WO2002001898A1 - Digital radio and digital radio communication system - Google Patents
Digital radio and digital radio communication system Download PDFInfo
- Publication number
- WO2002001898A1 WO2002001898A1 PCT/EP2001/007270 EP0107270W WO0201898A1 WO 2002001898 A1 WO2002001898 A1 WO 2002001898A1 EP 0107270 W EP0107270 W EP 0107270W WO 0201898 A1 WO0201898 A1 WO 0201898A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mobile station
- signalling
- receive
- repeater
- digital
- Prior art date
Links
Classifications
-
- 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
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
Definitions
- the present invention relates to the field of digital radios and digital radio communication systems.
- Two-way' digital portable and mobile radios may be arranged either to communicate with one another via base stations, or directly with one another in 'direct mode'.
- the communication will typically either be over a digital simplex communication channel, or over a digital semi-duplex communication channel.
- FIG 1 illustrates the general scheme of a personal mobile radio (PMR) system 10.
- Portable radios 2, 4 and 6 of figure 1 can communicate with a base station 8.
- Radios 2, 4 and 6 could equally well be mobile radios mounted in vehicles.
- Each of the radios shown in figure 1 can communicate through base station 8 with one or more other radios. If radios 2, 4 and 6 are capable of direct mode operation, then they may communicate directly with one another or with other radios, without the communication link passing through base station 8.
- MS mobile station'
- a mobile station may employ a regular payload framing structure.
- This structure consists of a structure of fixed time points at which parts of the communication begin and end.
- Such a payload framing structure may allow either 'transmit interrupt' and/or 'reverse signalling' to occur.
- Transmit interrupt and reverse signalling time periods are periods when a transmitting radio briefly stops transmitting, thereby allowing the transmitting radio to receive a signal from another radio.
- 'return signalling' will be used for 'transmit interrupt' and/or 'reverse signalling .
- Prior art radio systems have various arrangements that allow receipt of return signalling from a listening radio.
- the problem to be solved by this invention may occur, in general, with any radio system that needs to allow return signalling.
- the problem is explained below by reference to the Transmitter Interrupt / Reverse Signalling scenario for a DIIS radio system.
- the invention is explained in relation to 'Peer to Peer' DIIS systems employing a re- clocking repeater.
- the invention is however not limited to the DIIS system.
- the system considered below consists of mobile stations.
- MS 'A' and MS 'B' are in communication together through a repeater.
- the repeater is referred to as 'Re' in the figures.
- the mobile stations and the repeater may either be in transmit mode, that is referred to as Tx' in the figures, or be in receive mode, that is referred to as 'Rx' in the figures.
- mobile station A is in the process of transmitting a payload of information to mobile station B via a re-clocking repeater Re, with regular gaps for possible Transmitter Interrupt (Tl) or Reverse Signalling (RS).
- Tl Transmitter Interrupt
- RS Reverse Signalling
- Re-clocking repeaters have a "propagation delay" of up to 7ms. In the future, this delay is likely to be reduced by improved technology and implementation processes, but will never be eliminated.
- Reverse Signalling and Transmitter Interrupt signalling telegrams are of a standard 107 symbol length and are preceded by a Full Synchronisation sequence (FSS) and 7 pilot symbols.
- FSS Full Synchronisation sequence
- the first symbol from MS B will now be delayed by the repeater and path delays of 7.5ms before it reaches MS A receiver, 20.5ms after the start of the TI/RS period. See point B on figure 2.
- the length of the transmission from B to A is governed by the need for MS A to switch back to Transmit in order to resume its payload transmission. This must happen no later than 5.5ms before the end of the TI/RS period.
- the down-link channels in the GSM and Tetra systems provide advance timing parameters to subscribers. This is controlled by the base-station.
- a digital mobile station for use in a digital radio communications system that allows return signalling and incorporates at least one repeater.
- the digital mobile station of the invention comprises: means for signal transmission; means for signal reception; means for calculating a time range for transmitting return signalling, the means for calculating the time range being adapted to:
- the means for calculating the time range for transmitting return signalling may be adapted to calculate, as the earliest possible time for transmitting return signalling, the time at which the mobile station transmitting a payload is just able to receive the last symbol of the TI/RS prior to commencing the transition between receive (Rx) and transmit (Tx) operation.
- the means for calculating the time range for transmitting return signalling may be adapted to calculate, as the latest possible time for transmitting return signalling, the time at which the digital mobile station can just receive the last symbol of the payload prior to commencing the transition between receive (Rx) and transmit (Tx) operation.
- the means for calculating the time range for transmitting return signalling may assume a worst-case value for the settling times, between transmit (Tx) and receive (Rx) operation, and between receive (Rx) and transmit (Tx) operation, of the mobile station transmitting the payload.
- the digital radio communications system allows return signalling, and comprises:
- the invention optimises transmit interrupt signalling and/or reverse signalling in a digital radio and a digital radio communications system.
- Figure 1 illustrates an arrangement of portable and/or mobile radios and a base station.
- Figure 2 illustrates a signalling sequence which may occur in a digital radio system.
- FIG. 3 illustrates a mobile station in accordance with the present invention.
- FIGS 4-6 illustrate signalling sequences which may occur with mobile stations and digital radio communication systems in accordance with the invention.
- the invention solves the problems of prior art digital radios and radio systems employing Transmitter Interrupt / Reverse Signalling, by allowing the MS that is sending the Transmitter Interrupt / Reverse
- this invention can also ensure interoperability with the MS transmitting the payload, by assuming the worst case Rx to Tx & Tx to Rx settling times for the MS transmitting the payload.
- the invention provides a mechanism for minimising the information loss resulting from the combined effect of a repeater delay and mobile station Rx to Tx & Tx to Rx settling time, when transmitting Transmitter Interrupt / Reverse Signalling within a Peer to Peer type Network employing a regular Superframe Structure.
- the invention relies on the repeater broadcasting its delay, and the mobile station transmitting the TI/RS being aware of its own Rx to Tx & Tx to Rx settling time. Based on these two figures, the Mobile Station transmitting the TI/RS then calculates a range across which it may advance the TI/RS transmission in order to control and minimise the information loss.
- the earliest possible position corresponds to the point at which the Mobile transmitting the Payload is just able to receive the last symbol of the TI/RS, prior to it commencing the Rx-Tx transition.
- the latest possible position corresponds to the point at which the mobile station transmitting the TI/RS is just able to receive the last symbol of the payload, prior to it commencing the Rx-Tx transition.
- the Rx to Tx & Tx to Rx settling time of the mobile station transmitting the payload is here assumed to be "worst case”.
- the mobile station transmitting the TI/RS will miss the last part of the payload. For DIIS, this is 10ms. For worst case at the other extreme, the mobile station transmitting the payload will miss the last part of the TI/RS. For DIIS, this is also 10ms.
- the mobile station transmitting the TI/RS is able to optimise the trade-off between loss in payload and potential for success of the TI/RS. This takes into account the relative importance of the payload vs. TI/RS integrity, and the ability to mitigate the losses to some extent by the use of techniques such as interleaving, redundancy and erasures etc.
- an advantage of this invention is that it allows the mobile station to optimise the trade-off between payload and TI/RS in line with any future improvements in repeater and mobile station performance. So, if a repeater with a lower delay time becomes available in future, the invention will be able to take advantage of this.
- Figure 3 illustrates a mobile station in accordance with the present invention.
- the mobile station of figure 3 may be either a portable- or a mobile digital radio.
- the radio 2 of figure 3 can transmit speech from a user of the radio.
- the radio comprises a microphone 34 which provides a signal for transmission by the radio.
- the signal from the microphone is transmitted by transmission circuit 22.
- Transmission circuit 22 transmits via switch 24 and antenna 26.
- Radio 2 also has a controller 20 and a read only memory (ROM) 32.
- Controller 20 may be a microprocessor.
- ROM 32 is a permanent memory, and may be a non-volatile Electrically Erasable Programmable Read Only Memory (EEPROM).
- EEPROM Electrically Erasable Programmable Read Only Memory
- the radio 2 of figure 3 also comprises a display 42 and keypad 44, which serve as part of the user interface circuitry of the radio. At least the keypad 44 portion of the user interface circuitry is activatable by the user. Voice activation of the radio, or other means of interaction with a user, may also be employed.
- Signals received by the radio are routed by the switch to receiving circuitry 28. From there, the received signals are routed to controller 20 and audio processing circuitry 38.
- a loudspeaker 40 is connected to audio circuit 38. Loudspeaker 40 forms a further part of the user interface.
- a data terminal 36 may be provided. Terminal 36 would provide a signal comprising data for transmission by transmitter circuit 22, switch 24 and antenna 26.
- the digital radio communication system of the invention has the same overall configuration as the system shown in Figure 2.
- the repeater of the invention may broadly resemble the base station shown in Figure 1 as element 8, although a repeater may not have all the features of a full base-station.
- An MS making an emergency Transmitter Interrupt will calculate the latest possible time to start transmission, from the repeater broadcast delay parameter and its own Tx-Rx-Tx delay parameters. See Figure 4, point A. This will both ensure no impact on other listeners on the channel, and ensure the minimum loss of payload and the maximum probability of success for the Tl.
- Reverse Signalling is permitted to be delayed, so that some of the payload from MS A and some of the Reverse Signalling is lost, as shown in Figure 5. This may have advantages if faster repeaters and mobiles are in use, and this permits a small number of erasures being used to recover both MS A and MS B signalling.
- An MS is permitted to use intermediate cases between those shown in figures 4 and 5, to optimise the balance between received payload and signalling performance.
- the loss of payload/signalling is related to the
- Loss (ms) 2*(RE delay) + (MS Rx to Tx Delay) - 9.5
- Examples 2, 3 & 4 are probably recoverable, by exploiting the properties of the error correction code. This is especially likely if the MS chooses to split the overlap into two as shown in Figure 5, or some intermediate value.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01947403A EP1302086A1 (en) | 2000-06-27 | 2001-06-26 | Digital radio and digital radio communication system |
AU69093/01A AU6909301A (en) | 2000-06-27 | 2001-06-26 | Digital radio and digital radio communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0015769.3 | 2000-06-27 | ||
GB0015769A GB2364204B (en) | 2000-06-27 | 2000-06-27 | Digital radio and digital radio communications system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002001898A1 true WO2002001898A1 (en) | 2002-01-03 |
Family
ID=9894532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/007270 WO2002001898A1 (en) | 2000-06-27 | 2001-06-26 | Digital radio and digital radio communication system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1302086A1 (en) |
AU (1) | AU6909301A (en) |
GB (1) | GB2364204B (en) |
WO (1) | WO2002001898A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4573207A (en) * | 1983-12-22 | 1986-02-25 | Motorola, Inc. | Queued community repeater communications system |
US5617412A (en) * | 1994-04-15 | 1997-04-01 | Alcatel N.V. | Frame/multiframe structure FDMA system and corresponding signal |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2301734B (en) * | 1995-05-31 | 1999-10-20 | Motorola Ltd | Communications system and method of operation |
-
2000
- 2000-06-27 GB GB0015769A patent/GB2364204B/en not_active Expired - Fee Related
-
2001
- 2001-06-26 WO PCT/EP2001/007270 patent/WO2002001898A1/en active Application Filing
- 2001-06-26 EP EP01947403A patent/EP1302086A1/en not_active Withdrawn
- 2001-06-26 AU AU69093/01A patent/AU6909301A/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4573207A (en) * | 1983-12-22 | 1986-02-25 | Motorola, Inc. | Queued community repeater communications system |
US5617412A (en) * | 1994-04-15 | 1997-04-01 | Alcatel N.V. | Frame/multiframe structure FDMA system and corresponding signal |
Also Published As
Publication number | Publication date |
---|---|
GB0015769D0 (en) | 2000-08-16 |
GB2364204A (en) | 2002-01-16 |
EP1302086A1 (en) | 2003-04-16 |
AU6909301A (en) | 2002-01-08 |
GB2364204B (en) | 2003-03-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR100866334B1 (en) | Apparatus and method for supporting multi link in multi-hop relay cellular network | |
US8416761B2 (en) | Mitigating synchronization loss | |
CN1890927B (en) | Preemptive dynamic frequency selection | |
US8036137B2 (en) | Methods and apparatus for supporting a half-duplex mode of operation for user equipment communications in a radio communication system | |
CN101507134B (en) | Increasing the capacity of a channel in a communications system by means of predetermined time offsets | |
WO2007012264A1 (en) | Transmission method for a time division duplex mobile communication system | |
CA2480402A1 (en) | Method for transmitting high-speed downlink package data in mobile communication system with smart antenna | |
US8867983B2 (en) | Method and apparatus for controlling a relay station in a multi-hop relay network | |
US20080285473A1 (en) | Access and backhaul frame interlacing from time division duplex wireless communication system | |
JP2000069550A (en) | Time slot assignment method and its system | |
JPH10513330A (en) | Digital telecommunications system | |
KR20180072822A (en) | Method and apparatus for communication using multiple TTI structures | |
CN101841906B (en) | Method and base station for transmitting frames synchronously | |
CN1964222B (en) | A system and method for wireless transfer communication | |
US6801754B2 (en) | Intelligent repeater and method to provide increased signaling | |
US7693094B2 (en) | Apparatus for bidirectional communication using auxiliary band in wireless communication system | |
JP3266342B2 (en) | Wireless relay method and wireless relay device using the method | |
WO2003026335A1 (en) | Mobile communication system, mobile station and base station | |
KR101712914B1 (en) | Method and apparatus of relaying operation using uplink resource | |
EP1302086A1 (en) | Digital radio and digital radio communication system | |
CN107241810B (en) | Scheduling method and sending method of uplink data, base station and user equipment | |
EP1022868A4 (en) | Mobile communication system and mobile communication method | |
EP2269351B1 (en) | Tetra DMO range extension | |
US6693968B1 (en) | Digital portable or mobile radio | |
WO2004071018A3 (en) | Scheduling of signaling messages in a wireless tdma-based communication system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2001947403 Country of ref document: EP |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 2001947403 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
NENP | Non-entry into the national phase |
Ref country code: JP |