AU723323B2 - Procedure to improve the capacity of a V5 interface in a wireless local loop environment - Google Patents
Procedure to improve the capacity of a V5 interface in a wireless local loop environment Download PDFInfo
- Publication number
- AU723323B2 AU723323B2 AU38519/97A AU3851997A AU723323B2 AU 723323 B2 AU723323 B2 AU 723323B2 AU 38519/97 A AU38519/97 A AU 38519/97A AU 3851997 A AU3851997 A AU 3851997A AU 723323 B2 AU723323 B2 AU 723323B2
- Authority
- AU
- Australia
- Prior art keywords
- terminal device
- procedure
- telephone exchange
- access port
- status data
- 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.)
- Ceased
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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]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Communication Control (AREA)
Description
WO 98/08352 PCT/FI97/00474 1 PROCEDURE TO IMPROVE THE CAPACTY OF A V5 NTERFACE IN A WIRELESS LOCAL LOOP
ENVIRONMENT
The present invention relates to a procedure for maximizing the available capacity of V5 interface in a wireless local loop environment, in which a terminal device is connected via a radio link to a base station and further to an access node and a telephone exchange.
In a wireless local loop (WLL), a terminal device is connected via a radio link to an access node.
Between the terminal device and the access node there is a base station, by means of which the call signals received via radiocommunication from the terminal device are further transmitted through.the access node to the public telephone network and vice versa. The access node is connected to the telephone exchange using the V5.1 or V5.2 protocol.
Open interfaces (V5.1 and V5.2) between an access node and a telephone exchange are defined in the ETSI (European Telecommunications and Standards Institute) standards of the ETS 300 324 and ETS 300 347 series.
interfaces enable subscribers belonging to a physically separate local loop, which may be a wired or a wireless network, to be connected using the standard interface of a telephone exchange. A dynamic concentrator interface V5.2 consistent with the standards ETS 300 347-1 and 347-2 consists of one or more (1 16) PCM (Pulse Code Modulation) cables. One PCM cable comprises a total of 32 channels, each of which with a transfer rate of 64 kbit/s, i.e. 2048 kbit/s in all. The V5.2 interface supports analogue telephones as used in the public telephone network, digital subscriptions, such as ISDN (Integrated Services Digital Network) basic and system subscriptions as well as other analogue or digital terminal equipment based on semi-fixed connections.
In a prior-art system, there is no way for the telephone exchange to determine whether the terminal device is accessible or not. To set up a call addressed to a terminal device, the call control system of the telephone exchange reserves a time slot in the V5 interface and informs the access node about the call. The access node reserves resources for the call until the radio network control system announces that the terminal device is inaccessible. Based on this notice, the access node releases the resources it has reserved and informs the telephone exchange about the unsuccessful call setup, whereupon the telephone exchange releases the reserved V5 interface time slot, making it available for other users.
l0 The problem with the procedure described above is that when call signals are transmitted from the telephone exchange via a concentrated access node to a closed terminal device, this involves unnecessary reservation of local loop capacity. Especially in the V5 interface between the telephone exchange and the access node, such call setup occupies a time slot or time slots to no purpose, because it is only in the access node that information about the inaccessibility of the terminal device is obtained.
S* ••The object of the present invention is to eliminate the problem described above.
i A specific object of the present invention is to produce a procedure that allows more effective utilization of the available capacity of a V5 interface.
S" Accordingly, the invention provides a procedure for maximizing the available S 20 capacity of a V5 interface in a wireless local loop environment comprising an access node, which is connected to a telephone exchange via the V5 interface, and a base station serving to transmit call signals between the access node and the terminal device, in which procedure at least one time slot in the V5 interface is reserved for calls from the telephone o ,°exchange to the terminal device, the procedure comprising the steps of: monitoring the accessibility of the tenninal device in the telephone exchange; o and ~inhibiting a call to an inaccessible terminal device in the telephone exchange.
In the procedure of the invention, to maximize the available capacity of a interface in a wireless local loop environment, at least one of the time slots of the interface is reserved for calls from the telephone exchange to the terminal device.
Available capacity refers to the maximum capacity of the V5 interface, which means a certain number of time slots. The local loop environment comprises an access node connected to a IR:\LIBQ]00252.doc:GMM WO 98/08352 PCT/FI97/00474 3 telephone exchange via a V5 interface, and a base station communicating with the access node and used to transmit call signals between the access node and the terminal device.
In the procedure of the invention, the accessibility of the terminal device is monitored in the telephone exchange and the setup of a call addressed to an inaccessible terminal device is disabled in the telephone exchange. This makes it possible to avoid useless reservation of time slots in a situation where the terminal device proves to be off and unable to receive calls.
A terminal device is accessible when calls can be transmitted to it. The monitoring is based on sending to the telephone exchange access port status data, which is maintained in the access node and indicates the accessibility of the terminal device connected to the access port. The access port status data is preferably updated in the telephone exchange at the same time when the access port status data is updated in the access node. The maintenance and updating of the access port status data is implemented in accordance with the V5 recommendations by means of the control protocol. The access port status may be either OPERATIONAL or BLOCKED, i.e. accessible or inaccessible. Further, the access port status data is preferably updated to BLOCKED when the radio link between the base station and the terminal device is broken, i.e. when the terminal device is outside the coverage area of the base station or when the radio link is broken for other reasons. Thus, the call control system can immediately release the time slot which possibly had been reserved for the terminal device, i.e. if the terminal device was engaged in an active call when the radio link was broken.
In a preferred embodiment, the information relating to the accessibility of the terminal device is transmitted via IMSI attach and IMSI detach (IMSI, International Mobile Subscriber Identity) functions car- WO 98/08352 PCT/FI97/00474 4 ried out by the terminal device, which functions are described e.g. in the standards of the ETS 300 530 series. When power is switched on in the terminal device, it starts the IMSI attach function, which in practice corresponds to a standard terminal device location update procedure. Data indicating that the terminal device is operational is generally stored in binary form in the access node. The IMSI detach function is performed when power is switched off from the terminal device. In this case, too, corresponding status data is stored in the access node. In the access node, the status of the terminal device is indicated by the access port status data.
As compared with prior art, the present invention has the advantage that it makes it possible to reduce the load on the call control resources both in the local exchange and in the access node. Furthermore, the invention makes it possible to avoid unnecessary reservations of V5 interface time slots, thus making more time slots available for other calls to be transmitted.
A
further advantage of the invention is that the terminal device status data can be better monitored using the IMSI attach and detach functions.
In the following, the invention is described in detail by the aid of an embodiment by referring to the attached drawing, which represents a wireless local loop environment according to the present invention.
The wireless local loop system presented in the drawing comprises an access node 2. The access node 2 functions as a concentrating element between a telephone exchange 3 and a terminal device 5, connecting the subscriber to the telephone exchange 3. The access node 2 is connected via a V5.2 interface 1, which comprises 1 16 PCM cables (2 Mbit/s), to the exchange terminal (ET) (not shown) of the telephone exchange 3, the terminal exchange being provided with the functions required by the V5 interface. Moreover, the system illustrated by WO 98/08352 PCT/FI97/00474 the drawing comprises a number of base stations 4a, 4b and 4c, each one of which has a given coverage area. In the system presented in the drawing, to set up a connection between a terminal device and the telephone exchange, signals are transmitted via radiocommunication between the base station 4a and the terminal device 5 and further viawired connections from the base station to the access node 2 and via the V5 interface 1 from the access node to the telephone exchange.
Further referring to the drawing, when the terminal device 5 is switched on, an IMSI attach function consistent with the above-mentioned recommendations is executed. Via this action, the terminal device 5 informs the network that it is operational, so calls addressed to the terminal device can be transmitted to it. In the access node 2, the status data for the access port corresponding to the terminal device 5 is updated to the value OPERATIONAL. At the same time, the access port status data is also updated in the telephone exchange 3 by means of the control protocol of the V5 interface 1 by updating the subscriber data stored in the telephone exchange for the V5 interface used by the access port.
