CA1241379A - Method of monitoring a radio link between a base station and a mobile station - Google Patents
Method of monitoring a radio link between a base station and a mobile stationInfo
- Publication number
- CA1241379A CA1241379A CA000443364A CA443364A CA1241379A CA 1241379 A CA1241379 A CA 1241379A CA 000443364 A CA000443364 A CA 000443364A CA 443364 A CA443364 A CA 443364A CA 1241379 A CA1241379 A CA 1241379A
- Authority
- CA
- Canada
- Prior art keywords
- mobile station
- radio
- counter
- base station
- messages
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012544 monitoring process Methods 0.000 title claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 39
- 238000004891 communication Methods 0.000 claims description 3
- 230000001702 transmitter Effects 0.000 claims description 2
- 230000001413 cellular effect Effects 0.000 claims 1
- 238000011156 evaluation Methods 0.000 abstract description 5
- 150000001875 compounds Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- QHGVXILFMXYDRS-UHFFFAOYSA-N pyraclofos Chemical compound C1=C(OP(=O)(OCC)SCCC)C=NN1C1=CC=C(Cl)C=C1 QHGVXILFMXYDRS-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
- H04B7/2678—Time synchronisation
- H04B7/2681—Synchronisation of a mobile station with one base station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
Landscapes
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Engineering & Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Radio Relay Systems (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Communication Control (AREA)
- Earth Drilling (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Aerials With Secondary Devices (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
Abstract
ABSTRACT:
Method of monitoring a radio link between a base station and a mobile station.
In radio transmission systems which are known the monitoring of a radio link between a base station and a mobile station is effected by means of an evaluation of the received field strength or of the sig-nal-to-noise ratio. This evaluation is not reliable in the case of a radio transmission system with a high number of transmission channels or in the case of radio zones which overlap to a considerable extent.
Radio messages are registered and evaluated in the base sta-tion in order to monitor an existing radio link.
Method of monitoring a radio link between a base station and a mobile station.
In radio transmission systems which are known the monitoring of a radio link between a base station and a mobile station is effected by means of an evaluation of the received field strength or of the sig-nal-to-noise ratio. This evaluation is not reliable in the case of a radio transmission system with a high number of transmission channels or in the case of radio zones which overlap to a considerable extent.
Radio messages are registered and evaluated in the base sta-tion in order to monitor an existing radio link.
Description
3~3 PHT 82.349 l 18.1l.1983 method of monitoring a radio link bett~en a base station and a mobile station.
The invention relates to a method of monitoring a radio link kett^~een a base station and a mobile station in a radio transmission system.
In accordance with technological developments knot~n to those involved, the radio transmission system consists of a hierarchically-arranged series of networks. The lowest level is made up of radio zones. The radius of these radio zones is, depending upon the height of the antenna masts of the base stations BS and at a n~Yim~n transmission power of 50 wa-tts, ketween 5 and 15 km. Each radio zone is served by a base station BS, which can connect calls through to or from the public telephone network via relay equipment. Several adjoining rcadio zones can ye combined into what is known a5 a paging area. At the base stations the locations of all the mobile stations MS are continuously registered and stored in an address book. If a mobile station MS changes -to another paging area, a corresponding change is made in the address book.
When a subscriker to a public telephone nett~rk wishes to n~ke a call to a mobile station a selective call is transml-tted to all the - radio zones of the paging area in which the mobile station is registered at that moment.
The transmitting and receiving frequency band is between 860 and 960 ~Hz, for instance. A duplex distance of 45 MHz between the transmittiny and -the receiving frequency band can be adopted, and the -transmitting and receiving frequency band can be subdivided into a channel spacing of 25 KHz. The channels are operated in the duplex mode.
According to the level of traffic, a number of traffic channels TCH for speech transmission and a-t least one control channel CCH are assigned to each radio zone in the radio transmission systern, different frequencies (control channels) being used in radio zones which are in proximity to one another. The control channel CCH and the traffic channel TCH have a special code to distinguish one from the other. In the event of a failure or interference on a control channel CCH each traffic channel TCH can take over the functions of the control channel CCH by 3~
Per 82.3~9 2 18.11.19~3 means of a change of code. It is hence possible to dispense with the duplication of control channels Cal, which ~uld otherwise be required for reasons of reliability.
A radio telephone system is known to us from DE-AS 25 50 26 in which nonitoring of the radio channels is carried out by means of an evaluation of the received field strength of a radio receiver. A
central station is provided with a buffer stage and a gated buffer. The buffer stage separates the transmitter voltage of dispersed fixed radio receivers, which is conveyed via a junction circuit, from the demodulated radio signal superimposed on i-t. In the gated buffer the fixed radio receiver with the highest HF field strength is connected through in the restitution and/or relay section of the central station for retrans-mission or relaying. As well as the fixed central station, ~7hich in-corporates a transmitter and at least two fixed radio receivers arranged in different positions, the radio telephone system has at least one mobile radio transmitter and receiver unit. The radio signal of the mobile radio transmltter and receiver unit can be received hy at least one of the Eixed radio receivers. Each fixed radio receiver incorporates a trcmsmitting apparatus for proclucing a transmitter voltage which i.s deI~endent upon the reception conditions of the fixed rad:io receiver -to w}1ich it belongs. Each transmi-tting apparatus produces a d.c. vol-tage proportionate to the received field strength of the fixed radio receiver to which it kelongs, this voltage serving the fixed cen-tral station as a basis for the monitoring of the radio channels in the manner descriked akove, with the use of a buffer and a gated buffer.
A disadvantage of this kind of radio transmission system (radio telephone system) is that in the evaluation of the received field strength it is not possible to distinguish ketween wanted signals (e.g. data and/or speech) and spurious signals (common channel inter-ference, image frequency effects, interfering transmitters). The re-ceived field strength is a compound signal made up of wanted and spurious signals, the ratio ketween the level of wanted signals and spurious signals not keing known. Wi-th an increase in the number of transmission channels in a radio transmission system there is a dis-proportionate increase in the spurious signals caused by the effectsof intermodulation. The thresholds for the release (clearing) of a transmission channel must no-t go below a certain minimum value. On the other hand, the minimum value which is adopted must not be too high, as
The invention relates to a method of monitoring a radio link kett^~een a base station and a mobile station in a radio transmission system.
In accordance with technological developments knot~n to those involved, the radio transmission system consists of a hierarchically-arranged series of networks. The lowest level is made up of radio zones. The radius of these radio zones is, depending upon the height of the antenna masts of the base stations BS and at a n~Yim~n transmission power of 50 wa-tts, ketween 5 and 15 km. Each radio zone is served by a base station BS, which can connect calls through to or from the public telephone network via relay equipment. Several adjoining rcadio zones can ye combined into what is known a5 a paging area. At the base stations the locations of all the mobile stations MS are continuously registered and stored in an address book. If a mobile station MS changes -to another paging area, a corresponding change is made in the address book.
When a subscriker to a public telephone nett~rk wishes to n~ke a call to a mobile station a selective call is transml-tted to all the - radio zones of the paging area in which the mobile station is registered at that moment.
The transmitting and receiving frequency band is between 860 and 960 ~Hz, for instance. A duplex distance of 45 MHz between the transmittiny and -the receiving frequency band can be adopted, and the -transmitting and receiving frequency band can be subdivided into a channel spacing of 25 KHz. The channels are operated in the duplex mode.
According to the level of traffic, a number of traffic channels TCH for speech transmission and a-t least one control channel CCH are assigned to each radio zone in the radio transmission systern, different frequencies (control channels) being used in radio zones which are in proximity to one another. The control channel CCH and the traffic channel TCH have a special code to distinguish one from the other. In the event of a failure or interference on a control channel CCH each traffic channel TCH can take over the functions of the control channel CCH by 3~
Per 82.3~9 2 18.11.19~3 means of a change of code. It is hence possible to dispense with the duplication of control channels Cal, which ~uld otherwise be required for reasons of reliability.
A radio telephone system is known to us from DE-AS 25 50 26 in which nonitoring of the radio channels is carried out by means of an evaluation of the received field strength of a radio receiver. A
central station is provided with a buffer stage and a gated buffer. The buffer stage separates the transmitter voltage of dispersed fixed radio receivers, which is conveyed via a junction circuit, from the demodulated radio signal superimposed on i-t. In the gated buffer the fixed radio receiver with the highest HF field strength is connected through in the restitution and/or relay section of the central station for retrans-mission or relaying. As well as the fixed central station, ~7hich in-corporates a transmitter and at least two fixed radio receivers arranged in different positions, the radio telephone system has at least one mobile radio transmitter and receiver unit. The radio signal of the mobile radio transmltter and receiver unit can be received hy at least one of the Eixed radio receivers. Each fixed radio receiver incorporates a trcmsmitting apparatus for proclucing a transmitter voltage which i.s deI~endent upon the reception conditions of the fixed rad:io receiver -to w}1ich it belongs. Each transmi-tting apparatus produces a d.c. vol-tage proportionate to the received field strength of the fixed radio receiver to which it kelongs, this voltage serving the fixed cen-tral station as a basis for the monitoring of the radio channels in the manner descriked akove, with the use of a buffer and a gated buffer.
A disadvantage of this kind of radio transmission system (radio telephone system) is that in the evaluation of the received field strength it is not possible to distinguish ketween wanted signals (e.g. data and/or speech) and spurious signals (common channel inter-ference, image frequency effects, interfering transmitters). The re-ceived field strength is a compound signal made up of wanted and spurious signals, the ratio ketween the level of wanted signals and spurious signals not keing known. Wi-th an increase in the number of transmission channels in a radio transmission system there is a dis-proportionate increase in the spurious signals caused by the effectsof intermodulation. The thresholds for the release (clearing) of a transmission channel must no-t go below a certain minimum value. On the other hand, the minimum value which is adopted must not be too high, as
2~L3~3 PHT 82.349 3 18.11.1983 otherwise the release of a transmission channel occurs frequently.
The problem underlying the invention is to indicate a method oE monitoring an existing radio link between a base station and a mobile station in such a Jay that an evaluation of the received field strength of the receiver concerned is not required.
This problem is solved by the features described in Claim 1.
The method on which the invention is based makes it possible to distinguish between poor transmission quality caused by radio shadow or by the large distance between the base station and the mobile station and poor transmisstion quality caused by a failure of a transmitter. In addition, the clearing of a traffic channel is made possible in a short period of time even under unfavourable transmitting conditions. From the monitoring of the number of messages a radio station (fixed or mobile ; station) knows the conditions indicating when a called station has switched off its transmitter or left -the transmission channel.
Advantageous ways of cleveloping the invention are describxd in the sub-cla:Lms.
The invention is explained and described in greater cletail below on the basis of an example tried in practice.
A radio link (existing transmission channel, i.e. traffic channel TCH or control channel CCH) exists between a mobile station MS
and a base station BS. The mobile station MS and the base station BS
register valid radio messages G and invalid radio messages U on the transmission channel.
A radio message can bx structured in the form of a frame synchronisation, an information block and a redundancy block. The frame synchronisation displays, for instance, a block length of 16 bit and precedes the information block. The beginning of a radio message can bx recognised in the station (MS, BS) on the basis of the frame sync'nroni-sation. The information block and the redundancy block can lx scrambled for the purpose of recognising and/or correcting errors. Witll a view to the simple processing of a radio message the block length of the free synchronisation, the information block and the redw~dancy block ; is an integral multiple of 8 bit. The radio message can also bx preceded by a preamble. The base station BS transmits a preamble with, for instance, 16 bit on a control channel CCH. On a traffic channel TCH a preamble is added only at the beginning of its occupation by base station BS and mobile station MS. Speech and data (with, for instance,
The problem underlying the invention is to indicate a method oE monitoring an existing radio link between a base station and a mobile station in such a Jay that an evaluation of the received field strength of the receiver concerned is not required.
This problem is solved by the features described in Claim 1.
The method on which the invention is based makes it possible to distinguish between poor transmission quality caused by radio shadow or by the large distance between the base station and the mobile station and poor transmisstion quality caused by a failure of a transmitter. In addition, the clearing of a traffic channel is made possible in a short period of time even under unfavourable transmitting conditions. From the monitoring of the number of messages a radio station (fixed or mobile ; station) knows the conditions indicating when a called station has switched off its transmitter or left -the transmission channel.
Advantageous ways of cleveloping the invention are describxd in the sub-cla:Lms.
The invention is explained and described in greater cletail below on the basis of an example tried in practice.
A radio link (existing transmission channel, i.e. traffic channel TCH or control channel CCH) exists between a mobile station MS
and a base station BS. The mobile station MS and the base station BS
register valid radio messages G and invalid radio messages U on the transmission channel.
A radio message can bx structured in the form of a frame synchronisation, an information block and a redundancy block. The frame synchronisation displays, for instance, a block length of 16 bit and precedes the information block. The beginning of a radio message can bx recognised in the station (MS, BS) on the basis of the frame sync'nroni-sation. The information block and the redundancy block can lx scrambled for the purpose of recognising and/or correcting errors. Witll a view to the simple processing of a radio message the block length of the free synchronisation, the information block and the redw~dancy block ; is an integral multiple of 8 bit. The radio message can also bx preceded by a preamble. The base station BS transmits a preamble with, for instance, 16 bit on a control channel CCH. On a traffic channel TCH a preamble is added only at the beginning of its occupation by base station BS and mobile station MS. Speech and data (with, for instance,
3~3 PHT 82.349 4 18.11.1983 150 bit/s in the upper band) can be transmitted on a traffic channel TCH. Only data with, for instance, 2.4 Kbit/s is transmitted on a control channel CCH. Radio messages can be transmitted in continuous succession or only at certain times to a changeable frame.
s A radio signal is recognised as valid, for instance, when the following conditions are met:
- There is not too much jitter Jitter can be recognised over a given period of time by transitions in level being detected in respect of time, averaged and evaluated.
During this period of time the jitter must not exceed a certain amount (phase). This affords protection against residual errors.
- Frame synchronisation recognised The received bits æe compared with a bit pattern specific to the radio transmission system. If there is an approximate correspondence lS between received and stored bit patterns, the frame synchronisation is regarded as recognised.
- Radio message must be decodeable after the frame synchronisation has been recognised, the received bits of the information block and the redundancy block are stored. The redundancy block can be used to recognise how many errors are contained in a radio message. If the number of errors exceeds a certain value, the radio message is regarded as not decodeable.
- Radio message must be in the frame The radio stations (MS, BS) know the time of a new radio message. The stations (MS, BS) check~whether the received radio message also meets the time requirement (appears in the frame).
If at least one of these conditions is not met, this radio message is classified as invalid. The radio stations (MS, BS) know that radio messages are continually transmitted on the transmission channel (TCH, CCH) and that the radio messages have a time pattern. A radio message, therefore, is also classified as invalid if the radio station (MS, BS) does not receive anything.
Case 1:
A radio link exists bet~7een mobile station MS and base station BS on the control channel CCH.
- If the counter in the mobile station r~s has reached the position NCC~
(= 16), the mobile station MS does not being a search for a control channel CCH.
PHT 82.349 5 18.11.1983 - If the mobile station receives a valid radio message G when the counter reading is between NCCHW (= 16) and NCCHSC (= 48), the counter is reset to zero and the mobile station MS can begin a search gain.
- When the counter reading NCCHSC (= 48) has been reached, the mobile station switches to a spare channel CCHSC assigned to the control channel CCH and checks whether a control channel message is being received on it.
This method makes it possible to distinguish between a break in communication caused by brief radio shadow and a break in communication caused by the failure of a control channel CCH.
Case 2:
A radio link exists between mobile station MS and base station BS on the traffic channel TCH.
- If the counter in the mobile station MS has reached the position NTXOF (= 4), the mobile station MS switches off its transmitter and continues to be assigned to this traffic channel TCH.
- If the mobile station receives NG (= 1) valid radio messages G when the cc~mter reading is between NTXOF (= 4) and NTCHR (= 25), it switches on its transmitter again and resets the ccNnter to zero.
- Len the counter reading NTCE-IR (= 25) is reached, the mobile sta-tion MS leaves the traffic channel TCH.
This rrethod makes it possible to clear a traffic channel TCH
from the called station (BS) within a short period of tirre (4 radio mlessages), as it is certain after this time that the rnobile station MS
has switched off its transmitter. After this period either the counter in the mobile station US has reached a position of at least NTXOF (= 4) or the mobile station MS has received one of NTXOF release messages.
This traffic channel TCH is thus available to other mobile stations MS.
If the m.obile station MS was not able to receive at least NTXOF radio rnessages, its transmitter is indeed switched off but the radio link is finally releæ ed only when the counter reading NTCHR
(- 25) has been reached. If as a result of radio shadow no radio messages are received, there is a strong likelihood that the mobile station MS has again left the radio shadow during this period and is receiving NG valid radio messages G.
Case 3:
-A radio lirk exists between a mobile station ITS and a base station BSon the traffic channel TCH.
P~-~ 82.349 6 18.11.1983 - If the counter in the base station BS has reached the position NF3SP(= 4), the station increases the transmitter power of its transmitter and feeds a command to the mobile station MS to increase the trans-mitter power of its transmitter.
S - When the counter reading NCONV (= 25) has keen reached, the base station BS transmits a maximum of NTXOF (= 4) release messages to the mobile station MS. Irrespective of the reception quality of the radio link in the mobile station MS, the traffic channel TCH is clear after this period.
s A radio signal is recognised as valid, for instance, when the following conditions are met:
- There is not too much jitter Jitter can be recognised over a given period of time by transitions in level being detected in respect of time, averaged and evaluated.
During this period of time the jitter must not exceed a certain amount (phase). This affords protection against residual errors.
- Frame synchronisation recognised The received bits æe compared with a bit pattern specific to the radio transmission system. If there is an approximate correspondence lS between received and stored bit patterns, the frame synchronisation is regarded as recognised.
- Radio message must be decodeable after the frame synchronisation has been recognised, the received bits of the information block and the redundancy block are stored. The redundancy block can be used to recognise how many errors are contained in a radio message. If the number of errors exceeds a certain value, the radio message is regarded as not decodeable.
- Radio message must be in the frame The radio stations (MS, BS) know the time of a new radio message. The stations (MS, BS) check~whether the received radio message also meets the time requirement (appears in the frame).
If at least one of these conditions is not met, this radio message is classified as invalid. The radio stations (MS, BS) know that radio messages are continually transmitted on the transmission channel (TCH, CCH) and that the radio messages have a time pattern. A radio message, therefore, is also classified as invalid if the radio station (MS, BS) does not receive anything.
Case 1:
A radio link exists bet~7een mobile station MS and base station BS on the control channel CCH.
- If the counter in the mobile station r~s has reached the position NCC~
(= 16), the mobile station MS does not being a search for a control channel CCH.
PHT 82.349 5 18.11.1983 - If the mobile station receives a valid radio message G when the counter reading is between NCCHW (= 16) and NCCHSC (= 48), the counter is reset to zero and the mobile station MS can begin a search gain.
- When the counter reading NCCHSC (= 48) has been reached, the mobile station switches to a spare channel CCHSC assigned to the control channel CCH and checks whether a control channel message is being received on it.
This method makes it possible to distinguish between a break in communication caused by brief radio shadow and a break in communication caused by the failure of a control channel CCH.
Case 2:
A radio link exists between mobile station MS and base station BS on the traffic channel TCH.
- If the counter in the mobile station MS has reached the position NTXOF (= 4), the mobile station MS switches off its transmitter and continues to be assigned to this traffic channel TCH.
- If the mobile station receives NG (= 1) valid radio messages G when the cc~mter reading is between NTXOF (= 4) and NTCHR (= 25), it switches on its transmitter again and resets the ccNnter to zero.
- Len the counter reading NTCE-IR (= 25) is reached, the mobile sta-tion MS leaves the traffic channel TCH.
This rrethod makes it possible to clear a traffic channel TCH
from the called station (BS) within a short period of tirre (4 radio mlessages), as it is certain after this time that the rnobile station MS
has switched off its transmitter. After this period either the counter in the mobile station US has reached a position of at least NTXOF (= 4) or the mobile station MS has received one of NTXOF release messages.
This traffic channel TCH is thus available to other mobile stations MS.
If the m.obile station MS was not able to receive at least NTXOF radio rnessages, its transmitter is indeed switched off but the radio link is finally releæ ed only when the counter reading NTCHR
(- 25) has been reached. If as a result of radio shadow no radio messages are received, there is a strong likelihood that the mobile station MS has again left the radio shadow during this period and is receiving NG valid radio messages G.
Case 3:
-A radio lirk exists between a mobile station ITS and a base station BSon the traffic channel TCH.
P~-~ 82.349 6 18.11.1983 - If the counter in the base station BS has reached the position NF3SP(= 4), the station increases the transmitter power of its transmitter and feeds a command to the mobile station MS to increase the trans-mitter power of its transmitter.
S - When the counter reading NCONV (= 25) has keen reached, the base station BS transmits a maximum of NTXOF (= 4) release messages to the mobile station MS. Irrespective of the reception quality of the radio link in the mobile station MS, the traffic channel TCH is clear after this period.
Claims (10)
1. A method of monitoring a radio link between a base station and a mobile station in a cellular radio communication system having a plurality of transmission channels and control channels, comprising:
continuous transmission by the base station of digital radio messages to the mobile station on a transmission channel in a predetermined pattern of time frames;
monitoring of the transmission channels by the mobile station for reception of valid radio messages having said predetermined pattern;
when valid messages having said predetermined pattern are received on a transmission channel by the mobile station, resetting the count of a counter comprised therein so as to thereby continue reception on such channel;
and when invalid messages or messages having other than said predetermined pattern are received on a transmission channel by the mobile station, increasing the count of the counter comprised therein so as to thereby switch the mobile station to another transmission channel;
the validity of a received message being determined by evaluating its jitter, time frame synchronization, redun-dancy, and conformity with its time frame.
continuous transmission by the base station of digital radio messages to the mobile station on a transmission channel in a predetermined pattern of time frames;
monitoring of the transmission channels by the mobile station for reception of valid radio messages having said predetermined pattern;
when valid messages having said predetermined pattern are received on a transmission channel by the mobile station, resetting the count of a counter comprised therein so as to thereby continue reception on such channel;
and when invalid messages or messages having other than said predetermined pattern are received on a transmission channel by the mobile station, increasing the count of the counter comprised therein so as to thereby switch the mobile station to another transmission channel;
the validity of a received message being determined by evaluating its jitter, time frame synchronization, redun-dancy, and conformity with its time frame.
2. A method in accordance with Claim 1, further com-prising:
continuous transmission by the mobile station of digital radio messages to the base station on a transmission channel in said predetermined pattern of time frames;
monitoring of the transmission channels by the base station for reception of valid radio messages having said predetermined pattern;
when valid messages having said predetermined pat-tern are received on a transmission channel by the base station, resetting the count of a counter comprised therein so as to thereby continue reception on such channel;
and when invalid messages or messages having other than said predetermined pattern are received on a transmission channel by the base station, increasing the count of the counter comprised therein so as to thereby switch the base station to another transmission channel.
continuous transmission by the mobile station of digital radio messages to the base station on a transmission channel in said predetermined pattern of time frames;
monitoring of the transmission channels by the base station for reception of valid radio messages having said predetermined pattern;
when valid messages having said predetermined pat-tern are received on a transmission channel by the base station, resetting the count of a counter comprised therein so as to thereby continue reception on such channel;
and when invalid messages or messages having other than said predetermined pattern are received on a transmission channel by the base station, increasing the count of the counter comprised therein so as to thereby switch the base station to another transmission channel.
3. A method in accordance with Claim 1, in which a transmission channel serves as a control channel and when the counter in the mobile station reaches a predetermined count NCCHWE one higher than that corresponding to such control channel, the mobile station continues reception on such con-trol channel.
4. A method in accordance with Claim 3, in which upon reception by the mobile station of a valid message in said predetermined pattern before the counter therein has reached a predetermined count NCCHSC, the mobile station resets the counter therein to thereby initiate a search for a control channel.
5. A method in accordance with Claim 4, in which when the counter in the mobile station reaches said count NCCHSC
the mobile station switches to a transmission channel which series as an alternate control channel and monitors such alternate control channel for reception of radio messages thereon.
the mobile station switches to a transmission channel which series as an alternate control channel and monitors such alternate control channel for reception of radio messages thereon.
6. A method in accordance with Claim 1, in which when the counter in the mobile station reaches a predetermined count NTXOF one higher than that corresponding to a particu-lar transmission channel the mobile station switches off a transmitter comprised therein and continues reception on such transmission channel.
7. A method in accordance with Claim 6, in which when valid messages in said predetermined pattern are received on said particular transmission channel the mobile station switches on the transmitter therein and resets the counter therein to thereby initiate a search for control channel.
8. A method in accordance with Claim 6, in which when the counter in the mobile station reaches a predetermined count NTCHR the mobile station leaves said particular trans-mission channel.
9. A method in accordance with Claim 2, in which when the counter in the base station reaches a predetermined count NBSP the base station increases the power of a trans-mitter therein and transmits a radio message to the mobile station to cause it to increase the power of a transmitter therein.
10. A method in accordance with Claim 2, in which when the counter in the base station reaches a predetermined count NCONV the base station transmits a plurality of release messages to the mobile station which cause it to release the transmission channel irrespective of the quality of reception thereon.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3246907.1 | 1982-12-18 | ||
| DE3246907A DE3246907C2 (en) | 1982-12-18 | 1982-12-18 | Method for monitoring a radio link existing between a fixed radio station and a mobile radio station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1241379A true CA1241379A (en) | 1988-08-30 |
Family
ID=6181034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000443364A Expired CA1241379A (en) | 1982-12-18 | 1983-12-15 | Method of monitoring a radio link between a base station and a mobile station |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP0111973B1 (en) |
| JP (1) | JPH0691488B2 (en) |
| AT (1) | ATE46802T1 (en) |
| AU (1) | AU2243983A (en) |
| BR (1) | BR8306906A (en) |
| CA (1) | CA1241379A (en) |
| DE (2) | DE3246907C2 (en) |
| DK (1) | DK578783A (en) |
| ES (1) | ES8407272A1 (en) |
| FI (1) | FI76657C (en) |
| NO (1) | NO162989C (en) |
| ZA (1) | ZA839204B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3721889A1 (en) * | 1987-07-02 | 1989-01-12 | Standard Elektrik Lorenz Ag | COMPUTER CONTROLLED SUBSCRIBER DEVICE FOR OPERATION IN TELECOMMUNICATION NETWORKS, IN PARTICULAR MOBILE RADIO NETWORKS, WITH DIFFERENT SYSTEM TECHNOLOGY |
| EP0615393A1 (en) * | 1993-03-10 | 1994-09-14 | Motorola, Inc. | A method for packet data transmission on a cellular voice network |
| DE4330705A1 (en) * | 1993-09-10 | 1995-03-16 | Sel Alcatel Ag | Mobile testing device |
| FI940705A (en) * | 1993-09-14 | 1995-03-15 | Nokia Telecommunications Oy | A method for monitoring base station radio channels |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2137653B2 (en) * | 1971-07-28 | 1979-08-16 | Robert Bosch Gmbh, 7000 Stuttgart | Method for transmitting data telegrams over a first radio path or voice information over a second radio path and device for carrying out the method |
| DE2333139A1 (en) * | 1973-06-29 | 1975-03-20 | Bosch Elektronik Gmbh | Radio communications network with central and mobile stations - has provision for short cut-out of long operating transmitter to reduce interference |
| US4027243A (en) * | 1975-05-12 | 1977-05-31 | General Electric Company | Message generator for a controlled radio transmitter and receiver |
| DE2550266B2 (en) * | 1975-11-08 | 1978-05-24 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Radiotelephone system and evaluation circuit for such a system |
| DE2659635B2 (en) * | 1976-12-30 | 1979-06-13 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Method for digital information transmission via radio |
| JPS5437601A (en) * | 1977-08-31 | 1979-03-20 | Hitachi Denshi Ltd | Channel trouble detection system |
| BE874400A (en) * | 1979-02-23 | 1979-08-23 | Chantrain Xaveer | RADIOMOBILE-TYPE TELECOMMUNICATIONS SYSTEM |
| US4309771A (en) * | 1979-07-02 | 1982-01-05 | Farinon Corporation | Digital radio transmission system |
-
1982
- 1982-12-18 DE DE3246907A patent/DE3246907C2/en not_active Expired
-
1983
- 1983-12-09 ZA ZA839204A patent/ZA839204B/en unknown
- 1983-12-14 EP EP83201768A patent/EP0111973B1/en not_active Expired
- 1983-12-14 AT AT83201768T patent/ATE46802T1/en not_active IP Right Cessation
- 1983-12-14 DE DE8383201768T patent/DE3380660D1/en not_active Expired
- 1983-12-15 JP JP58235209A patent/JPH0691488B2/en not_active Expired - Lifetime
- 1983-12-15 CA CA000443364A patent/CA1241379A/en not_active Expired
- 1983-12-15 DK DK578783A patent/DK578783A/en not_active Application Discontinuation
- 1983-12-15 AU AU22439/83A patent/AU2243983A/en not_active Abandoned
- 1983-12-15 FI FI834625A patent/FI76657C/en not_active IP Right Cessation
- 1983-12-15 BR BR8306906A patent/BR8306906A/en unknown
- 1983-12-16 NO NO834670A patent/NO162989C/en unknown
- 1983-12-16 ES ES528102A patent/ES8407272A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FI76657C (en) | 1988-11-10 |
| BR8306906A (en) | 1984-07-24 |
| DE3246907A1 (en) | 1984-06-20 |
| EP0111973B1 (en) | 1989-09-27 |
| AU2243983A (en) | 1984-06-21 |
| NO162989C (en) | 1990-03-14 |
| ES528102A0 (en) | 1984-08-16 |
| ATE46802T1 (en) | 1989-10-15 |
| NO834670L (en) | 1984-06-19 |
| DK578783A (en) | 1984-06-19 |
| FI834625A (en) | 1984-06-19 |
| EP0111973A3 (en) | 1986-05-28 |
| NO162989B (en) | 1989-12-04 |
| ZA839204B (en) | 1985-07-31 |
| DK578783D0 (en) | 1983-12-15 |
| ES8407272A1 (en) | 1984-08-16 |
| FI834625A0 (en) | 1983-12-15 |
| FI76657B (en) | 1988-07-29 |
| JPS59139735A (en) | 1984-08-10 |
| EP0111973A2 (en) | 1984-06-27 |
| DE3380660D1 (en) | 1989-11-02 |
| DE3246907C2 (en) | 1985-06-13 |
| JPH0691488B2 (en) | 1994-11-14 |
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