GB2542820A - Base station - Google Patents
Base station Download PDFInfo
- Publication number
- GB2542820A GB2542820A GB1517303.2A GB201517303A GB2542820A GB 2542820 A GB2542820 A GB 2542820A GB 201517303 A GB201517303 A GB 201517303A GB 2542820 A GB2542820 A GB 2542820A
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- GB
- United Kingdom
- Prior art keywords
- base stations
- migration
- base station
- enodeb
- frequency
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- 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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- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 15
- 208000036829 Device dislocation Diseases 0.000 claims abstract description 5
- 238000004590 computer program Methods 0.000 claims abstract 2
- 238000013508 migration Methods 0.000 claims description 19
- 230000005012 migration Effects 0.000 claims description 19
- 230000001413 cellular effect Effects 0.000 description 14
- 230000008859 change Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00838—Resource reservation for handover
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/38—Reselection control by fixed network equipment
Abstract
A base station 3 (or eNodeB) in a mobile network is configured to send parameters (preferably idle mode reselection parameters), modified in accordance with neighbouring base stations processing loads, to connected user entities (UEs) 7 in order to bias mobile device migration towards less loaded base stations. In the figure which shows an embodiment, the frequency priority list contained in System Information Block (SIB) 5 is modified in accordance with current loading so that frequency 3 (used by base station 3c, carrying a lower processing load) is prioritised, resulting in idle-mode cell phone 7 re-selecting to it, though other parameters such as threshold Qrxlevmin may be changed and parameters may be de-prioritised in accordance with higher loads. A central load data store may be used or data may be received directly from neighbouring base stations. The method may be performed via computer program.
Description
Base station
The present invention relates to cellular networks and in particular to a method for setting the idle mode reselection behaviour of cellular devices in a network.
Background
In "Long-Term Evolution" (LTE) cellular networks, wide area macrocell devices are known as eNodeBs and transmit LTE signals over a large geographic areas. Due to range limitations, a number of eNodeBs are deployed such that the edges of coverage overlap so that continuous coverage can be achieved.
User devices, such as cellular telephones, tablets and computers with cellular network adaptors, known as User Entities (UEs) connect to an eNodeB in order to access the cellular network.
In LTE, the UE has three valid states: switched off, idle mode and connected mode. Switched off represents being completely disconnected from the cellular network. In connected mode, the UE is actively engaged in a communication session with another correspondent node via the eNodeB and the LTE network core. In idle mode, the UE is not actively transmitting or receiving, but is connected to an eNodeB and ready to switch to connected mode to enable a communication session, e.g. making a voice call or starting a data session.
In active mode, the eNodeB connected to the UE is responsible for selecting a handover eNodeB when the UE changes location or interference causes the signal strength to the connected eNodeB to drop below a threshold strength. The UE periodically sends cell strength measurements of the signal strength to any nearby eNodeBs to the connected eNodeB and when the signal strength drops below the threshold, the eNodeB uses the strength information to select a new handover eNodeB before closing its connection.
In idle mode the UE itself is responsible for selecting an eNodeB for idle mode association. The UE will typically assess the signal strength to each of the available eNodeBs to determine the eNodeB having the strongest signal and associate with that eNodeB. Since the UE is mobile, the selected eNodeB may change as the relative distances and signal strengths between the UE and the eNodeBs changes.
The UEs receive rules and thresholds governing the initial connection and the manner in which a UE decides to reselect from the connected eNodeB to a different eNodeB. Each eNodeB is configured to transmit the same set of rules and thresholds to all connected UEs in the service area so that all UEs follow the same criteria but decisions are dependent on the observed variables. Each eNodeB uses
System Information Block (SIB) messages to broadcast the rules to its connected active mode and idle mode UEs.
The SIBs are defined in 3GPP TS 36.321 V9.3.0 (R9) and 3GPP TS 36.331 V9.3.0 (R9) and each of the SIBs relates to a different aspect of the LTE network. For example, SIB 1 relates to general information about the available PLMNs, SIB 3 and SIB 5 relate to cell-reselection parameters. SIB messages are broadcast by an eNodeB and received by any UE which is connected to that eNodeB. The UE then applies those rules to determine its future idle mode reselection behaviour.
The information in the SIB messages is generally determined by a system architecture management function of the LTE network at the design stage to maximise coverage based on the geographic deployment of eNodeBs forming the LTE network. For example, when a new eNodeB is deployed, the SIB parameters are loaded into a data store and used by the eNodeB to send parameters to the UEs. Generally these parameters will only be periodically changed by the management function, for example in response to the deployment of a new eNodeB resulting in a necessary change in parameters to migrate UEs to the new eNodeB. Flowever, in general the parameters are static which can reduce the ability of the radio access network of eNodeBs to react to changes in the network.
Embodiments of the present invention address this static behaviour.
Statements of Invention
In one aspect, the present invention provides a method for determining migration parameters in a mobile network of base stations and mobile devices, comprising in each base station: receiving performance data relating to a current processing load of at least one neighbouring base station in the mobile network; processing said received data to modify at least one migration parameter in accordance with the received performance data so as to bias mobile device migration towards less loaded base stations; and sending the modified at least one migration parameter to any mobile devices connected to the base station.
In another aspect, the present invention provides a base station apparatus in a mobile network having a plurality of base stations and mobile devices, comprising: means for receiving performance data relating to a current processing load of at least one neighbouring base station in the mobile network; means for processing said received performance data to modify at least one migration parameter in accordance with the received performance data so as to bias mobile device migration towards less loaded base stations; and means for sending the modified at least one migration parameter to any connected mobile devices.
List of Figures
Embodiments of the present invention will now be described with the aid of the accompanying figures in which:
Figure 1 shows a geographical location in which a UE is located within connectivity range of a number of cellular base stations and an example of a conventional reselection by a UE to a neighbouring base station;
Figure 2 shows the same network of Figure 1 wherein the UE has idle mode reselected to a different base station in accordance with the processing of the first embodiment;
Figure 3 shows an overview of several base stations connected to a centralised base station information data store located in the core network;
Figure 4 shows the functional components of an eNodeB in the first embodiment;
Figure 5 is a flow chart of the processing of an eNodeB in relation to setting a new frequency priority list;
Figure 6 is a flow chart showing more details about the processing of the load controller shown in Figure 5 to calculate new frequency priority values for all neighbour cells; and
Figure 7 is a flowchart showing the operation of each load controller to update the central controller with new load information in the first embodiment.
Description
Summary
Figure 1 shows an example cellular network area 1 which has a number of cellular network base stations 3a, 3b, 3c, each connected to a network core 5 and providing cellular network connectivity to a UE such as a mobile phone 7. The UE 7 is in the idle mode and connected to a first base station 3a. In this embodiment, the cellular network is a Long Term Evolution (LTE) network and the base stations are eNodeBs forming the radio access network of the LTE network.
Since the UE 7 is in the idle mode, it will receive idle mode configuration information from the first eNodeB base station 3a.
In LTE, each base station is configured to broadcast configuration information for configuring any connected UEs. The information takes the form of a number of broadcasted messages known as a Master Information Block (MIB) and System Information Blocks (SIBs). Any UE 7 connected to an eNodeB 3 will receive the reselection configuration data and operate in accordance with the received rules and criteria.
System Information Blocks
The format and structure of SIBs are defined by the 3GPP standard TS36.331 and includes:
System Information Blocks 1, 3 and 5 are particularly relevant to the idle mode reselection functionality of the UEs 7. SIB 1 contains information regarding whether or not a UE is allowed to access an eNodeB based on the associated PLMN.
The SIB 3 messages carry cell reselection information common for intra-frequency, inter-frequency and inter-RAT cell re-selection while SIB 5 messages specify which frequencies the UE should scan when looking for carrier signals of valid reselection base stations (which may include legacy 2G and 3G base stations in addition to LTE eNodeBs), etc.
In the example shown in Figure 1, the first eNodeB 3a is configured to send the following frequency priority information: • Freq 2 priority 6 • Freq 3 priority 4 • Freq 1 priority 3
In this case, Frequency 2 is deemed to be the highest priority and therefore when the signal strength to the first eNodeB 3a drops below a threshold value defined in the SIB 5 parameters the UE 7 will first scan for other eNodeBs using the Frequency 2 band as idle mode reselection targets. If there are no suitable eNodeBs using frequency 2, then the UE 7 will scan frequency 3 for a suitable idle mode reselection target and finally if no higher priority targets are found in frequency 3 then the UE 7 will scan for eNodeBs using frequency 1.
Since the UE is mobile, idle mode reselection can be carried out in response to a drop in the signal strength of the connection to the connected eNodeB 3a due to the presence of interference or a shift in the relative position between the UE and the eNodeB 3a. Another case where the UE may idle mode reselect is where the UE is not connected to the highest priority frequency, for example it is connected to an eNodeB using frequency 1 which is the lowest priority of the three frequencies and therefore the UE will try to move to the highest frequency priority available, i.e. frequency 2, or if frequency 2 is not available, frequency 3. The UE 7 periodically measures the signal strength to the eNodeB 3a and when the signal strength has fallen below a threshold level which is defined in the received SIB messages, the UE will initiate a reselection process to select a new eNodeB from the surrounding available cells in the order of the received frequency priority list.
As shown in Figure 1, when the UE 7 moves away from the eNodeB 3a, due to the frequency priority list in the SIB5 information, it will check frequency 2 since this is the highest priority and at a new location, the UE 7' has disconnected from the old eNodeB 3a and instead connected to a new eNodeB 3b operating on frequency 2.
To improve the reselection ability of UE's 7 in the network 1, in the first embodiment, the eNodeBs 3 can use performance loading information relating to any neighbouring eNodeBs. Based on this information regarding current load, each eNodeB 3 in the network 1 can calculate new frequency priority lists to any connected UEs 7 in order to influence the distribution of UEs 7 to prevent an eNodeB 3 getting overloaded with UE connections.
Figure 2 shows the network 1 where the eNodeB 3b is at 80% load while eNodeB 3c is at 50% load. When the enodeB 3a becomes aware of the neighbouring cell load, it recalculates the frequency priority lists to direct idle mode reselection away from the eNodeB 3b and towards enodeB 3c.
Based on that information, eNodeB 3a modifies SIB5 to contain the following frequency prioritisation: • Freq 3 priority 6 • Freq 1 priority 5 • Freq 2 priority 4
In response to this new priority list, when the UE 7 moves to the same location 7', it will be configured to check frequency 3 first, which will result in idle mode reselection to eNodeB 3c instead of eNodeB 3b.
This prevents the load on eNodeB 3b increasing but the load on eNodeB 3c will increase, while decreasing the load on the previously connected NodeB 3a.
As further UEs (not shown) are directed to the new highest priority frequency from both the current eNodeB and any other local eNodeBs, the load on each of the eNodeBs will change and so at a yet further later time the frequency, the frequency priority list may become: • Freq 1 priority 7 • Freq 2 priority 6 • Freq 3 priority 2.
With this setting, an idle UE 7 will search for other elModeBs using the same frequency (Frequency 1) or stay idle mode connected to enodeB 3a for longer than the other examples and will only switch to searching for eNodeBs 3b on frequency 2 when the signal strength of a frequency 1 eNodeB drops below a further low signal threshold.
By using current neighbour base station load information, each eNodeB 3 can adapt the frequency priority lists to balance the movement of UEs during idle mode reselection to avoid neighbouring base stations which are more heavily loaded.
Figure 3 shows base stations connected to a base station load store 11. The base station load store 11 is connected to each base station in the cellular network and includes eNodeBs 3 in the LTE network and also other base station types which may be idle mode reselection targets. In this embodiment there are NodeBs 13 forming part of a 3G network 15 and legacy base stations 17 in a 2G network 19.
Each base station is configured to upload load information to the base station load store 11 so that at any particular time, any base station can retrieve load information about neighbouring base stations.
EnodeB
Figure 4 shows the functional components of an eNodeB 3 in accordance with the first embodiment.
The eNodeB 7 contains a number of network interfaces for communication with the various network entities. Each interface is dedicated with a different class of network component, namely the MME (not shown) in the EPC 5, UEs 7 and other eNodeBs 3.
As is conventional, the SI interface 21 is for communication with components in the EPC 5 while the LTE-Uu interface 23 is for communication with connected UEs 3 in both active mode and idle mode. The SIB messages and other control plane data are transferred over this interface 23 to the UEs in addition to data plane data between the UE and external network resources (not shown).
The X2 interface 25 is for communication with other eNodeBs 3. This is generally used during handover for UEs 3 which are in active mode.
The eNodeB 3 also includes an interface 27 to the base station load store 11 which is shown separately for ease of explanation. A network interface controller 29 coordinates the flow of control plane and data plane data between the various SI, X2 and LTE-Uu interfaces 21, 23, 25, 27 and internal functions of the eNodeB such as a data plane controller 31, control plane functions 33 and a load information processor 35.
The control plane functions 33 directs processing of control plane information and coordinates communication between the EPC 5 components, UEs 7 and other eNodeBs 3.
The load information processor 35 is responsible determining the eNodeB's 3 current processing load and sending the status update to the base station load store 11. More significantly, it determines revised frequency priority lists for the eNodeB 3 to send to UEs 7. It includes the standard reselection SIB parameters 37, local threshold parameters 39 for deciding when to change priorities of a given frequency based on the load data received from the base station load store 11 and a set of frequency priority list data 41.
Figure 5 is a flowchart showing the operation of the load information processor 35.
In step si the load information for neighbouring eNodeBs is retrieved from the base station load store 11. Neighbours can be identified because the location of each base station or E-UTAN Cell Global Identifier (eCGI) is also stored in the load store 11.
In step s3, new frequency priority lists are calculated based on the retrieved load information.
In step s5 the SIB messages are modified with the new calculated priority list and finally in step s7 the modified SIB lists are broadcast to UEs.
As mentioned above, the new frequency priority lists are generated based on the current frequency priority lists and load information. In particular, when a neighbour base station on a particular frequency is loaded, then the priority of that neighbour's frequency should be decreased to reduce the number of UEs which will idle mode reselect to that neighbour. Conversely, when a base station is not loaded, then the priority of that neighbour should be increased.
The local thresholds 39 definite load percentages when a change to the priority lists should be made, for example, when eNodeB 3b load exceeds 80% then the frequency 2 priority should be set at 4, while when the load of eNodeB 3c drops below 50%then the frequency priority should change to 6.
In this embodiment, the processing of the eNodeBs in the LTE network alters the idle mode reselection behaviour of the UEs in order to balance the load on neighbouring eNodeBs.
Alternatives and modifications
In the embodiment, the frequency priority lists are modified to change the order in which eNodeBs are scanned by the UEs as reselection targets. It will be apparent that such load information is beneficial in active mode handover and so in an alternative, the eNodeB uses the same process for handling handover.
In the embodiment, only the frequency priority lists are changed. However, there are many other SIB 5 parameters that can be (additionally) changed in response to load information. In a modification, the reselection threshold values used by the UEs to determine when to start scanning for a reselection, in this case the value Qrxlevmin is a changed. This modification alters the timing of the initial frequency scan and the timing of scanning on a different frequency.
In the embodiment, the frequency priority lists are modified in the SIB messages sent to all UEs. In a modification, to account for different service levels, the eNodeBs are arranged to determine different frequency priority lists and threshold levels for groups of UEs and to send different parameters using RRC messages.
In the embodiment, a central load store is configured to receive load information from all base stations so that any one base station in the network can retrieve neighbour load information from a single network resource. In an alternative, to reduce the bandwidth usage of such load information messages, the base stations exchange load information with their neighbours using a Self-Organising Network (SON) method.
In the embodiment, the base stations are assumed to be based on the same hardware configuration and therefore will have generally the same processing capacity and capability. However, the specific hardware and configuration of the base stations in a network can vary significantly which will have an impact on how the eNodeBs calculate how quickly to reduce or raise the priority for the frequency used by the neighbouring eNodeB. In an alternative, the cellular network contains a set of macrocell eNodeBs having a high processing capacity and a further set of small cells having reduced processing capacity. Therefore the small cells will reach high processing loads much more quickly and so each macrocell and small cell determine the base station type of any neighbouring base stations and lower the frequency priority much more rapidly for detected small cells to avoid them being overloaded.
Claims (12)
1. A method for determining migration parameters in a mobile network of base stations and mobile devices, comprising in each base station: receiving performance data relating to a current processing load of at least one neighbouring base station in the mobile network; processing said received data to modify at least one migration parameter in accordance with the received performance data so as to bias mobile device migration towards less loaded base stations; and sending the modified at least one migration parameter to any mobile devices connected to the base station.
2. A method according to claim 1, wherein the at least one migration parameter includes frequency priority lists.
3. A method according to claim 2, wherein the at least one migration parameter is modified so that the frequency priority assigned to base stations having a high processing load is a low priority, such that migrating mobile devices are biased away from migration to those base stations.
4. A method according to claim 2 or 3, wherein the at least one migration parameter is modified so that the frequency priority assigned to base stations having a low processing load is a high priority.
5. A method according to any preceding claim wherein the at least one migration parameter includes threshold handover signal strength parameters for frequency priority.
6. A method according to any preceding claims, wherein there are at least two different service priority levels of mobile device and further comprising generating at least two respective values for the at least one migration parameter to differentiate the migration behaviour of the different sets of mobile device.
7. A method according to any preceding claim wherein performance data is retrieved from a central data store in the mobile network containing load information for at least one of the base stations in the mobile network.
8. A method according to any of claims 1 to 6, wherein the performance data is received directly from neighbouring base stations.
9. A base station apparatus in a mobile network having a plurality of base stations and mobile devices, comprising: means for receiving performance data relating to a current processing load of at least one neighbouring base station in the mobile network; means for processing said received performance data to modify at least one migration parameter in accordance with the received performance data so as to bias mobile device migration towards less loaded base stations; and means for sending the modified at least one migration parameter to any connected mobile devices.
10. A base station according to claim 9 wherein the at least one migration parameter includes frequency priority lists.
11. A computer program containing processor executable instructions for causing a processor to perform the method according to any of claims 1 to 8.
12. A mobile telecommunications system having: A plurality of base stations according to claims 9 and 10; and A plurality of mobile devices operable to migrate between said base stations in accordance with received migration parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1517303.2A GB2542820A (en) | 2015-09-30 | 2015-09-30 | Base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1517303.2A GB2542820A (en) | 2015-09-30 | 2015-09-30 | Base station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201517303D0 GB201517303D0 (en) | 2015-11-11 |
| GB2542820A true GB2542820A (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| GB1517303.2A Withdrawn GB2542820A (en) | 2015-09-30 | 2015-09-30 | Base station |
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| GB (1) | GB2542820A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060128394A1 (en) * | 2004-12-14 | 2006-06-15 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for steering idle mobile stations |
| EP2111074A1 (en) * | 2008-01-04 | 2009-10-21 | Huawei Technologies Co., Ltd. | Method, system and network device for obtaining cell reselection priority |
| US20110250891A1 (en) * | 2010-04-10 | 2011-10-13 | Jialin Zou | Method and apparatus for directing traffic between overlying macrocells and microcells |
| CN102469517A (en) * | 2010-11-09 | 2012-05-23 | 中兴通讯股份有限公司 | Method of residence load balance between cells and apparatus thereof |
| US20120135739A1 (en) * | 2009-08-11 | 2012-05-31 | Robert Paterson | Communications system |
| US20120236717A1 (en) * | 2011-03-15 | 2012-09-20 | At&T Mobility Ii Llc | Dynamic control of cell reselection parameters |
| US20150031360A1 (en) * | 2013-07-26 | 2015-01-29 | Samsung Electronics Co., Ltd. | Method and device for load balancing in wireless communication system |
-
2015
- 2015-09-30 GB GB1517303.2A patent/GB2542820A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060128394A1 (en) * | 2004-12-14 | 2006-06-15 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for steering idle mobile stations |
| EP2111074A1 (en) * | 2008-01-04 | 2009-10-21 | Huawei Technologies Co., Ltd. | Method, system and network device for obtaining cell reselection priority |
| US20120135739A1 (en) * | 2009-08-11 | 2012-05-31 | Robert Paterson | Communications system |
| US20110250891A1 (en) * | 2010-04-10 | 2011-10-13 | Jialin Zou | Method and apparatus for directing traffic between overlying macrocells and microcells |
| CN102469517A (en) * | 2010-11-09 | 2012-05-23 | 中兴通讯股份有限公司 | Method of residence load balance between cells and apparatus thereof |
| US20120236717A1 (en) * | 2011-03-15 | 2012-09-20 | At&T Mobility Ii Llc | Dynamic control of cell reselection parameters |
| US20150031360A1 (en) * | 2013-07-26 | 2015-01-29 | Samsung Electronics Co., Ltd. | Method and device for load balancing in wireless communication system |
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| Publication number | Publication date |
|---|---|
| GB201517303D0 (en) | 2015-11-11 |
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