EP1216584A1 - Routing redundancy method in a point to multipoint radio system for an access terminal - Google Patents

Routing redundancy method in a point to multipoint radio system for an access terminal

Info

Publication number
EP1216584A1
EP1216584A1 EP00944186A EP00944186A EP1216584A1 EP 1216584 A1 EP1216584 A1 EP 1216584A1 EP 00944186 A EP00944186 A EP 00944186A EP 00944186 A EP00944186 A EP 00944186A EP 1216584 A1 EP1216584 A1 EP 1216584A1
Authority
EP
European Patent Office
Prior art keywords
radio node
routing
access terminal
alternative
redundancy
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.)
Withdrawn
Application number
EP00944186A
Other languages
German (de)
French (fr)
Inventor
Andrea Nascimbene
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to EP00944186A priority Critical patent/EP1216584A1/en
Publication of EP1216584A1 publication Critical patent/EP1216584A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/14—WLL [Wireless Local Loop]; RLL [Radio Local Loop]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus

Definitions

  • This invention relates to an access terminal re-routing redundancy capability for point-multipoint systems. BACKGROUND OF THE INVENTION
  • RNs radio nodes
  • the invention faces the problem with a totally different, new and original approach, by proposing a high redundancy configuration, which is based just on the capacity of an access terminal (AT) of a subscriber to be switched from the home radio node (home RN) - when it is inserted in the normal traffic condition - to a host radio node (host RN) - which is in this way allocated, upon failures, to other access terminals (AT) which are in the same sector and having the possibility of bearing an additional traffic.
  • AT access terminal
  • home RN home radio node
  • host RN host radio node
  • the invention relates to access terminal re-routing redundancy capability in point-multipoint radio communication systems, consisting of giving an access terminal the feature to automatically and autonomously switch from a radio node, to which it is normally connected, to an alternative radio node, usually not dedicated to the redundancy functionality and independently located in the same or in other hubs.
  • a logic of switch and redundancy is provided in the access terminal, which is apt to automatically switch to the alternative radio node (host) upon failure in the connection which normally operates between the terminal itself and the home radio node, while the alternative (host) radio node has the capability to be allocated to other access terminals, which are located in the same sector and has the possibility to bear an additional traffic.
  • the alternative radio node when the alternative radio node is located in a radio node different from the one where is the radio node with respect to which it has been switched from the access terminal, the latter is provided with two antennas, which are directed towards said two different hubs, and with a two-ways radio frequency switch or with a single antenna with electronically routed beams.
  • Fig. 1 shows, as above mentioned, the scheme of a typical radio communication system to which the present invention applies;
  • Fig. 2 is a scheme showing a first way to carry out the invention
  • Fig. 3 is a scheme showing a second way to carry out the invention.
  • the invention comprises a hub 1 , which accommodates a number of radio nodes (RN) 2, 3, ...Y, each controlled by a control unit 4, 5, ...Z of the node, and a management system (MS) 6.
  • RN radio nodes
  • MS management system
  • the subscriber terminal (AT) 7 is connected to the home radio node (home RN) 2, namely it is inserted in a normal traffic condition.
  • this connection is interrupted (as depicted at I in Fig. 2), according to the invention said terminal 7 is switched towards the host radio node Y.
  • a redundancy switching logic is provided in the subscriber access terminal 7, which is apt to automatically switch upon failure in the connection normally operating between terminal 7 and radio node 2.
  • the invention very simply provides a high redundancy configuration, which is based just on the capability of the subscriber access terminal (AT) (7 in the case of Fig. 2) to be switched from the home radio node (home RN 2 in the case of Fig. 2) to a host radio node (host RN Y), namely to a radio node which is normally allocated to other access terminal (AT) of the same sector, but which exhibits the possibility to bear an additional traffic.
  • AT subscriber access terminal
  • host RN Y host radio node
  • the host radio node may be arranged not only in the same home hub 1 , such as in the case of Fig. 2, but also in a hub different than the one containing the home radio node RN, i.e. in a host hub 8, such as in the case of Fig. 3.
  • a host hub 8 such as in the case of Fig. 3.
  • the host radio node RN belongs to a host hub, it can be necessary to provide the subscriber access terminal AT with two antennas (which are directed towards the two different hubs) and with a two-ways radio frequency switch, or with a single antenna with electronically routed beams. This situation is depicted in Fig. 3.
  • the management system (or local intelligence) MS detects fault on a radio node
  • the MS turns off the transmitter of the faulty RN; 3. the subscriber AT inside the "faulty" sector does not receive downstream traffic and automatically tunes the "host” frequency, the "host” frequency might have been pre-stored during the installation phase;
  • the antenna switch will be routed to the second antenna; 5. the "host” RN manages the new subscriber ATs;
  • MS communicates to the ATs to switch to the original home RN.
  • the invention ensures noticeable benefits, among which, without seek for completeness, it is to mention the cost efficiency in terms of equipment and infrastructures (tower, power, etc.) since no dedicated stand-by unit is needed and an easy upgrade with no impact on the redundancy configuration.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Access terminal re-routing redundancy capability in point-multipoint radio communication systems, consisting of giving a subscriber access terminal the feature to automatically and autonomously switch from a radio node, to which it is normally connected, to an alternative radio node, usually not dedicated to the redundancy functionality. To this purpose, a redundancy switching logic is provided in said access terminal apt to automatically switch to the alternative radio node (host radio node) upon failure in the connection, which normally operates between the terminal itself and the home radio node.

Description

ROUTING REDUNDANCY METHOD IN A POINT TO MULTIPOINT RADIO SYSTEM FOR AN ACCESS TERMINAL
FIELD OF THE INVENTION This invention relates to an access terminal re-routing redundancy capability for point-multipoint systems. BACKGROUND OF THE INVENTION
It is well known that subscribers and/or operators in a radio communication system (typically in a radio communication system of the type shown in Fig. 1 of the annexed drawings) may wish an optional superior reliability, able to avoid any system outage. Such superior reliability is of interest also for operators, not only in order to guarantee the service quality, but also to prevent any loss of revenue during possible black outs.
The number of radio nodes (RNs) needed to a Hub site to cover many sectors depends on many factors, and is directly related to the number of the subscriber terminals in the covered area and on the traffic generated by the same terminals. SUMMARY OF THE INVENTION
The invention faces the problem with a totally different, new and original approach, by proposing a high redundancy configuration, which is based just on the capacity of an access terminal (AT) of a subscriber to be switched from the home radio node (home RN) - when it is inserted in the normal traffic condition - to a host radio node (host RN) - which is in this way allocated, upon failures, to other access terminals (AT) which are in the same sector and having the possibility of bearing an additional traffic.
More precisely, the invention relates to access terminal re-routing redundancy capability in point-multipoint radio communication systems, consisting of giving an access terminal the feature to automatically and autonomously switch from a radio node, to which it is normally connected, to an alternative radio node, usually not dedicated to the redundancy functionality and independently located in the same or in other hubs.
In this system, a logic of switch and redundancy is provided in the access terminal, which is apt to automatically switch to the alternative radio node (host) upon failure in the connection which normally operates between the terminal itself and the home radio node, while the alternative (host) radio node has the capability to be allocated to other access terminals, which are located in the same sector and has the possibility to bear an additional traffic.
Furthermore, when the alternative radio node is located in a radio node different from the one where is the radio node with respect to which it has been switched from the access terminal, the latter is provided with two antennas, which are directed towards said two different hubs, and with a two-ways radio frequency switch or with a single antenna with electronically routed beams. BRIEF DESCRIPTION OF THE DRAWINGS The invention is now described more in depth below, with reference to the annexed drawings, wherein:
Fig. 1 shows, as above mentioned, the scheme of a typical radio communication system to which the present invention applies;
Fig. 2 is a scheme showing a first way to carry out the invention; and Fig. 3 is a scheme showing a second way to carry out the invention.
With reference to Fig. 2, the invention comprises a hub 1 , which accommodates a number of radio nodes (RN) 2, 3, ...Y, each controlled by a control unit 4, 5, ...Z of the node, and a management system (MS) 6. Normally, the subscriber terminal (AT) 7 is connected to the home radio node (home RN) 2, namely it is inserted in a normal traffic condition. When, upon a failure, this connection is interrupted (as depicted at I in Fig. 2), according to the invention said terminal 7 is switched towards the host radio node Y. To this purpose, a redundancy switching logic is provided in the subscriber access terminal 7, which is apt to automatically switch upon failure in the connection normally operating between terminal 7 and radio node 2.
Thereby, the invention very simply provides a high redundancy configuration, which is based just on the capability of the subscriber access terminal (AT) (7 in the case of Fig. 2) to be switched from the home radio node (home RN 2 in the case of Fig. 2) to a host radio node (host RN Y), namely to a radio node which is normally allocated to other access terminal (AT) of the same sector, but which exhibits the possibility to bear an additional traffic.
In the inventive system, the host radio node may be arranged not only in the same home hub 1 , such as in the case of Fig. 2, but also in a hub different than the one containing the home radio node RN, i.e. in a host hub 8, such as in the case of Fig. 3. When the host radio node RN belongs to a host hub, it can be necessary to provide the subscriber access terminal AT with two antennas (which are directed towards the two different hubs) and with a two-ways radio frequency switch, or with a single antenna with electronically routed beams. This situation is depicted in Fig. 3.
As it is understood, with the inventive system it is not so mandatory to provide any stand-by radio node (any expensive RN stand-by), since the redundancy switching logic is, as it has been seen, in the subscriber access terminal (AT) . The procedure which is possible to activate from failure detection to restore of system proper function is below described, only for example purpose:
1 . the management system (or local intelligence) MS detects fault on a radio node;
2. the MS turns off the transmitter of the faulty RN; 3. the subscriber AT inside the "faulty" sector does not receive downstream traffic and automatically tunes the "host" frequency, the "host" frequency might have been pre-stored during the installation phase;
4. if the "host" RN belongs to a different ("host") Hub, then the antenna switch will be routed to the second antenna; 5. the "host" RN manages the new subscriber ATs;
6. the MS re-routes all traffic connections to the host RN,
7. after faulty unit has been restored, MS communicates to the ATs to switch to the original home RN.
The invention ensures noticeable benefits, among which, without seek for completeness, it is to mention the cost efficiency in terms of equipment and infrastructures (tower, power, etc.) since no dedicated stand-by unit is needed and an easy upgrade with no impact on the redundancy configuration.
It is understood that embodiments and/or modifications of the system, other than the ones illustrated, are possible, still remaining in the scope of the present invention.

Claims

1 . Access terminal re-routing redundancy capability in point-multipoint radio communication systems, consisting of giving a subscriber access terminal the feature to automatically and autonomously switch from a radio node, to which it is normally connected, to an alternative radio node, usually not dedicated to the redundancy functionality.
2. Re-routing as claimed in claim 1 ., wherein a redundancy switching logic is provided in said access terminal, apt to automatically switch to the alternative radio node (host radio node) upon failure in the connection, which normally operates between the terminal itself and the home radio node.
3. Re-routing as claimed in any claim 1 . and 2., wherein the host radio node is capable to be allocated to other access terminals located in the same sector and has the possibility to bear an additional traffic.
4. Re-routing as claimed in any claim 1 . to 3., wherein said alternative radio node is located in the same hub as the radio node with respect to which it has been switched.
5. Re-routing as claimed in any claim 1 . to 3., wherein said alternative radio node is located in a hub different than the one where the radio node with respect to which it has been switched is. 6. Re-routing as claimed in claim 5., wherein the access terminal is provided with two antennas directed towards said two different hubs and with a two-ways radio frequency switch, or with a single antenna with electronically routed beams.
AMENDED CLAIMS
[received by the International Bureau on 07 December 2000 (07.12.00); original claim 1 amended; remaining claims unchanged (1 page)]
1 . Access terminal re-routing redundancy capability in point-multipoint radio communication systems for fixed services (FS) and fixed wireless access applications (FWAA), consisting of giving a subscriber access terminal the feature to automatically and autonomously switch from a radio node, to which it is normally connected, to an alternative radio node, usually not dedicated to the redundancy functionality.
2. Re-routing as claimed in claim 1 ., wherein a redundancy switching logic is provided in said access terminal, apt to automatically switch to the alternative radio node (host radio node) upon failure in the connection, which normally operates between the terminal itself and the home radio node.
3. Re-routing as claimed in any claim 1 . and 2. , wherein the host radio node is capable to be allocated to other access terminals located in the same sector and has the possibility to bear an additional traffic.
4. Re-routing as claimed in any claim 1 . to 3., wherein said alternative radio node is located in the same hub as the radio node with respect to which it has been switched.
5. Re-routing as claimed in any claim 1 . to 3., wherein said alternative radio node is located in a hub different than the one where the radio node with respect to which it has been switched is.
6. Re-routing as claimed in claim 5., wherein the access terminal is provided with two antennas directed towards said two different hubs and with a two-ways radio frequency switch, or with a single antenna with electronically routed beams.
EP00944186A 1999-08-19 2000-08-03 Routing redundancy method in a point to multipoint radio system for an access terminal Withdrawn EP1216584A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00944186A EP1216584A1 (en) 1999-08-19 2000-08-03 Routing redundancy method in a point to multipoint radio system for an access terminal

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99830527 1999-08-19
EP99830527A EP1077575A1 (en) 1999-08-19 1999-08-19 Routing redundancy method in a point to multipoint radio system for an access terminal
EP00944186A EP1216584A1 (en) 1999-08-19 2000-08-03 Routing redundancy method in a point to multipoint radio system for an access terminal
PCT/IB2000/001085 WO2001015467A1 (en) 1999-08-19 2000-08-03 Routing redundancy method in a point to multipoint radio system for an access terminal

Publications (1)

Publication Number Publication Date
EP1216584A1 true EP1216584A1 (en) 2002-06-26

Family

ID=8243555

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99830527A Withdrawn EP1077575A1 (en) 1999-08-19 1999-08-19 Routing redundancy method in a point to multipoint radio system for an access terminal
EP00944186A Withdrawn EP1216584A1 (en) 1999-08-19 2000-08-03 Routing redundancy method in a point to multipoint radio system for an access terminal

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP99830527A Withdrawn EP1077575A1 (en) 1999-08-19 1999-08-19 Routing redundancy method in a point to multipoint radio system for an access terminal

Country Status (3)

Country Link
EP (2) EP1077575A1 (en)
AU (1) AU5841700A (en)
WO (1) WO2001015467A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2395629B (en) * 2002-11-20 2006-06-21 Motorola Inc Wireless communications systems and methods

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734190A1 (en) * 1995-03-22 1996-09-25 Siemens Aktiengesellschaft Radio system for connection of subscriber stations to a telecommunications network
US5966668A (en) * 1995-09-01 1999-10-12 Telefonaktiebolaget Lm Ericsson Methods for handling reconfiguration of radio base stations in radio local loop systems
US5903826A (en) * 1996-12-06 1999-05-11 Northern Telecom Limited Extremely high frequency multipoint fixed-access wireless communication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0115467A1 *

Also Published As

Publication number Publication date
EP1077575A1 (en) 2001-02-21
WO2001015467A1 (en) 2001-03-01
AU5841700A (en) 2001-03-19

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