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GB2452691A - Signaling management in cellular mobile radio communications network - Google Patents

Signaling management in cellular mobile radio communications network Download PDF

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Publication number
GB2452691A
GB2452691A GB0709968A GB0709968A GB2452691A GB 2452691 A GB2452691 A GB 2452691A GB 0709968 A GB0709968 A GB 0709968A GB 0709968 A GB0709968 A GB 0709968A GB 2452691 A GB2452691 A GB 2452691A
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GB
United Kingdom
Prior art keywords
signalling
cell
temporary
area
mobile radio
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Withdrawn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
GB0709968A
Other versions
GB0709968D0 (en
Inventor
Julie Teasdale
Iskren Ianev
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to GB0709968A priority Critical patent/GB2452691A/en
Publication of GB0709968D0 publication Critical patent/GB0709968D0/en
Priority to PCT/JP2008/059859 priority patent/WO2008146868A1/en
Publication of GB2452691A publication Critical patent/GB2452691A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/04—User notification, e.g. alerting and paging, for incoming communication, change of service or the like multi-step notification using statistical or historical mobility data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/02—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration by periodical registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method of managing multi-cell signalling areas within a cellular mobile radio communications network, and which comprises the steps of determining if a mobile radio communications device is stationary within a first said signaling area, and assigning the said mobile radio communications device to a temporary signaling area responsive to a determination that the mobile radio communications device is stationary, and wherein the number of cells in the said temporary signaling area is less than the number within the said first multi-cell signaling area, and in one particular embodiment the temporary signaling area comprises a single-cell Tracking Area.

Description

SIGNALLING MANAGEMENT IN CELLULAR
MOBILE RADIO COMMUNICATIONS NETWORK
The present invention relates to a method for managing multi-cell signalling areas within a cellular mobile radio communications network.
In addition to the actual communications signals received at, and transmitted from, a mobile radio communications device such as a cell phone handset, additional network signalling also arises in relation to call-management and, for example, in relation to paging procedures. To assist with the handling of such signalling, the cells of a network can be divided between different signalling areas.
Examples of known multi-cell signalling areas comprise Tracking Areas (TA) defined for use in relation to Long Term Evolution (LTE) networks, and Routing Areas (RA) and Location Areas (LA) employed in relation to 3G and 2G technology respectively.
As a particular illustrative example relating to LTE network systems, paging procedures for contacting a cellular phone handset, for the purpose for example, of handling incoming calls at the handset, employ multi-cell TAs determined by the network and which can be defined in broadcasts to the cell phone handset within System Information (SI) data that is arranged to be received by the cell phone handsets found within a particular cell forming part of that TA.
The signalling received by the cell phone handset can serve to confirm to the handset which TA it is located in and the handset is then paged via the cNodeB of every cell within that TA.
The management of signalling areas such as known TAs arising in relation to LTE systems exhibit particular characteristics and, in some cases disadvantages and limitations.
In particular, disadvantageous ping-pong signalling effects can arise due to the frequency TA updates required for cell changes that arise on TA boundaries and an increase in TA updates can arise if a relatively large population of cell phone handsets requires near simultaneous registration, for example when a large number of network-subscribers are travelling on a train through and between TAs.
Also it is now identified that the comparative requirements of fast-moving, as compared with slow-moving, or stationary, cell phone handsets serve to focus, and in some cases emphasise, particular inefficiencies within TAs and, in some cases, an inappropriate choice of TA.
The present invention seeks to provide for a method of signalling area management having advantages over known such methods.
In particular, the invention seeks to provide for improved signalling area management in relation to cellular phone handsets that are found to be stationary.
As used herein, the term stationary is taken to imply that the handset's location within a particular cell, or indeed within a particular signalling area, is considered to be constant for a particular period. Thus, the term stationary also implies that the cellular phone handset might be relatively slow-moving within a particular cell or particular signalling area.
According to a first aspect of the present invention there is provided a method of managing multi-cell signalling areas within a cellular mobile radio communications network, the method comprising the steps of determining if a mobile radio communications device is stationary within a first said signalling area, and assigning the said mobile radio communications device to a temporary signalling area responsive to a determination that the mobile radio communications device is stationary, and wherein the number of cells in the said temporary signalling area is less than the number within the said first multi-cell signalling area.
The invention is particularly advantageous insofar as, with the aforementioned temporary signalling area, and responsive to the lack of movement of the cellular phone handset, it proves possible to limit the signalling that would otherwise arise within the signalling area so as, for example, to reduce the paging overhead arising within the system and also increase the over-the-air efficiency thereof Preferably, the method also includes the step of determining whether or not it is appropriate to establish the said temporary signalling area and/or, cancel the temporary signalling area.
The establishment or cancellation of the temporary signalling area can be made responsive to information provided from the cellular phone handset to the network.
Also, the aforementioned establishment/cancellation can be made responsive to factors such as network load and/or the number of stationary cell phone handsets within for example, a particular cell.
Advantageously, the method includes the provision of a stationary indicator within signalling delivered from the cell phone handset to the network.
In particular, such a stationary indicator can be provided as part of the periodic update procedure.
Further details of the stationary indicator can be found in the applicants co-pending UK Patent Application 0707455.2. To summarise, with regard to the criteria that can be employed to determine whether or not the mobile radio communications device is stationary, if no reselection procedures has occurred for a duration of the periodic TA update timer the mobile radio communications device can set a Stationary in Cell (SiC) flag ON. As soon as the mobile radio communications device re-selects, it can set the SiC flag OFF. As before, the periodic TA timer duration is network specific.
When the Stationary in Cell criteria has been fulfilled, the mobile radio communications device indicates to this network and, as noted, can include the SiC flag within the periodic TA update message and the state of that flag so as to indicate whether the mobile radio communications device has not moved from the cell for at least the time set by the periodic TA update timer. While other arrangements can of course be employed, the optional inclusion of the current cell identifier can also serve as an indication to the network that the mobile radio communications device has become stationary within a particular cell.
According to a particularly advantageous embodiment of the present invention, the temporary signalling area is arranged to coincide with a single cell and thus comprises a single-cell temporary signalling area.
Use of such a single-cell temporary signalling area proves particularly advantageous in enhancing the improved efficiencies, in particular a reduction in signalling overhead and system load that can be achieved by way of the present invention.
As will be appreciated, the signalling managed by way of the present invention can comprise that arising in relation to paging procedures within the network.
In one particular embodiment, the multi-cell signalling areas and the aforementioned temporary signalling area comprise respectively a multi-cell Tracking Area (TA) and a temporary Tracking Area (TA).
The present invention therefore provides particularly useful within a TA management environment of a LTE network system.
In particular, the method includes the step of performing a TA update procedure should the cell phone handset move to a cell that is within the same multi-cell TA but which is not of the said temporary TA.
Such movement can serve to indicate that the cell phone handset is no longer stationary.
The method can include the step of managing a temporary TA list, in which cell phone handsets are included when they are found to be stationary within a particular temporary TA.
Entry upon such a list can advantageously be employed to determine whether or not the cell phone handset is paged by way of the base Station of the temporary TA or whether normal TA procedures are adopted via all of the base stations associated with the multi-cell TA.
The method can further advantageously employ a periodic TA update confirm message so as to confirm for the cell phone handset the nature of the TA within which the cell phone handset is associated at any particular time.
As noted above, the present invention is equally applicable to signalling areas associated with technologies other than LTE, for example 2G and 3G routing and location areas noted above. The procedures then associated with the management of such areas and which correspond to those outlined above in relation to an LTE system are thereby likewise applicable.
It should therefore be appreciated that, by way of the present invention, an improved efficiency in, for example, the paging of mobile radio communication device handsets can be achieved through the reduced number of base stations that will be required for transmitting the paging information to those handsets that meet the "stationary" criteria. The existing TA update procedures can advantageously be employed so that the invention requires no increase in over-the-air signalling, although some additional parameters may be required within currently signalling.
Also, the decision to create/use a temporary TA can be taken within the network rather than at the cell phone handset, and so such TAs can advantageously be created and managed in accordance with overall system load.
Also, the requirement for a temporary TA list in accordance with a particular embodiment of the present invention has relatively minor impact upon network operation.
l'he invention is described further hereinafter, by way of example only, with reference to the accompanying drawing which comprises a signalling diagram illustrating the signalling between a mobile radio communications device operating within a network in accordance with an embodiment of the present invention.
As will be appreciated, a particular concept of the present invention allows the network to optimize its paging procedures by creating a dynamic (temporary) single-cell Tracking Area referred to hereinafter as a "Sleeping Tracking Area" for stationary mobile radio communication device User Equipment (UE) within the cell. The decision to create/destroy the Sleeping Tracking Area is based on information provided to the network by the UE. The network chooses to create the Sleeping Tracking Area based on one or more of a variety of criteria, and then acts to assign the UE to that Sleeping Tracking Area. This way the UE is no longer tracked/paged in its normal multi-cell TA. Rather the network acts to track/page the UE in just this single cell Sleeping Tracking Area. The network continues to broadcast the "normal" LAs within the System Information and so it should be appreciated that the Sleeping Tracking Area is considered a temporary TA, rather than "normal" TA.
This allows the network to page the stationary UE in only one cell and thereby reduces the paging overhead and increasing over-the-air efficiency of the system as mentioned above.
Any number of UEs can join the Sleeping Tracking Area and decisions relating to the establishment/disestablishment of such TAs, and assignment of UEs thereto can be taken in the network. The main criterion is the UE becoming stationary within a cell.
The method can further be arranged such at, once the UE moves outside the cell (i.e. moves from the Sleeping Tracking Area), the network will act to remove it from the Sleeping Tracking Area, and it will be again paged in the "original" manner by way of the cells of the "normal" Tracking Area.
Turning now to the accompanying drawing, there is illustrated a multicell tracking area 10 which, in the illustrated embodiment, comprises three cells of which the respect eNodeBs 12, 14, 16 are illustrated.
The accompanying drawing illustrates the signalling that arises within the tracking area 10 in accordance with an embodiment of the present invention and between a mobile radio communications UE device 18 such as a cell phone handset, and its associated network 20.
It is assumed that, as a first step, the handset 18 moves as indicated by arrow 22. into the cell of eNodeB 12 within the tracking area 10 and that is new to the handset 18.
This serves to establish a tracking area update procedure 24, 26 which will lead to the network 20 paging the handset 18 by way of each of the eNodeBs 12, 14, 16 of the tracking area 10 as indicated by signalling arrows 28, 30, 32.
Thus, although the handset 18 is located only within one 12 of the three cells of the tracking area 10, paging signalling is transmitted from each of the three eNodeBs 12, 14, 16 of that tracking area 10.
As is standard, periodic tracking area update signalling 34 arises and. in accordance with the present invention, such signalling, can include a stationary flag, serving to indicate to the network that the handset 18 is considered to be stationary within the cell associated with eNodeB 12.
Responsive to such a stationary indication within the signalling 34, the network 20 establishes a temporary tracking area, hereinafter referred to as a Sleeping TA I O'as indicated by arrow 36 and, within the periodic tracking area confirmation signalling 38, confirms to the handset 1 8 that it is now to be managed within the Sleeping TA 10'.
In order to enhance the advantages offered by the present invention, the Sleeping TA 10' is arranged to coincide with the cell associated with eNodeB 12 and thereby comprise a simple single-cell TA.
As will be appreciated, the network 20 then knows only to page the handset 18 by way of the eNodeB 12 now associated with the Sleeping TA 10' as indicated by the signalling 40.
That is. only paging signalling 42 associated with the eNodeB 12 is transmitted and the signalling 44, 46 previously arising in relation to the eNodeBs 14, 16 found within the original "normal" multi-cell tracking area 10 is no longer required.
As will be appreciated, this advantageously serves to limit paging overhead and increase the efficiency of over-the-air signalling.
Should it then be determined that the handset 18 is no longer stationary. the handset 18 moves to a new cell as illustrated by arrow 48, such movement is arranged to initiate a tracking area update procedure 50, 52 and the network 20 then adopts a procedure 54 to remove the handset 18 from the Sleeping TA 10'.
Normal paging of the handset 18 by way of the three eNodeBs 12, 14. 16 is then re-established.
Whether or not the Sleeping TA 10' remains established, or is disestablished, depends generally upon whether other handsets are found to remain stationary within that Sleeping TA 10' or, having regard to general network load considerations.
The Sleeping TA 10' thus dynamically created/destroyed by the network.
As noted, the decision by the network to create/destroy the Sleeping TA 10' can be based on criteria such as the number of sleeping UEs in the cell, and/or network load etc. Other non-stationary UEs within the cell will he paged in accordance with normal paging procedures.
The Sleeping TAs would typically be created in more densely populated areas such as in residential or commercial areas. Further the Sleeping TAs are likely to exist for long periods during user inactivity such as at night-time and again during normal office/school hours etc. As noted, improved efficiency in the paging of UEs is achieved due to a reduced number of eNodeBs (LIE Base Stations) that need to transmit paging info for the stationary UEs.
The following steps illustrate a typical basic scenario of the additional functionality introduced by an embodiment of the present invention.
First, the liE enters a cell in a new TA and performs its usual TA Updates Procedures.
The UE will be tracked/paged in all cells belonging to that new TA.
Secondly, it is determined whether or not the UE remains within the same cell. If the UE remains within the same cell for a particular time period, it will perform its normal Periodic Update Procedure.
During this Periodic Update, a "stationary indicator" will be passed to the network as an optional parameter responsive to a determination that the UE is stationary within the cell.
Next, the network saves the stationary indicator parameter and decides whether to create a temporary Sleeping Tracking Area for that UE. This decision can also depend on the number of already existing sleeping UEs in that cell.
If the network decides to create a Sleeping Tracking Area for the UE, it will indicate this to the UE in the Periodic TA Update Confirm Message and on receipt of the Periodic TA Update message noted above. The stationary UE will then be tracked/paged by way of that Sleeping TA only.
Then, if the UE moves to a cell that belongs to the original multi-cell TA (i.e. the TA broadcast in the System Information), the UE will perform a TA update procedure, which of course would not have occurred if the UE had not been allocated to the Sleeping TA. With this TA update procedure, the UE indicates to the network that it is no longer stationary and restores the normal TA principles.
If UE moves to a cell that belongs to different TA the UE follows the existing procedure and performs TA update. Such TA update of course an existing procedure and which inherently indicates to the NW that the UE is no longer stationary.
With an example in which the UE moves from cell the network will then act to remove the UE from a Sleeping TA UE list and will page the UE in accordance with "normal" TA procedures. The network will also indicate this decision to the UE in the subsequent Periodic TA Update Confirm message so that the UE does not behave as if it is still in the Sleeping TA.
As new UEs join the cell and indicate to the network that they are now stationary via the Periodic TA Update message, the network will indicate to the UF that it has joined the Sleeping TA using the Periodic TA Update Confirm Message.
NW removes UEs from the Sleeping TA due to the network deleting Sleeping Tracking Area, the network will indicate to any UEs in the Sleeping TA that they should use the "normal" TA and will indicate this in the next Periodic TA Update Confirm Message on receipt of the next Periodic TA Update message from the UE, and if it decides to delete the Sleeping TA.
As will therefore be appreciated, the present invention serves to optimise paging for mobile phone handsets that are stationary or at least remain within the same cell, or tracking area, for a sufficiently long period of time such as during the night or when a user is found at a constant location such as when at school or in the workplace, to be considered stationary.

Claims (13)

  1. CLAIMS: 1. A method of managing multi-cell signalling areas within a cellular mobile radio communications network, the method comprising the steps of determining if a mobile radio communications device is stationary within a first said signalling area, and assigning the said mobile radio communications device to a temporary signalling area responsive to a determination that the mobile radio communications device is stationary, and wherein the number of cells in the said temporary signalling area is less than the number within the said first multi-cell signalling area.
  2. 2. A method as claimed in Claim 1, and including the step of determining whether or not it is appropriate to establish the said temporary signalling area and/or cancel the temporary signalling area.
  3. 3. A method as claimed in Claim 2, wherein the establishment or cancellation of the temporary signalling area is responsive to information provided from the mobile radio communications device to the network.
  4. 4. A method as claimed in Claim 2 or 3, wherein the establishment or cancellation of the temporary signalling area is responsive to at least one of network load and the number of stationary mobile radio communication devices within a particular cell or signalling area.
  5. 5. A method as claimed in any one or more of Claims I to 4 and including the provision of a stationary indicator within signalling to be delivered from the mobile radio to the network.
  6. 6. A method as claimed in Claim 5, wherein the stationary indicator is provided as part of a periodic update procedure.
  7. 7. A method as claimed in any one or more of the preceding claims wherein the temporary signalling area is defined as a single-cell temporary signalling area.
  8. 8. A method as claimed in any one or more of the preceding claims and arranged for managing paging signalling.
  9. 9. A method as claimed in any one or more oithe preceding claims, wherein the said multi-cell signalling areas and the said temporary signalling areas, comprise respectively a multi-cell Tracking Area and a single cell temporary Tracking Area.
  10. 10. A method as claimed in Claim 9 and including the step of performing a TA update procedure should the mobile radio communication device move to a cell that is within the same multi-cell tracking area but not of the said temporary Tracking Area.
  11. 11. A method as claimed in Claim 9 or 10, and including the step of managing a temporary tracking area list within which mobile radio communications devices arc included when they are found to be stationary within a particular temporary tracking area.
  12. 12. A method as claimed in any one or more of the preceding claims, wherein a decision to create/use a temporary tracking area is taken within the network.
  13. 13. A method of managing multi-cell signalling areas within a mobile radio communications network and substantially as hereinbefore described with reference to. and as illustrated in the accompanying drawing.
GB0709968A 2007-05-24 2007-05-24 Signaling management in cellular mobile radio communications network Withdrawn GB2452691A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0709968A GB2452691A (en) 2007-05-24 2007-05-24 Signaling management in cellular mobile radio communications network
PCT/JP2008/059859 WO2008146868A1 (en) 2007-05-24 2008-05-22 Signalling management in cellular mobile radio communications network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0709968A GB2452691A (en) 2007-05-24 2007-05-24 Signaling management in cellular mobile radio communications network

Publications (2)

Publication Number Publication Date
GB0709968D0 GB0709968D0 (en) 2007-07-04
GB2452691A true GB2452691A (en) 2009-03-18

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GB0709968A Withdrawn GB2452691A (en) 2007-05-24 2007-05-24 Signaling management in cellular mobile radio communications network

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WO (1) WO2008146868A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2449228A (en) * 2007-04-18 2008-11-19 Nec Corp Tracking area signalling for stationary mobile devices in a cellular communications network
KR101090602B1 (en) * 2010-01-29 2011-12-08 주식회사 팬택 Method and Apparatus for managing paging area
EP2628344A1 (en) 2010-10-11 2013-08-21 Telefonaktiebolaget L M Ericsson (publ) A method for associating a tracking area identity list with a user equipment in a wireless communications network
EP2521397B1 (en) 2011-05-06 2013-09-04 Gemalto M2M GmbH Enabling of enhanced cell selection and enhanced paging of stationary terminal devices in a cellular mobile communication network
EP2525614A1 (en) 2011-05-20 2012-11-21 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Selective paging of user equipments in cellular mobile networks
GB2513182A (en) * 2013-04-19 2014-10-22 Sony Corp Telecommunications apparatus and methods
US11277813B2 (en) 2017-12-29 2022-03-15 Telefonaktiebolaget Lm Ericsson (Publ) Paging in a communication network

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995011577A1 (en) * 1993-10-20 1995-04-27 Nokia Telecommunications Oy Location updating in a cellular radio network
WO2000038469A1 (en) * 1998-12-18 2000-06-29 Telefonaktiebolaget Lm Ericsson (Publ) Adaptive location level

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995011577A1 (en) * 1993-10-20 1995-04-27 Nokia Telecommunications Oy Location updating in a cellular radio network
WO2000038469A1 (en) * 1998-12-18 2000-06-29 Telefonaktiebolaget Lm Ericsson (Publ) Adaptive location level

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Publication number Publication date
WO2008146868A1 (en) 2008-12-04
GB0709968D0 (en) 2007-07-04

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