AU722240B2 - Procedure and system for ensuring emergency calls in a wireless local loop - Google Patents
Procedure and system for ensuring emergency calls in a wireless local loop Download PDFInfo
- Publication number
- AU722240B2 AU722240B2 AU53253/98A AU5325398A AU722240B2 AU 722240 B2 AU722240 B2 AU 722240B2 AU 53253/98 A AU53253/98 A AU 53253/98A AU 5325398 A AU5325398 A AU 5325398A AU 722240 B2 AU722240 B2 AU 722240B2
- Authority
- AU
- Australia
- Prior art keywords
- call
- emergency
- start message
- priority
- call start
- 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.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/50—Connection management for emergency connections
-
- 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]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Business, Economics & Management (AREA)
- Health & Medical Sciences (AREA)
- Emergency Management (AREA)
- Environmental & Geological Engineering (AREA)
- Public Health (AREA)
- Mobile Radio Communication Systems (AREA)
- Telephonic Communication Services (AREA)
- Small-Scale Networks (AREA)
- Alarm Systems (AREA)
Description
WO 98/31180 l "/FI98/00010 1 PROCEDURE AND SYSTEM FOR ENSURING EMERGENCY CALLS IN A WIRELESS LOCAL LOOP The present invention relates to a procedure for ensuring emergency calls in a wireless local loop, as defined in the preamble of claim 1.
In a wireless local loop (WLL), a terminal device is connected via a wireless link to an access node (AN) or a WLL controller. The access node may consist of multiplexers, crossbar switches and various transmitting systems. The WLL system may be based e.g. on technology used in mobile telephone systems, such as the GSM/DCS1800 technology (GSM, Global System for Mobile Communications; DCS, Digital Cellular System). GSM is a European digital mobile communication system standardized by ETSI. DCS-1800 is a mobile communication system standardized by ETSI, which is based on the GSM specification and aims at a more effective use of microcells and which works in the frequency range of 1800 MHz. Between the terminal device and the access node there is a base station, through which call signals sent by the terminal device over a radio channel are transmitted via the access node to a public telephone network and vice versa. The access node or WLL controller can be connected to the telephone exchange using e.g. the V5.2 protocol consistent with the ETS 300 347-2 standard.
In this context, ensuring an emergency call means that, in the event of overload on a base station in a wireless local loop, the setup of a call initiated by a subscriber's station is ensured while at the same time preventing the setdown of other ongoing emergency calls from other subscriber's stations under the same base station when resources have to be released for the setup of an emergency call by disconnecting other calls.
In a system consistent with mobile communication specifications, such as a GSM system, if an insufficiency of resources appears, a call started with an WO 98/31180 PCTNM/00n010 2 emergency call start message may initiate forced release of a call of a lower priority.
When an access node is transmitting calls in normal load conditions, the system controlling the radio resources of the base station does not know which one of the ongoing calls is a normal call and which one is an emergency call. This is because only emergency calls made from a so-called non-transparent WLL subscriber's station to a common emergency number, e.g. 112, begin with an emergency call start message an EMERGENCY_SETUP message consistent with the GSM specifications). Calls made to other emergency numbers specified in the subscriber identification unit, such as the SIM card provided in the subscriber 's station, begin with a normal call start message, e.g. a SETUP message consistent with the GSM specifications, if free communication channels are available. In the case of a socalled transparent WLL subscriber's station, even calls made to an emergency number are set up via the normal call setup procedure and begin with a normal call start message because a communication link to the exchange has already been set up when the number is being dialled.
Thus, the problem is that when the base station is overloaded and a subscriber's station in a wireless local loop under it starts an emergency call (which begins with an emergency call start message, such as EMERGENCY SETUP), forced release of resources for the emergency call in accordance with the GSM specifications is impossible because the other call to be disconnected to make room for the emergency call may also be an emergency call although it has been started with a normal call start message (SETUP). Hand-over of the ongoing call to another base station is also impossible because subscriber mobility is not allowed in the WLL access node.
In the original GSM system, this problem does not appear because an emergency call to a common emer- -3gency number always begins with an emergency call start message (EMERGENCY_SETUP message). In cases where the cell concerned has been loaded, there have been two possible ways to cope with the situation: forced handover to another cell or forced disconnection (pre-emption) of an ongoing call, which is possible because the resource management system of the wireless network is always aware of ongoing emergency calls.
Forced disconnection and/or handover is allowed: when a call (in this case an emergency call) waiting for a communication channel has the right to cause disconnection of an ongoing call, when there is a call for which vulnerability indicator has been set (vulnerability allowed), and when a call waiting for a wireless communication channel has priority level 1.
The object of the invention is to present a procedure that makes it possible to ensure the setup of an emergency call in an overload situation in a wireless local loop while at the same time preventing forced disconnection of other ongoing emergency calls.
A further object of the invention is to present a procedure that allows even an 0° emergency call initiated with a normal call start message to be identified or distinguished from normal calls, so that the wireless network management of the system will know which call is an emergency call and which call is a normal call that can be disconnected to release resources.
Accordingly, the invention provides a method for ensuring emergency calls in a wireless local loop, in which subscribers' stations are connected over a radio link via a 9 ooo• base station to an access node and from the access node to a local exchange of a wired telephone network, in which procedure the authentication process carried out in conjunction with call setup comprises establishing whether the call is to be initiated with Si° .a normal call start message or with an emergency call start message that is allowed to cause forced disconnection of another ongoing call having a lower priority, the method comprising the steps of: a) assigning top priority to a call initiated with a normal call start message and making a definition to the effect that forced disconnection of the call is not allowed and that the call is not allowed to cause the disconnection of another call; and b) comparing the dialled number information of the call with a set of predetermined emergency numbers, and lowering the priority level of the call and allowing forced disconnection of the call, if the call is addressed to a number not included in the set of predetermined emergency numbers.
[R:\IABQ]265 doc mixl -4- Thanks to the invention, the system is always able to decide which one of the ongoing calls is an emergency call and which one is a normal call that can be released in an overload situation.
In an embodiment of the procedure, the priority level reduced at stage b) is updated in the interface defining the signalling between the radio line of a wireless local loop and a wired telephone network, in particular in a so-called Abis interface, and information regarding the new lowered priority is given to the resource management system of the wireless network, thus letting it know which ones of the calls initiated with a normal call start message are subject to forced disconnection when an emergency call is received in an overload situation.
In an embodiment of the procedure, the call start messages are messages consistent with a mobile communication specification.
In an embodiment of the procedure, the call start messages are messages consistent with the GSM specification.
15 In an embodiment of the procedure, the normal call start message is a SETUP call start message.
.i In an embodiment of the procedure, the call start message for an emergency call is an EMERGENCY SETUP call start message.
In an embodiment of the procedure, the highest priority assigned at stage a) is priority level 1 according to the GSM specification.
9 [R:\LIBQ]265.doc:mxl WO 9831180 PCT/F"SI00010 In an embodiment of the procedure, the lowered priority assigned at stage b) is a priority level other than 1 according to the GSM specification.
In an embodiment of the procedure, the comparison at stage b) is carried out in the access node.
In an embodiment of the procedure, the predetermined emergency number is an emergency number stored in a subscriber identification unit, such as a SIM card, in the subscriber's station. The emergency number predefined in a subscriber identification unit, such as a SIM card, is naturally also defined in the parameters of the access node concerned to allow comparison.
In the following, the invention is described by the aid of a few examples of its embodiments by referring to the attached drawing, which presents a diagram of a system in which the procedure of the invention can be applied.
The figure shows a diagram representing a wireless local loop system WLL. in a wireless local loop, in which subscriber's stations MS are connected over a radio link via a base station BS to an access node AN and from the access node to a local exchange LE in a wired network.
In conjunction with the authentication procedure, all calls initiated from the WLL access node with a normal SETUP message are given the following parameters: top priority 1 call is not subject to forced disconnection (vulnerability disabled) call is not allowed to cause forced disconnection of another call.
Correspondingly, calls initiated with an emergency call start message EMERGENCY_SETUP are assigned the following parameters: top priority 1 call is not subject to forced disconnection (vulnerability disabled) WO 98/31180 PC/F198/00010 call is allowed to cause forced disconnection of another ongoing call having a lower priority.
The access node AN makes the appropriate connections to the local exchange LE as required for a call started with a SETUP message. When the number dialled by the subscriber is available to the access node AN for interpretation, it is compared with the predefined emergency numbers. If the call is addressed to the common emergency number 112 or some other emergency number specified in the SIM, the priority of the call will not be changed during the call, in other words, its priority level 1 is preserved.
If a call started with a SETUP message is addressed to a number other than the common emergency number 112 or some other emergency number specified in the SIM, then the process comparing the dialling will send data indicating a lowered priority of the call along the signalling chain towards the wireless network. The parameters of the call are set so that the priority of the call is lowered (to a value other than 1) vulnerability of the call is allowed.
When the message regarding the lowered priority level reaches the signalling process of the Abis interface, which defines the signalling between the transmission path of the wireless local loop and the wired telephone network, said signalling process updates the lowered priority for itself and also informs the wireless network resource management of the cell in question about the new priority level.
Subsequently, when a call initiated with an emergency call start message, i.e. an EMERGENCY_SETUP call start message, is received in a possible overload situation, forced call disconnection can be initiated by the resource management system of the wireless network.
The wireless network resource management knows which calls can be disconnected in an emergency. The procedure WO 98/31180 PCT/FI98/00010 7 enables the wireless network resource management to decide which calls can be released in an overload situation to allow the connection of a possible emergency call.
The invention is not restricted to the embodiment example described above, but instead many variations are possible within the framework of the inventive idea defined by the claims.
Claims (11)
1. A method for ensuring emergency calls in a wireless local loop, in which subscriber's stations are connected over a radio link via a base station to an access node and from the access node to a local exchange of a wired telephone network, in which procedure the authentication process carried out in conjunction with call setup comprises establishing whether the call is to be initiated with a normal call start message or with an emergency call start message that is allowed to cause forced disconnection of another ongoing call having a lower priority, the method comprising the steps of: a) assigning top priority to a call initiated with a normal call start message and making a definition to the effect that forced disconnection of the call is not allowed and that the call is not allowed to cause the disconnection of another call; and b) comparing the dialled number information of the call with a set of predetermined emergency numbers, and lowering the priority level of the call and allowing forced disconnection of the call, if the call is addressed to a number not included in the set of predetermined emergency numbers.
2. A method as claimed in claim 1, whereby the priority level lowered at step b) is updated in the interface defining the signalling between the radio transmission 20 path of the wireless local loop and the wired telephone network, in particular in a so- called Abis interface, and information regarding the new lowered priority is sent to the oO resource management system of the wireless network, thus letting the wireless network S..1 resource management know which calls initiated with a normal call start message are subject to forced disconnection when an emergency call is received in an overload situation. o°•a.
3. A method as claimed in either one of claim 1 or 2, whereby the call start *.at messages are messages consistent with a mobile communication specification. a. 30
4. A method as claimed in any one of claims 1 to 3, whereby the call start messages are messages consistent with the GSM specification.
A method as claimed in claim 4, whereby the normal call start message Sis a SETUP call start message. [R:\LIBK]1607.doc:BFD -9-
6. A method as claimed in either one of claim 4 or 5, whereby the call start message for an emergency call is an EMERGENCY_SETUP call start message.
7. A method as claimed in any one of claims 1 to 6, whereby the highest priority assigned at step a) is priority level 1 according to the GSM specification.
8. A method as claimed in any one of claims 1 to 7, whereby the lowered priority assigned at step b) is a priority level other than 1 according to the GSM specification.
9. A method as claimed in any one of claims 1 to 8, whereby the comparison at step b) is carried out in the access node.
A method as claimed in any one of claims 1 to 9, whereby the predetermined emergency number is an emergency number stored in a subscriber identification unit, such as a SIM card, in the subscriber's station.
11. A method for ensuring emergency calls in a wireless local loop, substantially as described herein with reference to any one of the embodiments, as that I 20 embodiment is described in the accompanying drawings. DATED this Thirtieth Day of August, 1999 Nokia Telecommunications OY S: Patent Attorneys for the Applicant SPRUSON FERGUSON S 0** 9** 9* .b 0 [R:\LIBK]I 607.doc:BFD
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI970118 | 1997-01-10 | ||
| FI970118A FI103557B (en) | 1997-01-10 | 1997-01-10 | Procedure for securing an emergency call in a wireless subscriber network |
| PCT/FI1998/000010 WO1998031180A1 (en) | 1997-01-10 | 1998-01-02 | Procedure and system for ensuring emergency calls in a wireless local loop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU5325398A AU5325398A (en) | 1998-08-03 |
| AU722240B2 true AU722240B2 (en) | 2000-07-27 |
Family
ID=8547543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU53253/98A Ceased AU722240B2 (en) | 1997-01-10 | 1998-01-02 | Procedure and system for ensuring emergency calls in a wireless local loop |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1013123A1 (en) |
| JP (1) | JP2001508255A (en) |
| CN (1) | CN1243648A (en) |
| AR (1) | AR012029A1 (en) |
| AU (1) | AU722240B2 (en) |
| BR (1) | BR9807059A (en) |
| CA (1) | CA2277066A1 (en) |
| FI (1) | FI103557B (en) |
| WO (1) | WO1998031180A1 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1104978A1 (en) * | 1999-11-30 | 2001-06-06 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Method and device for selecting services |
| DE10037740C1 (en) | 2000-08-02 | 2002-04-25 | Siemens Ag | Procedure for the transmission of emergency calls in a radio communication system |
| KR100451725B1 (en) | 2001-06-14 | 2004-10-08 | 엘지전자 주식회사 | Method for service providing in Wireless Local Loop System |
| CN100366122C (en) * | 2003-05-28 | 2008-01-30 | 华为技术有限公司 | Preferential inserting method for preferential insert and channel assigned user |
| US7050785B2 (en) | 2003-12-08 | 2006-05-23 | Research In Motion Limited | Apparatus and method of explicit indication of call from emergency call centre |
| US8682279B2 (en) | 2004-05-07 | 2014-03-25 | Interdigital Technology Corporation | Supporting emergency calls on a wireless local area network |
| KR101122359B1 (en) | 2004-05-07 | 2012-03-23 | 인터디지탈 테크날러지 코포레이션 | Supporting emergency calls on a wireless local area network |
| US8145182B2 (en) | 2004-05-07 | 2012-03-27 | Interdigital Technology Corporation | Supporting emergency calls on a wireless local area network |
| US7499411B2 (en) * | 2005-05-26 | 2009-03-03 | Symbol Technologies, Inc. | System and method for providing automatic load balancing and redundancy in access port adoption |
| JP4438703B2 (en) * | 2005-06-27 | 2010-03-24 | 株式会社デンソー | In-vehicle wireless communication device |
| CN100426924C (en) * | 2005-09-04 | 2008-10-15 | 华为技术有限公司 | Radio local loop system, device and method for processing urgent call |
| US8126468B2 (en) * | 2006-03-24 | 2012-02-28 | Kyocera Corporation | Apparatus, system and method for priority call management |
| JP4893182B2 (en) * | 2006-09-20 | 2012-03-07 | 沖電気工業株式会社 | IP phone system using wireless LAN |
| US7933581B2 (en) | 2007-06-08 | 2011-04-26 | Research In Motion Limited | Methods and apparatus for use in processing disconnected emergency calls and other communications involving mobile communication devices and the remote monitoring thereof |
| DE102007060377A1 (en) * | 2007-12-12 | 2009-07-02 | T-Mobile Internationale Ag | Method for establishing prioritized incoming calls in overload situations in a mobile radio network |
| CN101500041A (en) * | 2008-01-30 | 2009-08-05 | 中兴通讯股份有限公司 | Call control method and apparatus |
| JP2009153141A (en) * | 2008-12-24 | 2009-07-09 | Kyocera Corp | Wireless subscriber system, line connection controller for wireless subscriber system and recording medium |
| DE202009019094U1 (en) * | 2009-12-11 | 2016-05-30 | Telegärtner Elektronik GmbH | SIM card and emergency call module |
| CN111092998A (en) * | 2020-02-21 | 2020-05-01 | 深圳震有科技股份有限公司 | Telephone emergency calling method, system and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0304955A2 (en) * | 1987-08-27 | 1989-03-01 | Nec Corporation | Radio concentrator system capable of completing calls under congested traffic |
| WO1997016931A1 (en) * | 1995-11-01 | 1997-05-09 | Motorola Inc. | Method and apparatus for allocating a communication channel in a communication system |
-
1997
- 1997-01-10 FI FI970118A patent/FI103557B/en active
-
1998
- 1998-01-02 WO PCT/FI1998/000010 patent/WO1998031180A1/en not_active Application Discontinuation
- 1998-01-02 BR BR9807059-2A patent/BR9807059A/en not_active IP Right Cessation
- 1998-01-02 AU AU53253/98A patent/AU722240B2/en not_active Ceased
- 1998-01-02 EP EP98900089A patent/EP1013123A1/en not_active Withdrawn
- 1998-01-02 CN CN98801727A patent/CN1243648A/en active Pending
- 1998-01-02 CA CA002277066A patent/CA2277066A1/en not_active Abandoned
- 1998-01-02 JP JP53057898A patent/JP2001508255A/en active Pending
- 1998-01-07 AR ARP980100079A patent/AR012029A1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0304955A2 (en) * | 1987-08-27 | 1989-03-01 | Nec Corporation | Radio concentrator system capable of completing calls under congested traffic |
| WO1997016931A1 (en) * | 1995-11-01 | 1997-05-09 | Motorola Inc. | Method and apparatus for allocating a communication channel in a communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1243648A (en) | 2000-02-02 |
| FI103557B1 (en) | 1999-07-15 |
| FI970118A0 (en) | 1997-01-10 |
| FI103557B (en) | 1999-07-15 |
| EP1013123A1 (en) | 2000-06-28 |
| CA2277066A1 (en) | 1998-07-16 |
| WO1998031180A1 (en) | 1998-07-16 |
| FI970118A (en) | 1998-07-11 |
| JP2001508255A (en) | 2001-06-19 |
| BR9807059A (en) | 2000-05-02 |
| AR012029A1 (en) | 2000-09-27 |
| AU5325398A (en) | 1998-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |