CN1161766A - Transmission timing control in digital radio telephone - Google Patents
Transmission timing control in digital radio telephone Download PDFInfo
- Publication number
- CN1161766A CN1161766A CN 95195794 CN95195794A CN1161766A CN 1161766 A CN1161766 A CN 1161766A CN 95195794 CN95195794 CN 95195794 CN 95195794 A CN95195794 A CN 95195794A CN 1161766 A CN1161766 A CN 1161766A
- Authority
- CN
- China
- Prior art keywords
- timing
- subscriber unit
- base station
- bag
- transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
In time domain multiplex/time domain multiple access communications between a base station and subscriber unit, the base station sends a timing reference signal. A subscriber unit responds with a data packet (a) sufficiently short to ensure correct reception by the base irrespective of transmission time. The base determines the transmission time taken and instructs the subscriber unit to advance its timings so that longer data packets (b) can be sent so as to be received when expected. The timing adjustment includes both a fixed present component dependent on approximate separation of base station and subscriber unit, and a second component from measurement of the transmission time taken.
Description
The present invention relates to the timing of control data bag transmission in the predetermined time slot of regular length time frame.
Time division multiplexing/time division multiple access (TDM/TDMA) communicating requirement must arrive the base station in the suitable time from the signal that each subscriber unit with base station communication comes, otherwise may arrive this base station in the identical moment from the part of the next two or more packets of different subscriber units, then this base station can not correctly receive all bags.In the TDM/TDMA of routine system, such as GSM (" global system for mobile communications ") system, the base station sends reference timing signal to subscriber unit, and notifies that each subscriber unit should what send so that be received with correct timing from this base station that is transmitted in of subscriber unit in advance than reference signal.Therefore, correctly aimed in its tdma slot at each packet of base station.Do not have such auto-adaptive time to aim at, these wrap and must separate enough big protection at interval, allow possible maximum time delay between subscriber unit and the base station, cause the availability of frequency spectrum not high.
Various aspects of the present invention limit in claims, should be referring to these claims at this.
One aspect of the present invention preferably relates to by the base station controls method from the transmit timing of the subscriber unit that is used to receive in predetermined time slot, wherein base station transmits one timing reference signal is given subscriber unit, the short relatively direct packets that the subscriber unit transmission is received by the base station, the base station is according to determining a value from the propagation delay of time of reception between base station and subscriber unit of direct packets, and the base station in response subscriber unit notifies it to carry out the timing of transmitting subsequently from subscriber unit.
The timing of subscriber unit is regulated and is comprised according to the approximate distance of subscriber unit and base station and the first predetermined fixed component and by measuring the second component of determining from the time of advent of the direct packets of subscriber unit.Second component can change.And in case determined that second component, a message just are sent to setting and are used for the subscriber unit that the timing of packets of information is subsequently regulated.
Regularly regulate the transmission that comprises the direct packets from the subscriber unit to the base station according to self adaptation of the present invention.Direct packets have than normal bag short the duration.Guarantee the duration of direct packets shorter to receive direct packets from different subscriber units, make them not overlapping in time in this base station.Direct packets can comprise system's control data and/or short message message, and long normal bag can comprise system's control data and such as the out of Memory of user data.
Another aspect of the present invention preferably relates to the method for TDMA call setup, and wherein the aloha of call setup request is transmitted in direct packets, and direct packets is repeated to send a period of time and is received by the base station being used for, and direct packets is relatively shorter than normal bag.So, if a direct packets correctly is not received, maybe can not makes regularly to regulate and be determined, then adopt direct packets aloha request subsequently still correctly to be received, or regularly regulate and still can determine.Direct packets subsequently can be made as different frequencies to guarantee the reliable reception under different environmental conditions.
Another aspect of the present invention preferably from the base station transmits initial package to subscriber unit, initial package comprise the timing signal that is used to regulate from the subscriber unit to the base station the timing signal sequence.
The timing of the bag in a system between base station and each subscriber unit is regulated and is comprised a fixed component so that setover at the enterprising line time of up link and down link.
The present invention preferably relates to a kind of method that the timing of up link and downlink packet is regulated in tdma system on the other hand, comprising: send a reference signal from the base station; Respond described reference signal and send direct packets from subscriber unit; Determine regularly to regulate from the time of reception of described direct packets in the base station; Represent that the signal that described timing is regulated is transferred to subscriber unit to regulate it regularly.In case regulate, then the normal length bag can be transmitted.
The invention still further relates to the device of these methods of enforcement.
Contrast accompanying drawing narration the preferred embodiments of the present invention now by way of example, wherein:
Fig. 1 is the schematic diagram that expression comprises the system of a base station (BTE base station terminal equipment) and subscriber unit (the NTE network equipment);
Fig. 2 is the frame structure and the figure regularly of expression duplex link;
Fig. 3 is the figure of the transmission of timing of expression downlink/uplink and uplink pilot bag, and wherein up link is to the base station (BTE base station terminal equipment) from subscriber unit (NTE network-termination device).
Fig. 4 is the figure that the timing of the normal bag of expression up link transmission is regulated;
Fig. 5 (a) is the expression of uplink pilot bag;
Fig. 5 (b) is the expression that is used for the normal bag of the up link of comparing with the uplink pilot bag shown in Fig. 3 (a);
Fig. 6 (a) is the expression of down link direct packets;
Fig. 6 (b) is the expression of down link direct packets; Be used for comparing with Fig. 6 (a).
Fundamental system:
As shown in fig. 1, this preferred systems is the part of telephone system, and wherein this locality from the switch to user has line loop to be replaced by the full duplex line current source road between fixed base stations and the fixed subscriber unit.This optimum decision system comprises duplex wireless current source road and is used to realize the transmitter and the receiver of necessary agreement.Optimum decision system and digital cellular mobile telephone system exist similitude as known in the art between the GSM.This system uses the agreement based on hierarchical mode, particularly with lower floor: PHY (physics), MAC (medium access control system), DLC (data link control), NWK (network).
A difference of comparing with GSM is that in this optimum decision system, subscriber unit is in the fixed location and does not need the handover setting or other relevant ambulant characteristic.For example, this means in this optimum decision system and can use directional antenna and civil power.
Each base station in this optimum decision system provides 6 duplex wireless current source roads in 12 frequencies selecting from whole Frequency Distribution, so that the interference minimum between approaching base station.The frame structure of duplex link and timing are shown among Fig. 2.Every duplex wireless current source road comprise from the subscriber unit to the base station up link and with fixed frequency skew, down link from the base station to the subscriber unit.Down link is TDM, and up link is TDMA.The modulation of all links is that the basic frame structure of π/4 DQPSK and all links is ten time slots of frame of each 2560 bit.Bit rate is 512 Kb/s.Down link sends continuously and incorporates broadcast channel as basic system information into.When not having user profile to send, downlink transmission continues to use basic frame and structure of time slot and comprises suitable fill pattern (Fillpattem).
For the two the transmission of up link and down link, two class time slots are arranged; Normal time slot that after call setup, uses and the guiding time slot that during call setup, uses.
As shown in Fig. 6 (b), the normal time slot of each down link comprises the synchronizing information of 24 bits, then is the S field that comprises 24 bit appointments of 8 bit header, then is the D field of 160 bit appointments again.This then is 24 bit forward error correction and 8 bit tail, then is the broadcast channel of 12 bits.Broadcast channel is made up of the section in each time slot of a frame, each time slot in this frame forms the down link common signaling channel that is sent by this base station together, and this broadcast channel includes control messages such as the link information of time slot table multiframe and superframe information, connectionless information and based on the out of Memory of this system operation.
During call setup, shown in Fig. 6 a, each downlink pilot timeslot comprises frequency correction data and is used for the initialized training sequence of receiver and only has short S field and do not have D field information.
Uplink time slot comprises two data of different types bags basically, as shown in Figure 5.The first kind is called direct packets, for example is used for the Aloha call request and allows auto-adaptive time to aim at (seeing Fig. 5 a) before connecting foundation.Another type data packets is called normal bag, uses when having set up and is a bigger packet calling out, because used auto-adaptive time aligning (seeing Fig. 5 b).
Each up link normally comprises the packet of 244 bits, it in front and also the back connect the inclination (ramp) of 4 bit durations.The remaining bits on this inclination and the 256 bit time slots left sides provide prevent since timing error from a protection of the interference that closes on time slot at interval.The timing that each subscriber unit is regulated its slot transmission arrives the used time of this base station with compensating signal.Each up link normal data packet comprises the synchrodata of 24 bits, after connect S field and D field as same number of bits in the normal time slot of each down link.