When power is switched off from an operational terminal device 5, the terminal device carries out an IMSI detach function, for which the terminal device does not expect a confirmation from the base station. Via this action, the terminal device announces that it is not operational, in other words, that the terminal device is inaccessible, which means that no calls can be transmitted to the terminal device. The status data for the access port corresponding to the terminal device is now updated to the value BLOCKED. At the same time, the access port status data is also updated in the telephone exchange 3 by means of the control protocol of the interface by updating the subscriber data for the V5 interface used by the access port, stored in the telephone exchange.
WO 98/08352 PCT/FI97/00474 6 Further, when a call is to be set up, a check can be carried out first in the telephone exchange to determine whether the called terminal device is operational or not, by reading the access port status data for the terminal device in question. In this way, abortive reservations of time slots in the V5 interface 1 between the access node 2 and the telephone exchange are avoided.
The invention is not restricted to the embodiment example presented above, but many variations are possible within the framework of the inventive idea defined by the claims.
Claims (7)
1. A procedure for maximising the available capacity of a V5 interface in a wireless local loop environment comprising an access node, which is connected to a telephone exchange via the V5 interface, and a base station serving to transmit call signals between the access node and the terminal device, in which procedure at least one time slot in the interface is reserved for calls from the telephone exchange to the terminal device, the procedure comprising the steps of: monitoring the accessibility of the terminal device in the telephone exchange; and inhibiting a call to an inaccessible terminal device in the telephone exchange.
2. The procedure as defined in claim 1, whereby access port status data indicating the accessibility of the terminal device connected to an access port is transmitted to the telephone exchange.
3. The procedure as defined in claim 2, whereby the access port status data is S: 20 transmitted to the telephone exchange when the access port status data is updated in the access node. S4. The procedure as defined in any one of claims 1 3, whereby access port status data is transmitted to the telephone exchangeby updating subscriber data for the 25 interface, which are stored in the telephone exchange.
5. The procedure as defined in any one of claims 1 4, comprising the further steps of: carrying out an International Mobile Subscriber Identity (IMSI) attach function by the terminal device when the terminal device is switched on; updating access port status data for the terminal device to OPERATIONAL, indicating that the terminal device is accessible based on the IM4SI attach function; and transmitting the access port status data to the telephone exchange. 41 The procedure as defined in any one of claims 1 4, comprising the further steps [R:LIBQ]00252.doc:GMM 8 carrying out an IMSI detach function by the terminal device when the terminal device is switched off; updating access port status data for the terminal device to BLOCKED, indicating that the terminal device is inaccessible based on the IMSI detach function; and transmitting the access port status data to the telephone exchange.
7. The procedure as defined in any one of claims 1 6, whereby access port status data is updated to BLOCKED when the radio link between the base station and the terminal device is broken.
8. The procedure as defined in any one of claims 1 7, whereby access port status data is transmitted to the telephone exchange via the CONTROL protocol.
9. The procedure as defined in any one of claims 1 8, whereby the status of the terminal device is monitored in the telephone exchange on the basis of subscriber data of the V5 interface. 20 10. A procedure for maximising the available capacity of a V5 interface substantially as hereinbefore described with reference to Figure 1. :DATED this Second Day of May, 2000 Nokia Telecommunications OY S 25 Patent Attorneys for the Applicant SPRUSON FERGUSON too* [R:\LIBQ]00252.doc:GMM
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI963302A FI103370B (en) | 1996-08-23 | 1996-08-23 | Procedure for maximizing the V5 interface's accessible capacity in wireless subscriber network environment |
| FI963302 | 1996-08-23 | ||
| PCT/FI1997/000474 WO1998008352A1 (en) | 1996-08-23 | 1997-08-12 | Procedure to improve the capacity of a v5 interface in a wireless local loop environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3851997A AU3851997A (en) | 1998-03-06 |
| AU723323B2 true AU723323B2 (en) | 2000-08-24 |
Family
ID=8546521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU38519/97A Ceased AU723323B2 (en) | 1996-08-23 | 1997-08-12 | Procedure to improve the capacity of a V5 interface in a wireless local loop environment |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1016297A1 (en) |
| JP (1) | JP2001505722A (en) |
| CN (1) | CN1228232A (en) |
| AU (1) | AU723323B2 (en) |
| BR (1) | BR9711636A (en) |
| CA (1) | CA2263580A1 (en) |
| FI (1) | FI103370B (en) |
| WO (1) | WO1998008352A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI106688B (en) * | 1997-12-17 | 2001-03-15 | Nokia Networks Oy | A method for implementing state monitoring of an ISDN user port |
| FI981767A (en) * | 1998-08-17 | 2000-02-18 | Nokia Networks Oy | A method and system for maximizing the capacity of a communication system |
| KR100312310B1 (en) * | 1999-03-12 | 2001-11-03 | 윤종용 | Method for managing a plurality of radio links in wireless local loop |
| KR20010061854A (en) * | 1999-12-29 | 2001-07-07 | 박원배 | Apparatus for connecting remote subscriber switch using v5.2 interface module |
| CN1223213C (en) * | 2002-03-13 | 2005-10-12 | 华为技术有限公司 | Monitoring method of A interface circuit in wireless communication system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0452290A1 (en) * | 1990-04-10 | 1991-10-16 | Telefonaktiebolaget L M Ericsson | A mobile telephone system intended for indoor and outdoor subscriber use |
| US5212831A (en) * | 1990-11-28 | 1993-05-18 | Bell Communications Research, Inc. | Method and apparatus for autonomous adaptive frequency assignment in TDMA portable radio systems |
| WO1996021998A2 (en) * | 1995-01-04 | 1996-07-18 | Nokia Telecommunications Oy | Radio system for cordless subscriber line interface |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8917740D0 (en) * | 1989-08-03 | 1989-09-20 | Orbitel Mobile Communications | Channel assignment and power control arrangement in a radio communication system |
-
1996
- 1996-08-23 FI FI963302A patent/FI103370B/en active IP Right Grant
-
1997
- 1997-08-12 WO PCT/FI1997/000474 patent/WO1998008352A1/en not_active Application Discontinuation
- 1997-08-12 AU AU38519/97A patent/AU723323B2/en not_active Ceased
- 1997-08-12 CN CN 97197292 patent/CN1228232A/en active Pending
- 1997-08-12 JP JP51044998A patent/JP2001505722A/en active Pending
- 1997-08-12 BR BR9711636A patent/BR9711636A/en unknown
- 1997-08-12 EP EP97935585A patent/EP1016297A1/en not_active Withdrawn
- 1997-08-12 CA CA002263580A patent/CA2263580A1/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0452290A1 (en) * | 1990-04-10 | 1991-10-16 | Telefonaktiebolaget L M Ericsson | A mobile telephone system intended for indoor and outdoor subscriber use |
| US5212831A (en) * | 1990-11-28 | 1993-05-18 | Bell Communications Research, Inc. | Method and apparatus for autonomous adaptive frequency assignment in TDMA portable radio systems |
| WO1996021998A2 (en) * | 1995-01-04 | 1996-07-18 | Nokia Telecommunications Oy | Radio system for cordless subscriber line interface |
Also Published As
| Publication number | Publication date |
|---|---|
| FI963302A0 (en) | 1996-08-23 |
| FI963302A (en) | 1998-02-24 |
| FI103370B1 (en) | 1999-06-15 |
| JP2001505722A (en) | 2001-04-24 |
| EP1016297A1 (en) | 2000-07-05 |
| BR9711636A (en) | 1999-08-24 |
| CA2263580A1 (en) | 1998-02-26 |
| FI103370B (en) | 1999-06-15 |
| WO1998008352A1 (en) | 1998-02-26 |
| AU3851997A (en) | 1998-03-06 |
| CN1228232A (en) | 1999-09-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |