoder 122 and a decoder 114.The operation of above-mentioned each piece of transceiver of controll block 120 controls.The radiofrequency signal frequency conversion that radio-frequency unit 112 will obtain from antenna 108 is an intermediate frequency.Intermediate-freuqncy signal is input to demodulator 112, and demodulator carries out demodulation to this signal.Signal after the demodulation is then decoded in decoder 114.
Signal after encoder 112 received signals also will be encoded sends to modulator 123.Coding in the encoder 122 for example can adopt convolutional encoding to realize.Encoder 122 is for example also encrypted signal.Moreover, the bit or the bit sequence of encoder 122 interleaving signals.Signal after the convolutional encoding is input to modulator 123 again, and modulator is modulated this signal.Signal after the modulation is input to radio-frequency unit 124 then, and radio-frequency unit is a radiofrequency signal with the modulation signal frequency conversion.Radio-frequency unit 124 sends to this signal in the wireless path by antenna 108.
Fig. 3 shows wireless system of the present invention.This wireless system comprises some RF 161-167 and two user terminals 201,202.This wireless system is particularly suitable for indoor, for example office building.In fact, the RF head is placed in indoor, so that the signal that send by the RF hair covers whole building as far as possible.This wireless system also comprises four transmitter 141-144, device 130 and jockey 150.In fact, these transmitters 141-144, device 130 and jockey 150 are installed in 100 places, base station.In the wireless system shown in the figure, RF 161-167 links to each other with jockey 150 by cable 170.Jockey 150 is connected to device 130 by transmitter 141-144 again, and device 130 provides an Abis interface between base station 100 and base station controller 300.
User terminal utilizes the access pulse train that it sends, and activates the establishment of connection with base station 100.Base station 100 receives by RACH channel (RACH=inserts at random) and inserts pulse train.After receiving the access pulse train, the base station controller 300 of the base station 100 of control wireless system sends a signal that activates channel to base station 100.In this wireless system, preferably adopt time division multiple access TDMA method, thereby, in time slot, send the signal that connects.In fact, by sending the signal of different frequency, can increase the number that connects simultaneously.
Fig. 4 illustrates in greater detail wireless system of the present invention.This wireless system comprises emitter 101 and relevant apparatus 102.Emitter 101 sends order to user terminal, and user terminal is ordered the frequency that changes its signal transmitted according to these.Relevant apparatus 102 produces impulse response according to the signal that base station 100 is received.In addition, this wireless system also comprises data storage device 103, the information of used radio frequency in the relevant wireless system of this device storage.In the wireless system shown in the figure, device 101,102,103 is communicated by letter with base station 100.In fact, device 101,102,103 is installed in 100 places, base station.
With reference to Fig. 3, we suppose that at first the radio frequency number of using in 100 places, base station is less than transmitter 141-144 number contained in the base station 100.There is shown user terminal 201,202 communicates by letter with same base station 100 by different RF heads.We suppose that again these user terminals use similar training sequence, utilize this sequence estimation to go out the impulse response of received signal.If these user terminals use identical frequency and time slot, so, between RF 166,167, can occur disturbing.Suppose that the user terminal 201 in the wireless system produces an interference signal 311, this signal propagates into RF 167.Suppose that again user terminal 202 produces an interference signal 312, this signal propagates into RF 166.
Relevant apparatus 102 is according to relevant, and selected have the best in quality or a signal of highest energy for example, again this signal set up signal as actual the connection.Also place so-called window according to the relevant signal that produces.Relevant apparatus 102 relatively places the total energy of impulse response of the signal of window, thereby can detect RF received interference signal.But also can detect the user terminal that produces this interference signal.
In wireless system shown in Figure 3, in fact RF 166,167 receives interference signal in receiving information signal.Because two user terminals 201,202 use identical training sequence, therefore, base station 100 is difficult to information signal is separated with interference signal.In fact, this means, isolate interference signal the impulse response of the information signal that the receiver of base station 100 can not be estimated from it, thereby diminish quality of signals.
Suppose that emitter 101 order user terminals are to signal with a certain time slot and frequency of base station 100 emissions, this time slot and frequency are used and be stored in the storage device 103 by another user terminal.Then, adjusting device 205 is adjusted the x time of the signal that will send to base station 100.Adjusting device 205 is adjusted x time before being preferably in actual connection foundation.
Fig. 5 shows a calibration pulse string of gsm system for example, and this pulse train comprises so-called tail bit in two pieces 401,407.Here have 6 tail bits.Real data is encoded in two pieces 402,406.Every comprises 57 data bits.This pulse train also comprises two 1 bit blocks 403,405, and they are used for detecting signaling.This pulse train also comprises a training sequence 404 that the front is known in the middle.In addition, this pulse train also comprises the protection section of one 8.25 bit.In a calibration pulse string, training sequence length is 26 bits.In known solution, for example in GSM, by received signal sample value and known training sequence cross-correlation are estimated impulse response.In the training sequence of 26 bit long, wherein there are 16 bits to be used to estimate each impulse response component.
Adjusting device 205 utilizes the tail bit 401 of pulse train section start to adjust the x time of signal.The protection section 408 at place, pulse train end also is used for adjusting this pulse train.Therefore, pulse train has comprised operable 11.25 bits when adjustment needs definitely.Therefore, adjusting device 205 postpones the x time of signal or is 11 bits in fact at the most in advance.This adjustment that sends signal can make training sequence 100 sentence the different moment and be received in the base station, thereby 100 places are by relevant in the base station, can separate these with same frequency and at signal that same time slot was sent.If it is too big that the signal that user terminal sent disturbs the signal that another user terminal sent, so, emitter 101 these interference user terminals of order change the signal tranmitting frequency.
In the wireless system shown in the figure, because the distance of user terminal RF head of 100 from the base station is short, therefore the signal that sends in the wireless path arrives receiver soon.This means that the signal lag on the wireless path is short.This short time delay makes the impulse response of being estimated be limited in for example length of 3 or 4 bits.In fact, relevant apparatus 102 is substantially limited in 3 bits with this impulse response.If adjusting device 205 is adjusted the timing of user terminals 201,202, so base station 100 can be for example in 4 bits time-delay received signal constantly, thereby different impulse response is no longer staggered.Therefore, adjusting device 205 is adjusted the x time of signal, makes base station 100 receive the signal that user terminal sent in the different moment.
As mentioned above, can measure, for example measure energy the signal that base station 100 is received.According to measurement, the signal of determining that RF 161-167 receive with high impulse response energy.Also can compare, so that will expect that the total energy of each correlated components of the total energy of each correlated components of signal and interference signal compares RF the signal that 161-167 received.Formula (1) below utilizing is estimated the ratio that amounts to energy:
Wherein:
C is the intensity of information signal,
I is the intensity of interference signal,
h
iBe the impulse response of the instantaneous expection signal of i,
h
jImpulse response for the instantaneous interference signal of j.
Because the impulse response of known expection signal and interference signal therefore can adopt a kind of so-called associated detecting method, and this has also improved the performance of receiver.This associated detecting method, JMLSE method for example can be used to for example improve the bit error rate (BER) of signal.
Although abovely described the present invention with reference to the example shown in the accompanying drawing, yet, should be appreciated that the present invention is not limited thereto, and change in many ways in the scope of the inventive concept that can in the appended claims book, be set forth.
Claims (33)
1. sending method that is used for wireless system, this wireless system comprises at least one base station (100) and some user terminals (201-203), wherein at least two user terminals send to same base station and insert pulse train, this inserts pulse train and activates one be connected between user terminal and base station, this connection is set up by a signal that has a certain frequency and send in time slot, this method is characterized in that, when the order user terminal when the base station sends a use by the signal of used time slot of another user terminal and frequency, send an order to this user terminal, with the x time of adjustment signal, thereby make the base station receive the signal that is sent in the different moment.
2. the method for claim 1 is characterized in that, adjusts x time before reality connects foundation.
3. the method for claim 1 is characterized in that, sends an order, with the x time of inhibit signal.
4. the method for claim 1 is characterized in that, sends an order, to shift to an earlier date the x time of signal.
5. the method for claim 1 is characterized in that, sends an order, and postponing with the x time with signal is 11 bits in fact at the most.
6. the method for claim 1 is characterized in that, sends an order, is 11 bits in fact at the most in advance with the x time with signal.
7. the method for claim 1 is characterized in that, the x time of adjusting signal is the tail bit of pulse train section start and the protection section at place, pulse train end at the most.
8. the method for claim 1 is characterized in that, produces impulse response by the signal that the base station received, and the minimum length that the predetermined pulse response has is actually 3 bits.
9. the method for claim 1 is characterized in that, at least two signals with same frequency are separated from each other, and these signals are received from same time slot by the base station.
10. method as claimed in claim 9 is characterized in that, utilizes the training sequence at the constantly received signal of difference to separate these signals.
11. the method for claim 1 is characterized in that, the signal that the base station received is by relevant, and according to relevant, selected signal with best in quality and for example highest energy is set up signal with this signal with connecting again.
12. the method for claim 1 is characterized in that the signal that the base station received is correlated with by training sequence, places window according to the relevant signal that produces, and relatively places the total energy of impulse response of the signal of window.
13. the method for claim 1 is characterized in that, if the signal that user terminal sent has interference to the signal that another user terminal sent, so, orders this user terminal to change the signal tranmitting frequency.
14. the method for claim 1 is characterized in that, the used frequency of unlike signal is scheduled to.
15. the method for claim 1 is characterized in that, adopts time division multiple access TDMA method to send signal.
16. the method for claim 1 is characterized in that, used wireless system during this method is particularly useful for for example handling official business.
17. wireless system, comprise at least one base station (100) and some user terminals (201-203), wherein at least two user terminals send to same base station and insert pulse train, this inserts pulse train and activates one be connected between user terminal and base station, this connection is set up by a signal that has a certain frequency and send in time slot, it is characterized in that this wireless system comprises
Emitter (101), this emitter order user terminal to base station (100) send a use by the signal of used time slot of another user terminal and frequency and
Adjusting device (205), the order adjustment that this adjusting device is sent according to emitter (101) will send to the x time of the signal of base station (101), so that base station (101) receive the signal that is sent in the different moment.
18. wireless system as claimed in claim 17 is characterized in that, before reality connected foundation, adjusting device (205) was adjusted x time.
19. wireless system as claimed in claim 17 is characterized in that, emitter (101) sends the order of the x time of an inhibit signal.
20. wireless system as claimed in claim 17 is characterized in that, emitter (101) sends an order of the x time of signal in advance.
21. wireless system as claimed in claim 17 is characterized in that, it is the order of 11 bits in fact at the most that emitter (101) sends an x time delay with signal.
22. wireless system as claimed in claim 17 is characterized in that, it is the order of 11 bits in advance in fact at the most that emitter (101) sends the x time with signal.
23. wireless system as claimed in claim 17 is characterized in that, the x time that adjusting device (205) is adjusted signal is the tail bit of pulse train section start and the protection section at place, pulse train end at the most.
24. wireless system as claimed in claim 17 is characterized in that, adjusting device (205) is installed in the user terminal.
25, wireless system as claimed in claim 17, it is characterized in that, this wireless system comprises relevant apparatus (102), and the signal that is used for receiving according to the base station produces impulse response, and the response of relevant apparatus (102) predetermined pulse has minimum length and is actually 3 bits.
26. wireless system as claimed in claim 17, it is characterized in that, this wireless system comprises relevant apparatus (102), and this device basis and the training sequence that the signal that user terminal is sent together sends are separated from each other at least two signals that have same frequency and receive from same time slot.
27. wireless system as claimed in claim 17, it is characterized in that, this wireless system comprises relevant apparatus (102), this device is correlated with to the signal that the base station received, and according to relevant, selected have the best in quality or a signal of highest energy for example, again this signal set up signal as actual the connection.
28. method as claimed in claim 17, it is characterized in that, this wireless system comprises relevant apparatus (102), this device utilizes training sequence that the signal that the base station received is correlated with, to place window according to the relevant signal that produces, and relatively place the total energy of impulse response of the signal of window, thereby can detect interference signal and produce the user terminal of interference signal.
29. wireless system as claimed in claim 17 is characterized in that, this wireless system comprises relevant apparatus (102), and this device is correlated with to the signal that the base station received, and according to relevant, detects signal is received noisy signal.
30. wireless system as claimed in claim 17 is characterized in that, and is too big if the signal that user terminal sent disturbs the signal that another user terminal sent, so, emitter (101) orders this user terminal to change the signal tranmitting frequency.
31. wireless system as claimed in claim 17 is characterized in that, this wireless system comprises storage device (103), this device storage relevant in unlike signal the information of the frequency of usefulness.
32. wireless system as claimed in claim 17 is characterized in that, in this wireless system, adopts time division multiple access TDMA method.
33. wireless system as claimed in claim 17 is characterized in that, the base station of this wireless system (100) are so-called office base stations.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI974446 | 1997-12-05 | ||
| FI974446A FI106837B (en) | 1997-12-05 | 1997-12-05 | Broadcasting procedure and radio system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1247009A true CN1247009A (en) | 2000-03-08 |
Family
ID=8550073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98802307.5A Pending CN1247009A (en) | 1997-12-05 | 1998-12-04 | Transmission method and radio system for adjusting transmission moments |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0958707A1 (en) |
| JP (1) | JP2001510669A (en) |
| CN (1) | CN1247009A (en) |
| AU (1) | AU1437699A (en) |
| FI (1) | FI106837B (en) |
| NO (1) | NO993769L (en) |
| WO (1) | WO1999030523A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69938185T2 (en) * | 1999-12-21 | 2009-07-23 | Lucent Technologies Inc. | A method and apparatus for operating a cellular telecommunications system |
| US6778513B2 (en) * | 2000-09-29 | 2004-08-17 | Arraycomm, Inc. | Method and apparatus for separting multiple users in a shared-channel communication system |
| CN1969469B (en) | 2004-06-18 | 2012-06-20 | 艾利森电话股份有限公司 | Co-sequence interference detection and treatment method, device therefor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI94994C (en) * | 1992-10-19 | 1995-11-27 | Nokia Telecommunications Oy | Distributed access method in a radio system |
| CN1101088C (en) * | 1995-06-05 | 2003-02-05 | 西尔可穆无线公司 | Timing adjustment control for efficient time division duplex communication |
| GB2308041B (en) * | 1995-12-05 | 2000-03-29 | Motorola Ltd | Communication system with base station transceiver and radio communication units |
-
1997
- 1997-12-05 FI FI974446A patent/FI106837B/en active
-
1998
- 1998-12-04 AU AU14376/99A patent/AU1437699A/en not_active Abandoned
- 1998-12-04 CN CN98802307.5A patent/CN1247009A/en active Pending
- 1998-12-04 EP EP98958275A patent/EP0958707A1/en not_active Withdrawn
- 1998-12-04 JP JP53014199A patent/JP2001510669A/en active Pending
- 1998-12-04 WO PCT/FI1998/000946 patent/WO1999030523A1/en not_active Application Discontinuation
-
1999
- 1999-08-04 NO NO993769A patent/NO993769L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FI106837B (en) | 2001-04-12 |
| EP0958707A1 (en) | 1999-11-24 |
| WO1999030523A1 (en) | 1999-06-17 |
| AU1437699A (en) | 1999-06-28 |
| NO993769L (en) | 1999-10-04 |
| NO993769D0 (en) | 1999-08-04 |
| JP2001510669A (en) | 2001-07-31 |
| WO1999030523A8 (en) | 1999-09-23 |
| FI974446A0 (en) | 1997-12-05 |
| FI974446A (en) | 1999-06-06 |
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