CN102984786B - Communication system - Google Patents
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- CN102984786B CN102984786B CN201210464839.1A CN201210464839A CN102984786B CN 102984786 B CN102984786 B CN 102984786B CN 201210464839 A CN201210464839 A CN 201210464839A CN 102984786 B CN102984786 B CN 102984786B
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Abstract
A kind of communication system is provided, which is arranged to access network by one group of first access path and one group of second access path.First and second access paths have different access technologies.Access path monitor is provided, for obtaining status information relevant to access path according to monitoring process.Access controller is provided, for selecting the access path for communication session according to selection course and according to status information.Modifier is provided, for modifying one of monitoring process and selection course according to modification process and according to decision information or both modifying simultaneously.
Description
Technical field
The present invention relates to one groups for one group of first access path and the second access technology via the first access technology
Second access path accesses the communication system of network, and second access technology is different from the first access technology.This application is also
It is related to a kind of method of the network insertion of access path via different access technologies.
Background technique
In the field of communications, the access path via different access technologies can be obtained to network by providing wherein setter
The system of access be well known.With schematic illustration this point in Fig. 2.Communication system 10(such as mobile phone it is wireless
Communication device) can with the communication path 101 of the first access technology, 102(such as GSM(global system for mobile communications are provided)
Connection, WCDMA(wideband CDMA) connection, WiMAX(World Interoperability for Microwave Access, WiMax) connection, the initiation of WINNER(wireless world
New radio) connection, WLAN(WLAN) connection etc.) station 11 and 12 communicate.Communication system 10 can also be by belonging to
The communication path 103,104 of the access technology different from path 101,102 is communicated with station 13,14.If path 101,102 bases
One of techniques mentioned above technology carrys out work, then path 103,104 can by any technology of remaining technology Lai
It provides.Communication system 10 accesses the calculating of network 15(such as telephone network or such as Intranet or internet via path 101-104
Machine network).
If so that communication system 10 can be accessed from a position via access path 101,102 or 103,104 simultaneously
Station 11-14 and communication system 10 is arranged in the mode of network 15, then this causes management to be selection for implementing and the communication of network 15
The problem of one or more paths of session.
There is the basic condition of a variety of wireless technologys to have possessed some special knowledge the communication of given position, such as described
In the context of environment network (Ambient Networks) (AN), referring to document ISD-2002-507134-AN/WB2/D02
(the written MRA Architecture of Rolf Sigle et al., the 1.0th edition, published on 2 2nd, 2005).The hair of the application
Bright people is also the author/editor of the document, and content is incorporated herein.
In the context of environment network, proposition is connect using described multi radio resource management (MRRM) to manage difference
Enter technology.MRRM function coordinates difference by all mapping the service request to available radio resource to single-hop and multi-hop link
Radio access technologies.Different MRRM targets can be used, radio resource efficiency, service covering or service quality are maximized
It or can be realized the service that can not otherwise deliver by single radio access.Intelligent load in MRRM, which is distributed, to be calculated
Method increases whole effective network capacity.MRRM can include advertisement, discovery, selection, resource monitoring and frequency spectrum and congestion control.It is logical
It crosses monitoring access path and obtains status information relevant to the access path of different access technologies, access controller can basis
Selection course simultaneously selects access path for communication session according to status information.
0 812 119 A2 of document EP discusses the idle or stand-by mode in the mobile station for improving cellular communication system.
IS-136 and GSM standard requirement idle mobile stations (being not in the mobile station during implementing communication session) prison are mentioned in text
Depending on the control channel of neighboring community.0 812 119 A2 of EP proposes that a kind of different standby mode works as measurement according to this mode
When the control channel and other control channels currently distributed, if it is fixed to detect that mobile station has changed into, it can terminate
Measurement more at least within to other control channels.Latter can pass through the reception signal of the adjacent channel of measurement monitoring
Intensity simultaneously realizes the time change in signal strength compared with predetermined threshold.If the variation of received signal strength falls in this
Under threshold value, it is determined that the mobile station is fixed.
Summary of the invention
The purpose of the present invention is to provide a kind of improvement of a group of access path access network via different access technologies
Communication system and method.Note that the purpose is not limited to the system with wireless access technology, because if a group of access path
In one or more access paths be wired binding (wire-bound), then also by generate different technologies access path
Between the problem of making a choice.
The modification that the purpose of the present invention passes through the system of the feature with claim 1, feature with claim 23
The method and computer program as claimed in claim 25 of device, control as claimed in claim 24 to the access of network
Product is realized.Advantageous embodiment is described in dependent claims.
According to the present invention, a kind of communication system is provided, which is arranged to one group via the first access technology
One access path and one group of second access path of the second access technology access network, wherein the second access technology is different from the
One access technology.The communication system can be terminal, such as can be according to the mobile phone of a variety of wireless technical communications or this is logical
Letter system itself can be network, such as personal area network.One group of first access path can have one or more members, and one
The second access path of group can have one or more members.Naturally, communication system can be set into via not more than two kinds
The access technology of same type accesses network.
A kind of access path monitor is provided, for obtained according to monitoring process with one in the first access path or
The relevant status information of state of one or more access paths in the state of multiple access paths and the second access path.It obtains
Win the confidence breath can be by performing measurements to realize to interested access path, or can be by other means (such as from network
Receive) it obtains.Note that any suitable access connection of term " access path " description, such as single link, multiple continuous chains
Road or whole subnet.
Moreover, access controller is also provided, for the state according to selection course and according to the acquisition of access path monitor
Information selects the access path for communication session from the first and second access paths.Selection preferably not only includes most primary election
Select one or more paths of the given session for that will establish, and including then when communication session is in active state,
The session of foundation is switched to the access path or vice versa of the second technology from the access path of the first access technology.
Moreover, according to the present invention, a kind of modifier is provided, for modifying prison according to modification process and according to decision information
Depending on one of process and selection course or both.Modification can for example (such as be obtained by parameter used in change procedure
Take the frequency of status information) it realizes in any suitable or desirable way.Modification can also include change procedure or customary journey
Sequence itself, such as by from a subroutine or pattern switching to another subroutine or mode.
According to the present invention it is possible to by modification process flexible and dynamically adjust monitoring process and/or selection course.This is provided
Optimum management to the access path of different technologies.More specifically, to optimize cost caused by monitoring process (such as just
For signaling overheads, energy consumption etc.) and selection course provided by benefit (such as with regard to improved service quality for) between put down
The mode of weighing apparatus is come to control modification be possible.It can be in the case where impractically calculating value at cost or benefit values, such as pass through
Simply analysis carrys out the balance of cost of implementation and benefit for previously establishing cost and benefiting the preassigned of balance.This mode
Another example is if the power supply of communication system is higher than predetermined threshold lower than the signal quality on predetermined threshold and active access path
Value then stops status information of the measurement in relation to observed access path, because in this case, it is believed that the cost in terms of the energy
Prior to improving any benefit in communication quality.On the other hand, such as based on mathematical function and suitable inquiry table define
Ground calculates value at cost and/or benefit values, is then modified according to the relationship between value at cost, benefit values or value at cost and benefit values
Monitoring and/or selection course are also possible.
Detailed description of the invention
From description of preferred embodiments referring to the attached drawing below, these and other advantages of the invention will become more to show
See, in which:
The schematic diagram that Fig. 1 shows the embodiment of the present invention indicates；
Fig. 2 shows can be via the setting of multiple access paths and the communication system of network communication；And
Fig. 3 shows the flow chart of embodiment of the method for the invention.
Specific embodiment
Fig. 1 shows the embodiment of the present invention, and wherein idea of the invention is applied to ambient network scenario.Reference signs 10 are retouched
Communication system is stated, which can be a unit, such as portable telephone device, or can be distributed entities is
System, such as personal area network.Communication system 10 is described as including multiple connection entity 25-28 in schematic form, wherein each
Connection entity is for establishing one or more communication links according to different radio access technologies.For example, connection entity 25
It can be set into and establish WLAN link, connection entity 26, which can be set into, establishes WCDMA link, and connection entity 27 can be set into
Establishing WiMAX link and connection entity 28 can be set into and establishes WINNER link.It, can be with naturally, these are only examples
More or less different wireless access technologys is provided, and other wireless access technologys can be used and proposed to substitute as example
Those of technology.
Communication system 10 has generic link layer (GLL) entity 24 and multi radio resource management (MRRM) entity 200.
GLL entity 24 includes making a variety of be wirelessly electrically accessed that can and be easy to implement efficient link layer interworking between 25-28
General utility functions.The concept of GLL is well known in the art, therefore without further describing.MRRM entity provides more for managing
A general utility functions for being wirelessly electrically accessed 25-28.For this purpose, MRRM entity 200 includes access controller 22.It is according to the present invention
Embodiment, also offer access path monitor 21, access path monitor 21 are arranged to obtain and communication entity 25-28 offer
The relevant status information of state of one or more access link 201-206.Controller 22 according to an embodiment of the present invention is arranged
It is from different access paths at the status information enabled it to according to selection course and according to the offer of access path monitor 21
Communication session selects access link.MRRM entity 200 further includes modifier 23, modifier 23 be arranged to according to modification process and according to
One of the monitoring process of access path monitor 21 and the selection course of controller 22 or same are modified according to decision information
Both Shi Xiugai.Entity 29 is also shown in Fig. 1, which summarizes communication system 10 for sending or receiving number in schematic form
According to every other entity.For example, entity 29 will wrap if communication system 10 is mobile terminal, such as portable telephone device
Include the well known function of providing on link layer, such as phone application, multimedia application.
As already mentioned above, the system that communication system 10 can be unit or distributed entities.Similarly, road is accessed
Diameter monitor 21, access controller 22 and modifier 23 can provide in a unit, such as in a programmable processor
Middle offer, or the individual entity that can be distributed across on different location.According to preferred embodiment, communication system 10 is can to make
The multiple unit being wirelessly electrically accessed, such as mobile terminals, and monitor are realized at least two different radio access technologies
21, controller 22 and modifier 23 are all provided as the function in programmable processor.
It is indicated as method, the present invention can be as shown in Figure 3 to implement, and wherein the process illustrates access path prison
The monitoring process S31 that visual organ 21 executes, followed by the selection course S32 executed by access controller 22, followed by modifier 23
The modification process S33 of execution.Naturally, Fig. 3 is only an example, these three processes can also be concurrently provided.
From above it is thus seen that, any suitable combination that the present invention can be used as hardware, software or hardware and software comes real
It applies.
In Fig. 1, communication system 10 can be considered as environment network.Fig. 1 shows second environment network 80, it includes being used for
The communication entity 31-34 and 41-43 of link are established with communication system 10.For example, entity 31 can be closed with WINNER access technology
Connection, entity 32 can be associated with WLAN access technology, and entity 33 can be associated with WCDMA access technology and entity 34 can be with
WiMAX technology correlation.Similarly, communication entity 41 can be associated with WCDMA access technology, and entity 42 can be accessed with WiMAX
Technology correlation and entity 43 can be associated with WINNER access technology.Communication entity 31-34 is associated with GLL entity 35, communication
Entity 41-43 is associated with GLL entity 44.In the example of fig. 1, two GLL entities 35 and 44 are associated with shared MRRM entity 50.
Environment network 80 further includes to the connection of communication network (being not shown, such as telephone network, Intranet or internet) or gateway entity
60。
For example, communication entity 31-34 can be associated with a wireless base station, communication entity 41-43 can be with another nothing
Line base station association.Similar to the description of communication system 10, environment network 80 can also be a unit or can be dispersed in multiple
On position.Therefore, entity 31-35,41-44,50 and 60 described just now can be located at together or be dispersed in multiple positions and
On each network.It will therefore be noted that the expression of Fig. 1 is schematical, and along the entity in the hierarchical structure of communication layers
Logic be arranged to orient.
In the example of fig. 1, link 201 is WLAN link, and link 202 and 204 is WCDMA link, link 203 and 205
It is WiMAX link and link 205 is WINNER link.For example, access path monitor 21 is available with WLAN link 201
State and the relevant status information of the state of WCDMA link 202 and 204.In this case, WLAN link 201 can be considered as one
The example of the first access path of group, WCDMA link 202,204 can be considered as one group second different from first group of access technology
Access path.
In the example of fig. 1, monitor 21, access controller 22 and modifier 23 are illustrated as a part of system 10.But
Be, it should be noted that entity 21,22 and 23 one of them, two or whole entity can also provide in environment network 80.?
In this situation, entity 10 and 80 is constituted together implements communication system of the invention.For example, monitor 21 and modifier 23 can be
It is provided in MRRM entity 50 or in one of GLL entity 35 and 44.Similarly, entity 21,22 and 23 can be dispersed in
On entity 10 and 80.For example, monitor 21 can have a part in MRRM entity 200 and with one in MRRM entity 50
Part, and/or with a part in GLL entity 24,35 and 44.This is equally applicable to access controller 22 and modifier 23,
I.e. these entities can be spread in the same manner.
The acquisition of information can realize in any suitable or desirable way, such as by just desired in communication system 10
Parameter executes measurement, and signal quality on the desired all links in this way of parameter (measures, example in any suitable or desirable way
Such as measured as the bit error rate, signal strength indication, interference level), load value (surveys in any suitable or desirable way
Amount, such as measured as the quantity of the shared different terminals device for giving link, as utilization rate etc.) etc..On the other hand, also
The information can be otherwise obtained, such as receives the message from environment network 80, environment network 80 can execute measurement simultaneously
It transmits the information measured or this type of information can be received from the communication network of overlapping.
Status information can indicate in any suitable or desirable way, such as it can be and for example indicates that " link can not
With " message qualitative information or it can be such as given parameters numerical value quantitative information.
It can be in any suitable or desirable way come selection the connecing for communication session from the first and second access paths
Enter the selection course in path.The present invention is not limited to any specific selection course because selection course can according to a large amount of preferences and
Strategy selects.
For example, selection course can be selection have best quality link or it can be selection have it is minimum
The link of load or it can be that selection consumes the link etc. of the minimum energy.Note that in the present invention, access path
Selection can be selection for carrying an access path of a communication session or selection can be for carrying one
Multiple access paths of communication session.For example, in Fig. 1, by any one link of link 201-206 or institute can be passed through
The more than one link of link is stated to carry session, for example, can be carried by WLAN link 201 session a part and
Another part is carried by WCDMA link 204.
Selection course may include that initial selection is used for the access path of new session, and is also preferably included in difference and connects
Enter between the access path of technology switching for established communication session and the communication session still in active state a possibility that.
For example, access controller 22, which can be set into, executes selection course, so as to the shape based on acquisition in Fig. 1
Movable session is switched to WLAN link 201 from such as WCDMA link 204 by state information, such as the signal matter on link 204
Link-quality when amount is fallen under threshold value, when the load on link 201 is fallen below a predetermined threshold or on link 201 is super
The link-quality and link 201 crossed on link 204 executes above-mentioned switching when can be used.
Can modification process be selected according to desired strategy and desired target in any suitable or desirable way.Modification
Decision information used in modifier 23 in the process will equally depend on desired strategy or target.This will from the description below in
Example will be readily understood that.
For in a general sense, the modification (one of selection course and monitoring process or both have concurrently) of process can
With include parameter used in change procedure (such as change monitoring process obtain status information frequency, change access path prison
Visual organ will acquire that status message is forwarded to the frequency of access controller or change selection course makes a choice the frequency of decision), or
The step of modification can also be adjustment process itself.Latter situation can be for example, by including multiple subroutines or mould
The process of formula simultaneously makes to modify process choosing subroutine or mode to realize.As the example of latter situation, process is monitored
It is imagined as in the first mode, a large amount of access paths is measured with high-frequency, so that the mode is energy-intensive, and the
In two modes, less access path is measured with lower frequency, i.e. second mode is that energy is less intensive.In this way, according to
The energy state (such as battery status) of associated decision information, such as communication system, can choose corresponding monitoring mode.It changes
Yan Zhi selects the mode of consumption less energy if the energy state of communication system is low (be lower than predetermined threshold), and if
The energy state of communication system is high (being higher than predetermined threshold), then selection has the mode of greater energy consumption.
As already mentioned, the modification of monitoring process and/or selection course may include the frequency that modification obtains status information
Status message is forwarded to the frequency and/or modification selection course of access controller by rate and/or modification from access path monitor
The frequency for the decision that makes a choice.Obtain status information frequency (such as the lower access path of observation is executed the frequency that measures with
And the frequency of forwarding status information) it is the magnitude of energy, processing capacity and signaling overheads put into monitoring and selection operation
Measurement.Therefore, if expectation reduces the influence of this investment in some cases, decision information is selected as to judge certain
Situation presence or absence is (for example, certain is it may be the case that the low power state or high disposal device of communication system load, then correspondingly
Trade-off decision information, such as the power rating or processor state of communication system), it, then can be with and if there is certain situation
It reduces one of frequency mentioned above or reduces by two kinds of frequencies simultaneously.It on the other hand, if will monitoring or selection course
It is adjusted to pay little workload, then related certain situation mentioned above no longer existing be determined as can be used and pass through
Increase one of frequency mentioned above or increases by two kinds of frequencies simultaneously to modify monitoring process and selection course wherein
One or both of basis.
Alternatively or additional mode, modification monitoring process can also include modification to one or more access paths
The status information of acquisition.For example, this may mean that the type of change information, such as switch to another kind from a type of information
The information of type adds supplement of the information of new type as old type.For example, if access path monitor 21 in Fig. 1
Just in the signal quality information of to acquisite approachs 201, then modifying monitoring process can be to be switched to monitoring load information, or can be with
It is additionally to monitor load information.
Alternatively or additional mode, modification monitoring process can also include the access that modification obtains its status information
The quantity in path.Such as, if it is desired to the workload paid on monitoring access path is reduced, then can reduce the access road of observation
The quantity of diameter.Modification process can also be arranged to by modifying from wherein access road of the selection for the access path of communication session
The quantity of diameter modifies selection course.In other words, selection course can be selection is not executed to all available access paths but
Only selection is executed from limited set.For example, the selection course that access controller 22 executes can only consider to select in Fig. 1
Link 201,202 and 204 is selected, although other links are also available.According to the present invention, modification process may include increasing to add deduct
Selective access path is considered less.Continue to discuss the example mentioned just now, if it is desired to reduce the work paid in selection operation
It measures, selection course can be modified by removing link 202 from the set for considering selective link, thus only in link
It is selected between 201 and link 204.Note that the modification of selection operation can even subtract the set of the access path of consideration
Less to a path, selection operation is thus actually disabled.Similarly, the quantity of the access path of modification monitoring process monitoring
This quantity can be reduced to one or zero access path, thus actually disable monitoring process.
Referring now to public in the document IST-2002-507134-AN/WP2/D02 mentioned above in relation to environment network
The example known modifies monitoring process or selection course to explain through the corresponding number of the access path of modification consideration.Coupling collar
Border network and multiple radio access links, the multiple set of well-known definitions:
The set (DS) detected, it is that available and environment network can be in all access link potentially connected
Set.Some access link not yet may definitely be measured and detect, but known to because of contextual information may be, i.e.,
It may be from some position, certain is wirelessly electrically accessed and is available (such as the WLAN heat positioned at airport known to MRRM entity
Point).It is such to be wirelessly electrically accessed and be noticed by being wirelessly electrically accessed advertisement information.
Candidate collection (CS), it is the subset of the set detected, and can be by environment network for being connected to one
Other a or multiple networks.The set detected may be comprising being not belonging to wirelessly being electrically accessed for candidate collection.For giving environment
Network, these are wirelessly electrically accessed the technical restriction that may be wirelessly electrically accessed by policy reason or access net using certain due to are refused
Absolutely.
- MRRM active set (AS), it is the subset of candidate collection.MRRM active set is included as some communication session
And all of active management are wirelessly electrically accessed.For different sessions, there may be different MRRM active sets.MRRM active set
Only comprising also meeting the predetermined minimum requirements for example in terms of radio link quality or in relation to system load in candidate collection simultaneously
And also meet the element of the service specific requirements of communication session.Latter require can be quality of service requirement (such as data speed
Rate, delay, shake etc.), and can also be security requirement (such as encrypted transmission, transmission of certification etc.).
- GLL active set, it is the subset of MRRM active set.GLL active set includes can be by one or more GLL
Entity is dynamically assigned to the multiple of communication session and is wirelessly electrically accessed.
In the example of fig. 1, the set detected can be for example whole link 201-207, and wherein link 207 is instructed to
It is not used for communication system 10 but is available link.Candidate collection can be such as link 202-206, and MRRM active set
It can be such as link 203-206.Finally, GLL active set can be for example all with the associated link 204- of GLL entity 44
206。
In the communication system of the set of text is mentioned in use access link or access path, modification process may include
Change the link in any one or more set of set mentioned above or path.For example, the modification of monitoring process can be with
The modification of quantity and selection course including link or path in change MRRM candidate collection may include change GLL living
The quantity of link or path in dynamic set.
As already mentioned previously, modifier can be selected to monitor using to modify in any suitable or desirable way
One of journey and selection course or the decision information of both modifications, specifically depending on desired target and strategy.
According to an example, decision information can at least partly be led from the status information that monitoring process is obtaining
Out.For example, the status information may include the survey to the signal quality for the access path for currently being used to carry communication session
Amount, and the measurement to other signal qualities that can access link.This signal quality information can be modified below Cheng Yiru
Formula is used as decision information.If the signal quality on currently used access path is more than predetermined threshold, monitoring can be disabled
Process and selection monitor that process and selection course are activated if opposite signal quality is lower than threshold value.
Decision information can be identical with status information, or can handle status information for exporting decision letter
Breath.For example, the time rate of change (time diffusion) of the parameter can also be used as decision if status information is parameter
Information.
As status information, decision information can also be any desired type, that is, it can be qualitatively, such as
Indicate " link is unavailable " message or it can be quantitative, such as numerical value.According to preferred embodiment, decision information includes
Numerical value.It is highly preferred that these numerical value include the value of one or more decision parameters.The example of such decision parameters can be above
The state parameter mentioned, such as signal quality or load on access path.Modification process then may include by with decision parameters
One of associated parameter value and corresponding threshold value comparison.For example, if signal matter on currently used access path
Magnitude is higher than the load on predetermined quality threshold value and/or currently used access path and is lower than predetermined load threshold value, then modifies
Journey can correspondingly modify monitoring process and/or selection course, such as the letter of the access path in relation to monitoring is obtained by reducing
The frequency (until disabling monitoring process) of breath and the quantity by reducing the selective access path of consideration were (until disabling selected
Journey) it modifies.
Another example for the numerical value for including in decision information is one or more parameters in the decision parameters mentioned
Rate of change value.Can be used as modification process a part will derived from given decision parameters these rate of change value and corresponding threshold
Value compares.For example, if the time diffusion of the signal quality on currently used access path is lower than quality change rate threshold,
And/or the time diffusion of the load on currently used access path is lower than predetermined load change rate threshold value, then modification can wrap
It includes to reduce and executes the workload that monitoring process and/or selection course are paid, such as obtain different access technologies by reducing
The rate of the status information of access path is modified.
From example above, it can be seen that, decision information may include business load instruction.This instruction can be quantitative or fixed
Property information, and it may be an indicator that business load in business load or larger context on individual path, such as considered
Entire environment network in business load.Decision information can also include that derived information, such as industry are indicated from business load
The time diffusion of business load value.
Decision information can also include that signal quality indicates, signal quality instruction can be quantitative information or qualitative letter
Breath.Signal quality instruction can indicate the signal quality on currently used one or more access paths for communication session
Or the signal quality on the access path monitored.Decision information can also include that derived information is indicated from signal quality,
Such as the time-derivative of signal quality value.Such as, if it is determined that the change rate of the signal quality on access path monitored
It falls below a predetermined threshold, then the frequency for obtaining status information can be reduced by modifying process, because high-frequency is unnecessary.
As additional mode or alternate ways, if communication system is mobile device, decision information may include communication
The instruction of the speed of system.If the speed of communication system is fallen below a predetermined threshold, the process of modification can be supervised by reducing
Depending on and the selection access path mode of workload paid adjust monitoring process and/or selection course.That is, if communication system
It unites and only very slowly moves or do not move completely, then monitoring and selection course do not have too many expected benefit, thus may the phase
Hope the workload for reducing and paying.
Alternatively or additional mode, modification process can make decision information include money available for communication device
The instruction in source.Such resource can be such as power resource (such as battery power level) or process resource (such as processor quilt
The degree utilized).As previously noted, it if available resources are low (such as power is low or free processing capacity is few), modifies
Process can modify monitoring process and/or selection course by way of reducing paid workload, such as pass through reduction
The mode of the frequency of status information is obtained to modify.
As in summary of the invention it has been mentioned that according to the implicit analysis or implicit costs of cost and/or benefit and can obtain
The selection of benefit balanced to realize modification process and associated decision information.But decision information can also include using clear
Cost and/or benefit values.That is, decision information may include the estimation benefit values and estimation of multiple and different settings of monitoring process
One of value at cost or both has concurrently.Similarly, decision information may include estimating for multiple and different settings of selection course
One of benefit values and estimated cost value or both are calculated to have concurrently.It is the cost function for monitoring multiple access paths as follows
Example:
Wherein CMonitorIt is monitoring cost, fMonitor,iIt is the frequency for monitoring access path i, CMonitor,iIt is monitoring access road
The cost of diameter i.All access path i summation to monitoring.Cost CMonitor,iIt can come in any suitable or desirable way
It indicates, it can be dimensionless variable or can be indicated according to parameter (such as according to consumption energy).It is similar to formula (1),
The cost that the status information of access path monitor is transmitted to access controller can be indicated are as follows:
Wherein fForward,iIt is the frequency for forwarding the status information of access path i, cForward,iIt is the shape for forwarding access path i
The cost of state information.
Cost for executing selection operation or the benefit for executing monitoring process and/or selection course, can design
Similar function.
For example, modification process can calculate monitoring cost, and if totle drilling cost C by formula (1) according toMonnitorIt is more than
Predetermined threshold, then by monitoring frequency fMonitor,iIt is modified to make CMonitorIt falls under threshold value again.
Note that cost and/or benefit can be determined according to the mathematical function provided in examples above (1) and (2),
But cost and/or benefit for example can also be determined based on multi-dimensional table or mapping, wherein value at cost and/or benefit values are distributed
To vector of input parameter value, such as vector, the quantity of the access path monitored of frequency values of monitoring etc..
As another alternate ways or additional mode, decision information used in modifier may include communication system
The preference information that one of operator of user and network or both is all arranged.For example, the user of communication system can have
There is the preference to certain access technology, and modifier can be set into always to monitor the preference in available situation
The mode of the access path of access technology modifies monitoring process.
As another alternate ways or additional mode, modifier, which can be set into, makes decision information include selection course pair
The instruction of the momentary sensitivity of the timeliness of status information.When monitoring access path and executing selection course, there are collection shapes
State information and in the selection process using postponing between the status information the problem of.This delay is by acquisition status information
Required time and by status information from access path monitor be forwarded to access controller needed for the time cause.Moreover, this
Delay depends on obtaining the frequency of status information and status information is forwarded to the frequency of access controller from access monitor.
That is, if the status information of the given access path monitored is eachAccess controller is reached, then in the periodKnot
Shu Shi, momentary status may have sizable change.Therefore the momentary sensitivity of selection course may be that modification monitored
Important parameter when one of journey and selection course or both modifications.Such as, if it is determined that momentary sensitivity is higher than predetermined
Threshold value, then the frequency of status information can be obtained and modify monitoring process by increasing by modifying process, and otherwise still, if
Momentary sensitivity is lower than predetermined threshold, then the frequency for obtaining status information can be reduced by modifying process.The sensitivity can be such as
It is indicated according to the differential of the mathematical selection function of input state parameter value.
As another alternate ways or additional mode, modifier, which can be set into, makes the modification process include that determination is
The no one or more service requests for meeting communication session.Service request can be selected in any suitable or desirable way, such as
It can be data-rate value or certain other qos measurement.By correspondingly defining associated threshold value, satisfaction is set
Standard.For example, if the communication session of the user of communication system is voice communication, it may be considered that such as 50 kbps of number
Be according to rate-valve value it is enough, as a result, if one or more momentary access path provides this data rate, even if new access
Path is available and has higher data rate, is switched to new access path and benefits still without what.Therefore, if meeting service
It is required that then modifier can modify monitoring process and/or selection course, example by way of making paid workload reduction
If modified if momentary access path is more than threshold data rate by disabling monitoring process and selection course.
The present invention relates generally to the prisons for the communication system for allowing to the access path access network via different access technologies
It can adjust or modify in a dynamic fashion depending on process and/or selection course, so as to dynamically adjust execution monitoring and selection institute
The workload paid is relative to the balance between resulting benefit.In general, the balance between cost and benefit are as follows: when
When desired benefit reduces, the workload that monitoring and selection are paid can be reduced, and vice versa.For example, if operation prison
Status information (such as infrequently executing measurement) is infrequently obtained depending on process, then which reduce the quantity of signaling overheads and drops
Low energy consumption.Meanwhile selection course must be based on not timely status information and make decisions, this may be decreased execution and selected
The benefit of journey.
As some examples above are already indicated above, access path monitoring (monitoring process) and access controller (selection course)
It can be modified according to following one or more input parameters:
Change rate experienced in business load and business load.If business load is lower than predetermined threshold and/or industry
The change rate of business load is lower than threshold value, then can reduce monitoring frequency.
Change rate experienced in access path quality and access path quality.If access path quality is higher than predetermined
The change rate of threshold value and/or access path quality is lower than threshold value, then can reduce monitoring frequency.
The quantity of user in environment.If user is few in environment, the benefit of multi-user diversity is low.In this situation
In, diversity gain can be by selecting access path to realize based on instantaneous access path quality.If there is many users, then
Little diversity gain may be implemented.Diversity gain is a type of benefit.Therefore, according to the user in communication system environment
Quantity, selection course can be modified, for example, if the quantity of the user in environment increases above predetermined threshold, then reduce selection
The quantity of the access path considered in the process, and modify monitoring process correspondingly also to provide suitable status information.
If multiple access paths are available, they are categorized into different sets, such as described previously for the collection detected
What conjunction, candidate collection, MRRM active set and GLL active set were explained.The set according to belonging to access path, it is adjustable
Obtain the frequency of status information.
The desired performance of user.The example of user preference be desired performance (such as desired service quality (QoS) or
Desired data rate) instruction.If user reaches desired performance, monitoring process can be reduced and selection course is paid
Workload out.
The performance that network allows.If user reaches the performance that network allows him to reach, such as with regard to service quality or number
For rate, then the workload that monitoring process or selection course are paid can be reduced.
The power of battery of communication system.If the electricity of communication system is low, can reduce in access path monitor
Obtain the frequency of status information, it is possible to reduce the frequency of forwarding status information in access controller, and can reduce and select
The processing work that journey is paid.For example, if the power of battery is fallen below a predetermined threshold, can actually disable monitoring process and
Selection course.
System resource.The implementation of selection course can generally improve having for the system resource in communication system and network simultaneously
Effect utilizes.But if having there is enough system resource can be used, (value of i.e. corresponding system resource measurement is higher than predetermined threshold
Value), then the workload paid in monitoring process and selection course can be reduced, such as reduce the frequency for obtaining status information.
User behavior.If communication system is mobile station, and the user of communication system is more than scheduled threshold speed
Fast movement, then state parameter may quickly change.Therefore, expectation increases the frequency for obtaining status information in this case, with
Just there is timely status information.
When the frequency of modification acquisition status information and the frequency of forwarding status information, tactful and desired target may be
It is diversified.In this regard, it can for example consider service standard, resource criterion or MRRM performance standard.Service standard definition
Meet the degree of service and/or the requirement of user.The example of service standard are as follows: reach minimum quality of service threshold value? it is another
Does is a example: it is required that or it is expected to reach higher service quality level? for example, with high-resolution or higher rate
Access path can be used for spreading defeated? or another example is whether to be worthwhile for the promotion of service performance and generate additional
Cost (such as cost for finance)?
Resource criterion defines the significance level of transfer resource.Example is: whether system resource is limited or highly-utilized (such as high negative
Carry) and go back that remaining how many resource can be used? whether the power of battery low?
MRRM performance standard is related to the estimation benefit of multi radio resource management or what gain is.In a variety of researchs,
Many MRRM algorithms are had studied to select the radio link connected for user.Input parameter can be link-quality, service
It is required that, system load etc..These algorithms, which have been displayed, can be provided from the substantial gains of performance to the every of only very small gain
Kind situation.Gain benefits to depend on many aspects: using what radio access technologies, using what deployment mode, just clothes
For business region (such as radio plot) how distribution service demand, service request what is, selection course is used it is assorted
Input parameter and using what selection algorithm, how many user in systems, (such as the variation due to link-quality, institute
Multiple access diversity gain can be provided with selection course.The case where for a large number of users, there is multi-user diversity gain, it utilizes letter
Road variation.If reaching a large amount of multi-user diversity gains, still have a little additional gain for access selection diversity) execute monitoring
Process is related to what cost (for any desired measurement) and this uses up and has reached or the journey of accessible benefit/gain
It spends, what the position of MRRM input parameter is.For in this regard, the delay of the precision, distribution measuring estimated in system and can
The degree (such as variation of load caused by user mobility and link-quality) of denaturation plays effect.
As combining environmental network is explained, multiple set can be defined to execute different MRRM function to these set
Energy.These most of functions need to obtain the monitoring process of status information.In the set and candidate collection detected, monitoring is mentioned
For the occasional information in relation to such as information element of link-quality, load etc..It, can be by access path based on this monitoring input
It moves on in MRRM/GLL active set.In active set, MRRM executes selecting and connecing for user conversation distribution for access path
Enter path.In order to realize this purpose, be desired to have more accurate monitoring process, for example, more frequently obtain status information and/or
Obtain more different types of status informations.Hereafter example is another embodiment of the invention in this context:
It is based on service standard, resource criterion and/or MRRM performance standard, in that case it can be decided that selection course in MRRM is to assorted
Degree is feasible.If there is no problem or desired benefit is little, the workload paid can be maintained at low water
It is flat.For example, the size of dynamic set and candidate collection can be remained scheduled smallest number.If active set size is limited to
1, then it is practical not execute selection course.Moreover, the quantity of the alternative access paths in candidate collection can be limited in a similar manner.
It, can root if executing selection course (such as active set includes multiple elements) on multiple access paths
Suitable access selection algorithm is selected according to the system parameter of such as access path quality, service, load or combinations thereof etc..It can be with
Access selection frequency is adjusted according to the dynamic change of the sensitivity of the input parameter of access selection function and system parameter.Example
Such as, if using out-of-date input parameter (such as load or link quality values of measurement), the gain of MRRM or benefit will be reduced.
Meanwhile resource consumed by monitoring process reduces.If the variability of system increases, status information is obtained it is expected that also increasing
Frequency and/or the frequency for selecting access path.
It may be noted that is involved is embodiments shown in FIG. 1 for many of the above example.Although Fig. 1 constitutes of the invention excellent
Embodiment is selected, but the present invention is not limited to this.For example, the invention be not limitedly applied to one group first via the first technology
Radio access links and one group of second radio access links of second access technology different from the first access technology connect
Enter the communication system of network.I.e. the present disclosure additionally applies for the more common access path situations that can be multi-hop relay link.And
And access path needs not to be radio access paths, because the present disclosure applies equally to the access in radio roads of different access technologies
The case where diameter.
Because the present invention is not limited to wireless communication field, it can also be applied to medium Route Selection field.It can
Receiver is transferred data to via heterogeneous networks to use the network of overlapping.Medium port makes a choice the road of suitable network
By trade-off decision.For this purpose, medium port obtains the monitoring information of state (such as load) and ability in relation to heterogeneous networks.This
The monitoring process that can be considered as in meaning of the present invention.The complete subnet of process assessment is monitored in this case.It can be by measuring
The feedback information of process (link ping packet trains), End-user services quality report or subnet specific management function forms.
Although the present invention is described with reference to preferred embodiment, these embodiments are merely to illustrate the present invention, and exhausted
It is not limitation.The present invention is defined by the following claims.Quotation mark is for making claim be easier to read, without appointing
What limitation influences.
Claims (15)
1. a kind of communication system (10), the communication system be arranged to via the first access technology one group of first access path and
One group of second access path of the second access technology accesses network, and second access technology is different from the first access skill
Art, the communication system include:
Access path monitor (21), for one or more of being obtained according to monitoring process with first access path
The relevant status information of state of access path and one or more access paths in second access path,
Access controller (22), for according to selection course and according to the status information from first and second access path
Middle selection is used for the access path of communication session, and
Modifier (23), for modifying the monitoring process and the selection course according to modification process and according to decision information
One of or both to optimize provided by cost caused by the monitoring process and the selection course between benefit
Balance, wherein the modifier be arranged to make the modification process comprise determining whether one that meets the communication session or
Multiple service requests.
2. communication system as described in claim 1 is lived wherein the access controller is arranged to be in the communication session
Switch the communication session between first and second access path when dynamic state.
3. the communication system as described in any one of claims 1 or 2, wherein modifying the monitoring process includes that modification obtains institute
State frequency used in status information.
4. the communication system as described in any one of claims 1 to 2, wherein modifying the monitoring process includes that modification will be described
Status information is forwarded to frequency used in the access controller from the access path monitor.
5. the communication system as described in any one of claims 1 to 2, wherein it is described including being revised as to modify the monitoring process
The status information that one or more access paths in access path obtain.
6. the communication system as described in any one of claims 1 to 2, wherein modifying the monitoring process includes that modification obtains it
The quantity of the access path of status information.
7. the communication system as described in any one of claims 1 to 2, wherein modifying the selection course includes modification from wherein
Quantity of the selection for the access path of the access path of communication session.
8. the communication system as described in any one of claims 1 to 2, wherein the decision information is at least partly from the state
It is exported in information.
9. the communication system as described in any one of claims 1 to 2, wherein the decision information includes numerical value.
10. communication system as claimed in claim 9, wherein the numerical value includes the value of one or more decision parameters.
11. communication system as claimed in claim 10, wherein the modification process include by with the decision parameters wherein
One of associated parameter value and corresponding threshold value comparison.
12. communication system as claimed in claim 9, wherein the numerical value includes the change rate of one or more decision parameters
Value.
13. communication system as claimed in claim 12, wherein the modification process include by with the decision parameters wherein
One of associated rate of change value and corresponding threshold value comparison.
14. a kind of control is via one group of first access path of the first access technology and one group of second access of the second access technology
The communication system (10) in path to network access method, second access technology be different from first access technology,
The method includes
It is obtained according to monitoring process and is accessed with one or more access paths and described second in first access path
The relevant status information of state of one or more access paths in path,
It is selected from first and second access path according to selection course and according to the status information for communication session
Access path, and
One of the monitoring process and described selection course or two are modified according to modification process and according to decision information
Person is to optimize the balance between benefit provided by cost caused by the monitoring process and the selection course, wherein described
Modification process comprises determining whether the one or more service requests for meeting the communication session.
15. a kind of control is via one group of first access path of the first access technology and one group of second access of the second access technology
The communication system (10) in path to network access device, second access technology be different from first access technology,
Described device includes
For being obtained according to monitoring process and one or more access paths and described second in first access path
The component of the relevant status information of state of one or more access paths in access path,
For being selected from first and second access path for communicating according to selection course and according to the status information
The component of the access path of session, and
For modifying one of the monitoring process and described selection course according to modification process and according to decision information
Or both to optimize provided by cost caused by the monitoring process and the selection course portion of the balance between benefit
Part, wherein the modification process comprises determining whether the one or more service requests for meeting the communication session.
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| CN108965066B (en) * | 2018-10-17 | 2020-06-05 | 网宿科技股份有限公司 | Method and device for detecting transmission path |
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| CN1503592A (en) * | 2002-11-26 | 2004-06-09 | �ձ�������ʽ���� | Double-mode mobile communication equipment and method for selecting network |
| CN1505910A (en) * | 2001-04-10 | 2004-06-16 | ����ɭ�绰�ɷ�����˾ | Commanding handover between differing radio access technologies |
| CN1589048A (en) * | 2004-09-13 | 2005-03-02 | 于耕 | Multisystem multichannel radio communication device and radio communication method using said device |
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| CN1505910A (en) * | 2001-04-10 | 2004-06-16 | ����ɭ�绰�ɷ�����˾ | Commanding handover between differing radio access technologies |
| CN1503592A (en) * | 2002-11-26 | 2004-06-09 | �ձ�������ʽ���� | Double-mode mobile communication equipment and method for selecting network |
| CN1589048A (en) * | 2004-09-13 | 2005-03-02 | 于耕 | Multisystem multichannel radio communication device and radio communication method using said device |
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