Each uplink pilot time slot comprises the vectoring information bag of 192 bit long, all tilts by having defined 60 bit protections that extend, 4 bits at interval in its front and back.This bigger protection needs at interval, because there is not available timing information, and should not protect at interval, and propagation delay will make adjacent time-slots disturbed.Direct packets comprise 64 bits synchronously, after connect the S field of 104 bits, the S field begins with 8 bit header and finishes with 16 bit cyclic redundancy, 2 reserved bit, 14 forward error correction FEC bits and 8 tail bits.There is not D field.
S field in the above-mentioned packet can be used for the signaling of two classes.The first kind is a MAC signaling (MS) and as the signaling between the MAC layer of the MAC layer of base station and subscriber unit, thereby timing is important.Second class is called relevant signaling, and it can slowly and be used for the base station of DLC or NWK layer and the signaling between the subscriber unit soon.
D field is maximum data field, and comprises the voice sample of numeral under the situation of normal telephone, but also can provide the non-voice data sample.
Use the query-response agreement to make stipulations at the optimum decision system that is used for the subscriber unit permission.Provide general encryption by the uncertain encryption bit sequence that produces with speech or data and by key stream generator is combined, this Hyper Frame Number of encrypting bit sequence and transmission is synchronous.
In addition, the signal of this transmission by out of order to remove component.
Auto-adaptive time is aimed at:
Time delay during the auto-adaptive time aligning is propagated by compensation can reduce the protection period between the normal uplink bag.
For a given subscriber unit, round-trip propagation delay (base station to the user to the base station) is regularly determined with down link by the timing that relatively receives bag in this base station.This subscriber unit is programmed in the transmission of time of being shifted to an earlier date by measured round trip propagation time in this base station, is received and receives bag in the corresponding time slot of being distributed being used for their exactly by this base station guaranteeing.
Do not have auto-adaptive time to aim at, the guard period that is allowed when using the normal uplink bag is not enough.Therefore, till the normal transmission of setting subscriber unit regularly, normal bag can not be sent out, because a danger is arranged: it will conflict mutually with the content of time slot subsequently.Under this situation, it is the uplink pilot bag of transmission.Short direct packets allows the guard period of a prolongation, it can correctly be received and does not require any adjusting of subscriber unit transmit timing.
The base station and the maximum magnitude between the subscriber unit that can use the uplink pilot bag of no timing advance to support approximately are 10 kilometers.Exceed this scope, then should come and go the guard period of timing above the prolongation of using shorter direct packets to provide is provided.But, for bigger scope, can provide another to preset timing advance (timing advance), this means the subscriber unit that can use farther.Preset and be added to the transmission of uplink pilot bag in advance, make in correct time slot, to receive the direct packets that is sent by this base station.This base station relatively receives the timing and down link timing of bag, and with this subscriber unit of programming in advance accordingly, this is called self adaptation in advance accordingly in advance.What be added to that up link normally wraps transmission total then shifts to an earlier date and this self adaptation shifts to an earlier date sum for presetting in advance.Always equal round trip propagation time in advance.
Accurate timing between up link and downlink packet relation is shown among Fig. 3 and timing with normal bag of up link that auto-adaptive time aims at is shown in Fig. 4.
Timing between up link bag and the downlink packet also utilize shown in Fig. 3 and 4, be used for uplink pilot bag and up link and normally wrap the timing slip t of the two and fixedly regulate.
Following parameter is given for auto-adaptive time and aims at:
The resolution t that self adaptation shifts to an earlier date
Adv=1 bit
Minimum self adaptation shifts to an earlier date t
Adv=0 bit
Maximum self adaptation shifts to an earlier date t
Adv=36 bits (≈ user is to base station 10km maximum magnitude)
Preset resolution t in advance
Preset=1 bit
Minimum presets t in advance
Preset=0 bit
Maximum total timing advance t this user
Adv+ t
Preset=104 bits
Preset timing advance and be programmed as the part of subscriber unit installation process, and if this subscriber unit be in the maximum magnitude 10km that only supports by change component, then be set at 0.
But outside this scope, the scope user who leaves the base station of its registration according to them can be grouped in the zone, and distributes to their corresponding bigger t in advance that presets
PresetAs follows:
| The zone | Minimum zone (Km) | Maximum magnitude (Km) | ??t Preset(bit) |
| ????A | ????0 | ????10 | ????0 |
| ????B | ????5 | ????15 | ????17 |
| ????C | ????10 | ????20 | ????34 |
| ????D | ????15 | ????25 | ????51 |
| ????E | ????20 | ????30 | ????68 |
Minimum zone is corresponding to by equaling t
Preset+ minimum t
AdvThe actual minimum zone supported of total timing advance; Maximum magnitude is corresponding to by equaling t
Preset+ maximum t
AdvThe actual maximum magnitude supported of total timing advance.
Claims (20)
- A control by second send with the predetermined time slot of receiving element in the regular length time frame in receive at least one first method that sends the transmit timing of the packet that comes with receiving element; wherein; Unit second sends a timing reference signal to first module; first module responds this signal transmission and has the sufficiently long protection first short relatively bag to guarantee that Unit second can receive at interval, and a value is determined according to the propagation delay of first time of reception that wraps in Unit second.And Unit second sends conditioning signal according to this value and regulates from the timing of transmission subsequently of the next long relatively bag of this subscriber unit to respond it to first module.
- 2. control transmission as claimed in claim 1 method regularly, wherein transmission is to utilize radio to carry out.
- 3. control transmission as claimed in claim 1 or 2 method regularly, wherein each first module is included in a subscriber unit of fixed location, and Unit second is a base station.
- 4. as the described control transmission of the arbitrary claim in front method regularly, wherein the protection of first bag at interval long enough with the reception that guarantees the base station and the propagation delay between base station and subscriber unit irrelevant.
- 5. as the described control transmission of the arbitrary claim in front method regularly, wherein the timing conditioning signal of subscriber unit is comprised first fixed component that the approximate distance according to subscriber unit and base station presets, and by measuring from the time of reception of first bag of subscriber unit and definite second component.
- 6. as the described control transmission of any claim of front method regularly, wherein in case determined that second component, this conditioning signal just send to subscriber unit and regulate so that be provided for the timing of packets of information subsequently.
- 7. as the described control transmission of any claim of front method regularly, wherein this first comprises system's control data and/or short message message.
- 8. as the described control transmission of any claim of front method regularly, wherein normally comprise system's control data and out of Memory, such as user data.
- A control by second send with the predetermined time slot of receiving element in the regular length time frame in receive from first and send and the timing control apparatus of the transmit timing of the packet that receiving element is next; wherein; Unit second comprises the timing reference signal transmitting device; and first module comprises responding device; it is used to respond the reception of timing reference signal and transmits and have the enough big protection first short relatively bag to guarantee that Unit second receives at interval; Unit second also comprises definite device; it is according to determining a value from the propagation delay of the first bag time of reception; and Unit second also comprises control device; it is used for sending conditioning signal to first module according to this value; first module also comprises adjusting device, and it is used to respond the timing of transmission subsequently that it regulates long relatively bag.
- 10. timing control apparatus as claimed in claim 9, wherein this control device sends the conditioning signal that comprises first fixed component and second component, and first fixed component is preset according to the approximate distance of first module and Unit second; And second component is determined from the transmission time of first bag of subscriber unit by measurement.
- 11. as claim 9 or 10 described timing control apparatus, wherein, Unit second comprises that a base station and first module are included in a subscriber unit of fixed location.
- 12. the method for the up link that sends in the time slot that a kind is adjusted in the regular length time frame and the timing of downlink packet comprises from base station transmission reference signal; Respond described reference signal and send the first short relatively bag from subscriber unit; Regularly come to determine regularly to regulate by the reception of base station from described first bag, and regulate according to described timing, a conditioning signal is sent to subscriber unit to regulate the timing of transmission subsequently of long relatively bag.
- 13. the method for a call setup, wherein send in the predetermined time slot in the regular length time frame, and wherein, in direct packets, send the aloha request that is used for call setup by subscriber unit, one direct packets is sent out in a period of time that the base station receives repeatedly than the relatively short direct packets of normal bag, if regularly regulate so that first direct packets when being received, makes the aloha request correctly be received and/or correctly determines.
- 14. method as claimed in claim 13, wherein, direct packets subsequently sends with different frequencies.
- 15. the interior transfer of data from the subscriber unit to the base station of a predetermined time slot method regularly that is controlled at the regular length time frame comprises that send an initial package from the base station to the subscriber unit, this initial package comprises timing data; And respond this timing data and regulate timing from the subscriber unit to the signal of base station.
- 16. the method for control data bag as claimed in claim 15 transmit timing, wherein the timing data from the base station to the subscriber unit comprises the fixed component that separates according to base station and subscriber unit.
- 17. as the method for claim 15 or 16 described control data bag transmit timings, wherein, timing data comprises the fixed variable component by measuring transmission time between base station and subscriber unit.
- 18. be used to be controlled at the timing control apparatus of the transmit timing of the TDMA packet from the subscriber unit to the base station in the predetermined time slot, the base station comprises and is used to send the device of an initial package to subscriber unit that initial package comprises timing data; And subscriber unit comprises the signal timing that signal transmitting apparatus and adjusting device are sent by signal transmitting apparatus with the adjusting of response timing data.
- 19. timing control apparatus as claimed in claim 18, wherein having setovers according to the timing of a fixed component of the distance of base station and subscriber unit regulates by applying.
- 20., wherein, regulate by adopting a variable componenent of deciding by the transmission time of measuring between base station and subscriber unit as claim 18 or 19 described timing control apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95195794 CN1161766A (en) | 1994-09-16 | 1995-09-08 | Transmission timing control in digital radio telephone |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9418749.9 | 1994-09-16 | ||
| CN 95195794 CN1161766A (en) | 1994-09-16 | 1995-09-08 | Transmission timing control in digital radio telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1161766A true CN1161766A (en) | 1997-10-08 |
Family
ID=5082990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95195794 Pending CN1161766A (en) | 1994-09-16 | 1995-09-08 | Transmission timing control in digital radio telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1161766A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039154B (en) * | 2006-03-15 | 2010-08-25 | 联芯科技有限公司 | Method for obtaining transceiver channel transmission time of user terminal |
| CN101083822B (en) * | 1999-06-01 | 2011-06-22 | 高通股份有限公司 | Improvement for wireless communication system |
| CN101103583B (en) * | 2005-01-12 | 2011-11-30 | 松下电器产业株式会社 | Wireless communication method, base station apparatus and mobile station apparatus |
-
1995
- 1995-09-08 CN CN 95195794 patent/CN1161766A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101083822B (en) * | 1999-06-01 | 2011-06-22 | 高通股份有限公司 | Improvement for wireless communication system |
| CN101103583B (en) * | 2005-01-12 | 2011-11-30 | 松下电器产业株式会社 | Wireless communication method, base station apparatus and mobile station apparatus |
| US8493961B2 (en) | 2005-01-12 | 2013-07-23 | Panasonic Corporation | Transmission timing control method, base station apparatus and mobile station apparatus |
| CN101039154B (en) * | 2006-03-15 | 2010-08-25 | 联芯科技有限公司 | Method for obtaining transceiver channel transmission time of user terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0782795B1 (en) | Transmission timing control in digital radio telephony | |
| EP0795255B1 (en) | Transmission of digital data messages in digital telephony | |
| MXPA97002009A (en) | Digi radiotelefony transmission time control | |
| EP0781495B1 (en) | Transmission of control messages in digital telephony | |
| EP0626769A2 (en) | Network synchronization for TDMA cellular communication using signals from mobile stations in neighboring cells | |
| US6044086A (en) | Control signal transmission in digital radio telephony | |
| CN101584137A (en) | A method and a device for enhanced performance in a cellular wireless TDD system | |
| US20030153320A1 (en) | System and method for providing contention channel organization for broadband satellite access in a communications network | |
| EP0860057B1 (en) | Method and apparatus for power control in a telephone system | |
| WO1997017768A9 (en) | Method and apparatus for power control in a telephone system | |
| WO1996008938A1 (en) | Method and apparatus for selection of a radio channel | |
| JP2000500303A (en) | Power control method and device in telephone system | |
| WO1997009795A1 (en) | Method and apparatus for synchronizing a fixed access unit into a tdma system | |
| CN1161766A (en) | Transmission timing control in digital radio telephone | |
| EP0867095B1 (en) | Enabling a subscriber unit in a radio network | |
| EP0860061B1 (en) | Digital telephony using control messages transmitted in time slots for rf frequency allocation | |
| EP0860060B1 (en) | Frequency assignment in a cellular telecommunications network | |
| CN1205814A (en) | Digital telephone using control messages transmitted in time slots for RF frequency allocation | |
| CN1205813A (en) | Frequency assignment in cellular telecommunications network | |
| WO1996035277A1 (en) | A method and apparatus for transmitting a digital data message according to a second frame format | |
| MXPA98003688A (en) | Digital telephony using control messages transmitted in time slots for frequency allocation | |
| CN1205811A (en) | Method and appts. for power control in a telephone system | |
| MXPA98003689A (en) | Allocation of frequency in a cellular telecommunications network | |
| CN1204440A (en) | Enabling subscriber unit in radio network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |