CN1213470A - Method for connecting mobile station to TDMA-based network - Google Patents
Method for connecting mobile station to TDMA-based network Download PDFInfo
- Publication number
- CN1213470A CN1213470A CN 97192995 CN97192995A CN1213470A CN 1213470 A CN1213470 A CN 1213470A CN 97192995 CN97192995 CN 97192995 CN 97192995 A CN97192995 A CN 97192995A CN 1213470 A CN1213470 A CN 1213470A
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- Prior art keywords
- dect
- radio
- tdma
- portable terminal
- ray path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to a method for connecting a portable terminal to a TDMA-based data transmission system, such as the DECT system. In the method portable terminals(PT)are connected to fixed parts of the system(FS)over a radio path(RP), via which successive TDMA frames are transmitted which are divided into successive time slots. To be able to easily and effectively combine the advantages of the fixed network and of the wireless network, a transmission path is arranged on the radio path from the two-wire line(WL)so that a)transmission in the two-wire line takes place in both directions simultaneously in frames the length of which essentially corresponds to that of the TDMA frame, and b)the time slots of the frames are formed of the data packets(PHL_P; MAC_P)that have been formed for the radio path in the portable terminal.
Description
The present invention relates to a kind of being used for is connected to the method based on the network of TDMA described in the preorder of appended claims 1 with portable terminal.Here, portable terminal is meant when being in prior ignorant position or the spendable telecommunication terminal that is used for mobile communication when it is mobile on every side.
This method of the present invention especially can be used in the DECT system, be used for portable DECT terminal is connected to the DECT system, but it also can be applicable to any other system based on TDMA.
A shortcoming of traditional fixed-line telephone network is, when a subscriber board (for example telephone set) when moving to the another location, must be that a telephone number is specified in this new position at telephone exchange.These change to the user and bring very big workload, and the user is meaned (adding) expense.
In the past, well-known mobile device and cellular network did not have above-mentioned shortcoming, and no matter where telephone set is in physically, telephone number wherein is constant.The telephone set of these systems also has user's particular card (for example SIM card), so that telephone set can be used as the user's that requirement is arranged subscriber board.
The telecommunication terminal of fixed network (for example telephone set) has at least following advantage to surpass the telecommunication terminal of cellular network:
-these telecommunication terminal reliable operations;
-these telecommunication terminals are from the network received power, and they are more reliable and more friendly to the user in this respect;
-because these telecommunication terminals are in certain position regularly, therefore can discern the information (user who for example charged and user) of relevant subscriber's line easily;
-speech quality very consistent all the time and
-do not exist by radio-ray path cause congested.
The purpose of this invention is to provide a kind of method, utilize this method can be as far as possible simply and effectively with above-mentioned advantage comprehensively in same subscriber board.Utilize this method of the present invention can reach this purpose, this method is characterized in that disclosed content in the characteristic of appended claims 1.
Basic thought of the present invention is, the fixing point-to-point type that uses the transmission of digital full-duplex data connected carry out branch, the radio-ray path of this connection and portable terminal walks abreast, and in an interface, realize branch, packet in this interface (pulse train) occurs with a kind of like this form basically, wherein they are sent to (preferentially being that needed possible chnnel coding of radio-ray path and/or channel replace or other similar measures in other words) in the needed processing procedure of radio-ray path.
Utilize this embodiment of the present invention, can obtain for example following advantage:
-do not need separation facilities for wireless and wired fixedly access,
-under various corresponding situations, can use one and same subscriber board in only (reliably) mode,
-subscriber board can be transformed into another fixed-line subscriber from a fixed-line subscriber connection and connect, and the user needn't do any change,
-no matter that set up by radio-ray path with being connected of this network or by fixedly connected foundation, can use same telephone number and
-because the user also can be connected to this network by a fixed interface, therefore can save radio-frequency spectrum.
Below, with reference to example shown in the drawings the present invention and preferred implementation thereof are described in more detail, wherein
Fig. 1 shows traditional DECT system,
Fig. 2 shows DECT of the present invention system,
Fig. 3 shows a kind of frame structure that uses on the radio-ray path in the DECT system,
Fig. 4 shows a kind of frame structure according to the system among the Fig. 2 that uses two-wire circuit,
Fig. 5 show be for the purpose of the present invention necessary portable DECT terminal those parts and
Fig. 6 shows the implementation of wired connection of the present invention.
In Fig. 1, a kind of reference model of DECT system has been described.(for the purpose of clear wash rice) used employed corresponding (English) term in the international standard (for example referring to list of references " ETSI; ETR 015; in March, 1991: ' Radio Equipment and Systems, Digital European Cordless Telecommunications (DECT) ' ") among the figure.
The DECT system can be connected to two kinds of networks:
-local network LN, for example subscriber exchange and
-global network GN is generally national net or international networks, for example public telephone network.
In the DECT reference model described in the standard, networking component is divided into two classes, portable terminal PT and fixed system FS.The assembly that fixed system is made up of all component of the fixation kit of representing the DECT network.These networking components (PT and FS) interconnect by radio-ray path.Fixed system FS can comprise many base stations (radio fixed part), but only contains a public control fixed part CCFP.
End system ES is connected to portable terminal PT, and this system comprises some employed application processing (telecommunication service).
In concept, the DECT system comprises three parts:
-sub-district, the user can move therein, and each sub-district all provides some to be used for controlling and managing the required function in described sub-district,
-one center system, this system comprise be used for all DECT of maintenance system connect necessary agreement and management function and
-one or more interworking units, this interworking unit carries on an agreement, and finishes format, and carries out the code conversion operation between DECT system and the system that is connected with it (for example public telephone network, ISDN net or GSM net),
Because the DECT system is well-known, will not be further described at this.Defined the DECT system in the ETS 300 175 of standard ETSI, interested reader can see therefrom that this system schemes in more detail.
Fig. 2 has illustrated how the present invention changes the reference model that proposes among Fig. 1.According to the present invention, a kind of by adopting (copper) two-wire circuit, in other words, by adopting in a kind of and the plain old telephone that fixed-line telephone network links to each other similarly transmission medium, the wire transmission path WL that arranges another and radio-ray path RP between portable terminal and the fixed system to walk abreast.Therefore, portable DECT terminal not only can but also can be connected to this fixed system by Wireline (local loop) by radio-ray path.Portable terminal PT is equipped with a parts W1 who is used for wireless access, and these parts realize with a kind of method of the routine for the DECT dedicated radio link, and a concurrent section W2 who is used for wired access is housed, and these parts are responsible for and being connected of two-wire circuit.
It is used that the frequency band of 20MHz between 1880MHz...1900MHz is specialized in this DECT system.On this frequency band, be spaced apart 1.728MHz between the RF channel (carrier wave).Average transmit power only is 10mW, and this helps working long hours, and simultaneously from another point of view, has reduced the price of this telephone set.
In Fig. 3, a kind of a kind of frame structure that uses has been described on DECT radio-ray path RP.The length of one frame is 10ms, comprises 24 continuous time slot (0 ... 23), wherein preceding 12 time slots specialize in from the fixed system to the portable terminal that (transmission of F → P) is used, and back 12 time slots specialize in from the portable terminal to the fixed system that (transmission of P → F) is used.Therefore, utilize so-called MC-TDMA/TDD principle (multicarrier time-division multiple access connection/time division duplex) thus form the physical channel of DECT system.The length of a time slot is 416.7 μ s.The length of the pulse train that sends in a time slot is 364.6 μ s, wherein amounts to 420 bits.This pulse train constitutes a bag (PHL bag) of the physical layer of DECT system, is marked with reference marker PHL P.This pulse train comprises the synchronization field SYNC of one 32 bit and the follow-up data field DATA of one 388 bit.This data field comprises a bag (MAC bag) of the MAC layer (media interviews control) of DECT system, is marked with reference marker MAC_P.Figure 3 illustrates a data field in the time for example during ordinary call, will being used.This data field is divided into two parts, A and B.At field A, send the information of signaling channel (C), the information of the information of broadcast channel (Q) and paging channel (P).Therefore, the transmittability (4.8kbit/s) of these Channel Sharing fields A.It is used that the remainder CRC of field A (16 bit) specializes in the error control of data.At field B, user profile (I-channel) is sent out with the long bursts of 320 bits.The remainder X of field B (4 bit) is defined by some bits of I-channel, and is used to detect interference.
In two-wire circuit of the present invention, used basically and the similar a kind of frame structure of the frame structure of radio-ray path, but in this method, transmitted simultaneously at two sending directions.(this embodiment is based on a kind of ECT echo cancellation technique, and this will be for a more detailed description in conjunction with Fig. 5).Fig. 4 shows a kind of frame structure that is used in two-wire circuit.In two sending directions, frame length is 10ms, and this frame preferably includes 12 continuous time slot, and in its each time slot, (best) sends a bag PHL_P of the physical layer of DECT system.In this method, in two sending directions, can both reach the speed that is approximately 504kbit/s.Though (among the figure physical layer each the bag PHL_P end distributed safety time, this safety time is dispensable in the transmission via two-wire circuit).By using full duplex transmission, can make that the spectral bandwidth of two-wire circuit is narrow as far as possible by means of ECT echo cancellation technique.
Among Fig. 5, those parts of the portable DECT terminal PT relevant with the present invention have been described.Starting point is that point that individual interface is arranged in portable terminal all the time, can send these DECT bags (the preferably bag of physical layer) by this interface in two sending directions.This interface has been marked with reference marker PI.The packing of these bags and depacketizing carry out in unit 51, and the bag that this unit will arrive is disassembled into and the corresponding bit stream of each channel (I, P, C and Q), and on sending direction these bit streams is packed.According to the present invention, in above-mentioned interface, arranged a selected cell 52, will be connected to the pattern of the fixed part of network in order to select terminal, in other words, be to insert by radio-ray path or by two-wire circuit.The selection signal of access module has been marked with reference marker CTRL.This selected cell will be packed and the depacketizing unit is connected to the RF subsystem W1 of fixed system or is connected to the subsystem W2 of fixed system, have one or more two-wire circuit WL to link to each other with this subsystem W2 successively.
Among Fig. 6, the structure of subsystem W2 has been described.Frame as Fig. 4 is made of the bag PHL_P in the sending direction in unit 61, and these frames are fed in the modulator/demodulator parts 62.These modulator/demodulator parts adopt the modulator approach of (copper) two-wire circuit of a kind of being suitable for, as QAM or 281Q modulation.Send signal and not only be fed into adaptive echo eliminator unit 63 but also be fed into two-wire circuit WL via hybrid network 64 from modulator.This hybrid network is finished conversion from paired cable heart line to four cable cores with a kind of well-known mode.
The signal RX that receives is connected to echo eliminator unit 63 via hybrid network, and this unit is eliminated from the signal that receives and sent the relevant composition (echo) of signal.The signal that obtains like this carries out demodulation in unit 62, and tears frame open in unit 61.At the end of fixed system, have one basically with portable terminal in the similar subsystem W2 of subsystem.At fixed system FS end, two-wire circuit not only can be connected to the radio fixed part but also can be connected to a public control fixed part CCFP.
Here not for a more detailed description to subsystem W1, because it is realized with a kind of well-known mode.
Describe a kind of method above, utilized this method, in the time slot of two-wire circuit, sent a bag of the physical layer of DECT system.As much as possible aspect existing DECT system compatible, this be one preferred embodiment.In this time slot, also can send the bag of MAC layer, in view of the above, for example can before this frame, synchronous mode be set.Although an embodiment like this requires that bigger change is arranged in the prior art, this still is a kind of embodiment with more advantages for transmittability.
Although above reference according to corresponding figures for example narrated the present invention, obviously the present invention is not limited thereto, in the design philosophy scope of the present invention that is disclosed in claims subsequently, can be out of shape by different way.Although above with the DECT system as an example, yet that this method can be applicable to is any similarly based on the system of TDMA.
Claims (4)
1. one kind is used for portable terminal is connected to based on the transmission system of TDMA such as the method for DECT system, in the method
-portable terminal (PT) links to each other with the fixed part of system (FS) by radio-ray path (RP), by this radio-ray path, sends the continuous T DMA frame that is divided into continuous slot,
It is characterized in that
-from the parallel two-wire circuit (WL) of radio-ray path transmission channel of arrangement so that
Transmission in the-two-wire circuit is carried out on both direction simultaneously with the frame form, and the length of frame is equivalent to the length of tdma frame basically, and
The time slot of-these frames is by those packets (PHL_P that forms for radio-ray path in portable terminal; MAC_P) constitute.
2. the method for claim 1 is characterized in that timeslot number in the frame is equivalent to the timeslot number in the tdma frame used in single sending direction.
3. the method for claim 1 is used for portable DECT terminal is connected to the DECT system, and the time slot that it is characterized in that these frames is made of the packet of the physical layer that forms by radio-ray path.
4. method as claimed in claim 2 is used for portable DECT terminal is connected to the DECT system, it is characterized in that two-wire circuit is connected to the public control fixed part CCFP of DECT system from portable terminal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI961207 | 1996-03-14 | ||
| FI961207A FI102935B1 (en) | 1996-03-14 | 1996-03-14 | Method of connecting a mobile terminal to a TDMA barred network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1213470A true CN1213470A (en) | 1999-04-07 |
Family
ID=8545663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97192995 Pending CN1213470A (en) | 1996-03-14 | 1997-03-13 | Method for connecting mobile station to TDMA-based network |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0878066A2 (en) |
| CN (1) | CN1213470A (en) |
| AU (1) | AU1928397A (en) |
| FI (1) | FI102935B1 (en) |
| WO (1) | WO1997034378A2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322689C (en) * | 2001-10-16 | 2007-06-20 | 艾利森电话股份有限公司 | Integration of a fiber optic fixed access and a fibre optic radio access network |
| CN102870368A (en) * | 2012-06-20 | 2013-01-09 | 华为技术有限公司 | OFDM-TDMA-based bidirectional service processing method and communication device |
| CN101065948B (en) * | 2004-11-24 | 2013-10-16 | 皇家飞利浦电子股份有限公司 | An internet-protocol based telemetry patient monitoring system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3434686A1 (en) * | 1984-09-21 | 1986-04-03 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Cordless telephone |
| JPH03109848A (en) * | 1989-09-25 | 1991-05-09 | Hitachi Ltd | Communication system |
-
1996
- 1996-03-14 FI FI961207A patent/FI102935B1/en active
-
1997
- 1997-03-13 WO PCT/FI1997/000166 patent/WO1997034378A2/en not_active Application Discontinuation
- 1997-03-13 EP EP97907120A patent/EP0878066A2/en not_active Withdrawn
- 1997-03-13 CN CN 97192995 patent/CN1213470A/en active Pending
- 1997-03-13 AU AU19283/97A patent/AU1928397A/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322689C (en) * | 2001-10-16 | 2007-06-20 | 艾利森电话股份有限公司 | Integration of a fiber optic fixed access and a fibre optic radio access network |
| CN101065948B (en) * | 2004-11-24 | 2013-10-16 | 皇家飞利浦电子股份有限公司 | An internet-protocol based telemetry patient monitoring system |
| CN102870368A (en) * | 2012-06-20 | 2013-01-09 | 华为技术有限公司 | OFDM-TDMA-based bidirectional service processing method and communication device |
| CN102870368B (en) * | 2012-06-20 | 2016-03-09 | 华为技术有限公司 | Based on processing method and the communication equipment of OFDM-TDMA two-way services |
| US9838073B2 (en) | 2012-06-20 | 2017-12-05 | Huawei Technologies Co., Ltd. | Processing method based on OFDM-TDMA two-way service and communications device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997034378A2 (en) | 1997-09-18 |
| FI102935B (en) | 1999-03-15 |
| EP0878066A2 (en) | 1998-11-18 |
| FI102935B1 (en) | 1999-03-15 |
| AU1928397A (en) | 1997-10-01 |
| FI961207A0 (en) | 1996-03-14 |
| WO1997034378A3 (en) | 1997-11-06 |
| FI961207A (en) | 1997-09-15 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |