EP2263408A1 - Transmission resource management - Google Patents
Transmission resource managementInfo
- Publication number
- EP2263408A1 EP2263408A1 EP09721154A EP09721154A EP2263408A1 EP 2263408 A1 EP2263408 A1 EP 2263408A1 EP 09721154 A EP09721154 A EP 09721154A EP 09721154 A EP09721154 A EP 09721154A EP 2263408 A1 EP2263408 A1 EP 2263408A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- terminal
- value
- mobility
- terminals
- transmission
- 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- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
-
- 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
Definitions
- the present invention relates to radio transmission in communication networks, and more particularly to the management of radio transmission resources in such networks.
- the transmission resources are radio channels. These transmission resources are allocated to the different terminals that wish to transmit data. At a given moment, a plurality of terminals can share a same radio channel which is then divided into a time slot or frequency.
- a network entity such as for example a base station, is in charge of deciding on the scheduling of the traffic on this shared radio channel. For this purpose, when several terminals are able to transmit data on the same radio channel, it selects, at a given time, a terminal to allow access to the transmission resource. This selection of a terminal can be made on the basis of different types of features.
- US 6,449,490 discloses such a terminal selection method which aims to maximize the amount of data transmitted by all terminals wishing to transmit data, while ensuring a certain level of equity between the different terminals.
- the base station allocates a transmission resource to the terminal with which the highest value is associated.
- a traffic scheduling management method makes it possible to obtain efficient transmission resource management when the terminals are relatively non-mobile. However, it can be inefficient within a set of terminals whose respective movements are not homogeneous. Indeed, in this case, the average transmission conditions of a highly mobile terminal can be very misleading on the current transmission conditions of the terminal. Under such conditions, it is possible to allocate a transmission resource to a terminal which was previously in good transmission conditions but which is in poor transmission conditions at the time of allocation of the transmission resource. This results in a management of transmission resources that may be inefficient.
- a first aspect of the present invention provides a method of managing transmission resources in a communication network comprising a management entity adapted to allocate a transmission resource to a terminal among a plurality of terminals; said method comprising the following steps at the management entity level:
- IBI select a terminal from the plurality of terminals on the basis of a characteristic relating to an instant transmission condition of the terminal and a characteristic relating to an average transmission condition of the terminal, taking into account the mobility value which it is associated;
- the allocation of a transmission resource is advantageously performed by taking into account the degree of mobility of the terminals, which makes it possible not to apply selection criteria. similar to a highly mobile terminal and a low mobile terminal at the time of allocation of the transmission resource.
- This feature makes it possible in particular to avoid allocating a transmission resource to a terminal that is in poor radio conditions at the time of allocation.
- a very mobile terminal that is, moving at a relatively high speed, may be subject to rapid changes in the transmission conditions in which it is located.
- the characteristic relating to a terminal transmission condition may not be representative of the transmission condition in which find the terminal when the resource is allocated.
- the mobility values associated with the terminals it is possible to favor a selection rather based on a characteristic relating to an instantaneous transmission condition for the terminals with which relatively high mobility values are associated, ie high mobility, and a selection rather based on a characteristic relating to an average transmission condition for terminals with which relatively low mobility values are associated.
- a mobility value to be associated with a terminal is determined by taking into account at least one of a first value indicating a cell change frequency and a second value indicative of a change frequency. modulation and coding for the terminal during a given period of time.
- the value 0 may represent the null mobility of a terminal for which the cell changeover frequency and / or the modulation and coding changeover frequency for the terminal during a given period of time is zero; and the value 1 can represent the maximum mobility of a terminal for which the frequency of change of cell and / or the frequency of modulation change and coding for the terminal during a given period of time is high.
- a selection value r ⁇ ij (t) is determined for each terminal i of the plurality of terminals according to the following equation:
- n (t) is an instantaneous transmission rate value of the terminal i
- Rj (t) is a mean transmission rate value realized by the terminal i over a given period of time
- ⁇ ⁇ ( i ) is a parameter which varies inversely with the mobility value k (i) associated with the terminal i, when the mobility value increases with the mobility of a terminal.
- the management entity then selects the terminal with which the highest selection value is associated.
- the characteristic relating to the instantaneous transmission condition of the terminal is its instantaneous transmission rate, and that relating to the average transmission condition is its average transmitted transmission rate.
- the selection value is a combination of the instantaneous transmission rate and the average transmission rate in which the average transmission rate is more or less represented as a function of the value of the parameter ⁇ k (j) which is itself function of terminal mobility. More precisely, since the value of ⁇ 1 ) varies in the opposite direction of the terminal mobility value, the selection value thus determined for a very mobile terminal represents relatively little the characteristic of average transmission condition with respect to the instantaneous transmission condition characteristic, while the selection value determined for a stationary terminal relatively strongly represents the average transmission condition characteristic with respect to the instantaneous transmission condition characteristic.
- the parameter cik ( ⁇ ) can be a fixed value per cell.
- Such a network configuration is advantageous when the mobility of the terminals in a cell is homogeneous, such as on a motorway section for example, or on a pedestrian zone. By doing so, it simplifies the implementation of a management method according to one embodiment.
- each mobility class corresponding to a plurality of successive mobility values.
- Successive sets of successive mobility values k (i) then represent respective mobility classes, and the parameter ⁇ ⁇ ) can then be a fixed value per mobility class. If the mobility values are between 0 and 1, then ten mobility classes can be provided, the first corresponding to values between 0 and 0.1, and so on up to the tenth mobility class that corresponds to the mobility values. between 0.9 and 1.
- Such an embodiment makes it possible to simplify the implementation of a management method according to an embodiment of the present invention, with respect to a configuration in which the parameter ⁇ k (1) varies with each value different from k ( i).
- the plurality of terminals considered here, comprise terminals having required transmission resources at the communication network level and can be updated before each step / a /.
- a second aspect of the present invention provides a radio resource management entity adapted to implement a radio resource management method according to the first aspect of the present invention.
- a third aspect of the present invention provides a base station in a communication network adapted to allocate a transmission resource to one of a plurality of terminals, said base station comprising a transmission resource management entity according to the second aspect. of the present invention.
- a fourth aspect of the present invention provides a network controller in a communication network adapted to allocate a transmission resource to one of a plurality of terminals, said network controller including a transmission resource management entity according to the second aspect. of the present invention.
- a fifth aspect of the present invention provides a computer program for installation in a resource management entity according to the second aspect of the present invention, including instructions for carrying out the method according to the first aspect of the present invention. invention, during execution of the program by processing means of the management entity.
- Fig. 1 illustrates a communication network according to an embodiment of the present invention
- Figure 2 illustrates the main steps of a management method according to an embodiment of the present invention
- Figure 3 illustrates a transmission resource management entity architecture according to an embodiment of the present invention
- Fig. 1 illustrates a communication network according to an embodiment of the present invention.
- This communication network comprises a management entity 11 which is in charge of scheduling the data transmissions of a plurality of terminals 12 to 14.
- This communication network 10 may be a mobile communication network in which all the terminals are mobile terminals. But no limitation is attached to the type of terminal whose transmissions can be managed by a management entity according to an embodiment of the present invention.
- the transmission resources of the communication network 10 can be used both by mobile terminals and fixed terminals.
- the management entity 11 is then in charge of scheduling the use of the transmission resources between the terminals that can be mobile or fixed.
- the management entity 11 manages the scheduling of the traffic within a plurality of terminals to successively allow the terminals to access the transmission resources of the communication network 10.
- this management entity 11 may be located at one of the network entities provided in such an architecture, for example at the base stations of this network. , or at the level of the network controllers (or RNC for 'Radio Network Controller' according to the terminology of the UMTS standard).
- this management entity January 1 is disposed elsewhere in the network, this management entity can be dedicated to the allocation of transmission resources. In this case, provision should be made for communication between a network entity that receives the transmission requests from the terminals and this management entity, since the latter entity determines among the plurality of terminals that wish to transmit data at a time t that is authorized to transmit.
- FIG. 2 illustrates the main steps of a management method according to an embodiment of the present invention, at the level of the management entity 11.
- This management entity 11 is in charge of assigning a transmission resource, here for example a time slot, to one of a plurality of terminals wishing to transmit data at a time t in the same cell.
- a transmission resource here for example a time slot
- this management entity knows the plurality of terminals that wish to transmit data, that is to say the set of terminals that have data waiting to be transmitted in the cell in question.
- the management entity associates a mobility value with each of the terminals that wish to transmit data.
- This mobility value k (i) is representative of a mobility level for the terminal i with which it is associated. It can be predicted that a mobility value is between 0 and 1, and that a mobility value equal to zero is assigned to a terminal that is fixed and a value close to the value 1 to a terminal that has a level. high mobility.
- the mobility of a terminal in the network may result in a cell change of the terminal (or 'handover' in English). Indeed, when a terminal that is managed in a cell, thus located in the geographical coverage area of this cell, moves to the coverage area of another cell, it can then be supported in this other cell. cell.
- a cell change for a mobile terminal ensures a radio coverage despite the movement of the terminal in the network. It should be noted that the more mobile a terminal is, that is, the larger its movements, the more likely it is that its cell switching frequency will be high.
- the transmission conditions relating to the radio channel on which the terminal transmits may vary.
- the transmission conditions can sometimes be improved by changing the modulation and coding for the transmission under consideration.
- the transmission conditions can be acceptable with a certain modulation and a certain coding, and then, especially if the terminal is moving, it is possible that, to maintain good transmission conditions, the application of another modulation and another coding is required.
- the frequency of the modulation and coding change associated with a transmission of a terminal can also be used to determine a mobility value to be associated with the terminal in question.
- a mobility value can advantageously be determined as a function of the frequency of cell change that the terminal has undergone lately, for example over a determined period of time, and / or as a function of the modulation change and coding frequency to which the transmission of the terminal in question has been subjected, for example over a determined period of time.
- the two characteristics relating to the transmission of a terminal can therefore advantageously be taken into account in the determination of a mobility value of a terminal in a cellular mobile network of the GSM type (for 'Global System for Mobile Communications') or UMTS (Universal Mobile Telecommunications System) for example.
- GSM Global System for Mobile Communications
- UMTS Universal Mobile Telecommunications System
- the management entity 11 is then able, in a step 22, to select a terminal to allocate the next transmission resource.
- a selection algorithm or scheduling algorithm based on a selection value ⁇ i
- a selection value can verify the following equation:
- r, (t) is an instantaneous transmission rate value of the terminal i at time t
- R, (t) is a mean transmission rate value realized by the terminal i over a given period of time
- ⁇ k ( ⁇ ) is a parameter which varies inversely with the mobility value k (i) associated with the terminal i, when the mobility value increases with the mobility of a terminal.
- the management entity then selects the terminal with which the highest selection value m, (t) is associated.
- I is the plurality of terminals wishing to transmit on the same radio channel at the same time.
- the value of instantaneous transmission rate r, (t) can advantageously be estimated on the basis of quality measurements relating to the radio channel in question.
- the average transmission rate value R, (t) can be determined according to the following equation:
- R 1 (t) (1 - a) R, (t - ⁇ ) + a.d ⁇ t - ⁇ ) (2)
- d, (t - 1) represents the actual transmission rate achieved by the terminal i during the slot of previous time (t-1), this transmission rate being equal to O if this terminal has not been selected during the time slot (t-1); and where a is an adjustment parameter relating to the effective transmission rate of the terminal i, where a is generally set to a low value.
- the same mobility value k (i) for a set of terminals of the plurality of terminals and thus create terminal mobility classes within the plurality of terminals whose traffic is to be scheduled.
- a parameter value ⁇ k ( ⁇ > may then be set per mobility class
- Such a configuration of the parameter value ⁇ ⁇ ( ⁇ ) may be advantageous in a communication network for an urban area, in which the terminals may be animated with very different movements and therefore be associated with different mobility values, since in an urban area the users of the terminals can move on foot, by car or even be stationary.
- the mobility value k (i) represents the mobility class of the terminal i in the cell on which it depends.
- the value k (i) is representative of a type of cell whose terminal i depends.
- This selection value m, (i) depends on the mobility value k (i) associated with the terminal i, since it depends on the value of the parameter ⁇ ⁇ , which is itself a function of the mobility value k ( i). Therefore, the selection step described above is advantageously a function of the mobility value associated with each of said plurality of terminals.
- the management entity decides to allow the selected terminal i to use the transmission resource considered, that is to say the time slot t.
- an update of the plurality of terminals is performed. Indeed, some new terminals may have wished to transmit data and other terminals may no longer wish to do so.
- the management entity 11 can either proceed to step 21 again to associate a mobility value with each of the plurality of terminals wishing to still transmit data, or proceed directly to step 22 by selecting an upcoming terminal i based on the mobility values already associated with terminals waiting for a transmission resource to transmit.
- step 23 It is possible to go from step 23 to step 21, ie to reiterate the determination of the mobility values regularly over time, in order to take into account rapidly any changes in the level of mobility of the mobility. 'a terminal.
- the management entity 11 does not have to select a terminal on the basis of the selection values as defined according to equation (1). , since the transmission resource can then be allocated to this terminal alone the applicant
- the value of a k ⁇ is determined at a value close to 1 for a terminal i which is fixed or almost fixed
- the allocation of the transmission resource is made according to the ratio of the instantaneous transmission rate to the transmission rate achieved, which makes it possible to guarantee a certain balance between the achieved bit rate and equity for relatively fixed terminals.
- the selection value m, (t) essentially represents the instantaneous flow rate of the terminal i , which avoids selecting a terminal that would not be in good radio conditions at the time of allocation of the resource, by applying an embodiment of the present invention
- the average transmission rate achieved by the terminal i, note R, (t) in equation (1) can represent transmission conditions very different from those in which the terminal i is at the present moment.
- FIG. 3 illustrates a transmission resource management entity 1 1 according to one embodiment of the present invention.
- Such a transmission resource management entity 11 comprises, in one embodiment of the present invention, an association entity 31 adapted to associate a mobility value k ( ⁇ ) with each terminal of the plurality of terminals, this mobility value indicating a level of terminal mobility in the communication network It further comprises a selection entity 32 adapted to select a terminal from among the plurality of terminals on the basis of a characteristic relating to an instantaneous transmission condition of the terminal and a characteristic relating to an average transmission condition of the terminal, taking into account the mobility value associated with it.
- It also comprises a decision entity 33 adapted to allocate a transmission resource to the terminal selected by the selection entity 32.
- This transmission resource management entity 11 may further comprise a determination entity 34 adapted to determine a mobility value k (i) to be associated with a terminal by taking into account at least one of a first value indicating a frequency cell change and a second value indicating a modulation change frequency and coding for said terminal for a given period of time.
- the determining entity 34 may further be adapted to determine a selection value m, (t) for each terminal i of the plurality of terminals according to the following equation: where ⁇ (t) is an instantaneous transmission rate value of the terminal i; where Rj (t) is a mean transmission rate value realized by the terminal i over a given period of time; and where ⁇ k (j ) is a parameter which varies inversely with the mobility value k (i) associated with the terminal i, when the mobility value increases with the mobility of a terminal; the management entity selecting the terminal with which the highest selection value is associated.
- Such a management entity may correspond to any network entity of the architecture of the communication network considered, or be an entity dedicated to the allocation of the transmission resource. She is in communication with a network entity that has terminal transmission resource requests.
- Such a management entity can notably be located at a base station, that is to say at a cell of the network, or at a network controller, that is to say say at a higher level in the network architecture.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0851423A FR2928516A1 (en) | 2008-03-05 | 2008-03-05 | TRANSMISSION RESOURCE MANAGEMENT BASED ON MOBILITY OF TERMINALS. |
PCT/FR2009/050192 WO2009112728A1 (en) | 2008-03-05 | 2009-02-06 | Transmission resource management |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2263408A1 true EP2263408A1 (en) | 2010-12-22 |
Family
ID=39731242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09721154A Withdrawn EP2263408A1 (en) | 2008-03-05 | 2009-02-06 | Transmission resource management |
Country Status (5)
Country | Link |
---|---|
US (1) | US8849329B2 (en) |
EP (1) | EP2263408A1 (en) |
CN (1) | CN102017748B (en) |
FR (1) | FR2928516A1 (en) |
WO (1) | WO2009112728A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2642811B1 (en) * | 2012-03-23 | 2014-11-26 | Siemens Aktiengesellschaft | Device and method for fixing a transmission channel of a slave |
CN113556753B (en) * | 2020-04-23 | 2023-11-03 | 大唐移动通信设备有限公司 | User-based service continuous method and system |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
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US5396645A (en) * | 1992-04-09 | 1995-03-07 | Comcast Pcs Communications, Inc. | System and method for determining whether to assign a macrocell or microcell communication frequency to a mobile communication terminal |
US6449490B1 (en) * | 1999-05-24 | 2002-09-10 | Qualcomm Incorporated | Transmitter directed code division multiple access system using path diversity to equitably maximize throughput |
GB2393612B (en) * | 2002-09-27 | 2006-01-18 | Motorola Inc | A resource management apparatus and a method of resource management thereof |
JP2004207839A (en) * | 2002-12-24 | 2004-07-22 | Nec Corp | Wireless resource management system, method thereof, management apparatus used for the same, base station, and terminal |
CN1973497B (en) * | 2004-05-10 | 2011-07-06 | 株式会社Ntt都科摩 | Packet transmission control device and packet transmission control method |
US8238345B2 (en) * | 2005-04-15 | 2012-08-07 | Ntt Docomo, Inc. | Packet transmission control device, and packet transmission control method |
US7796550B2 (en) * | 2005-12-13 | 2010-09-14 | General Instrument Corporation | Method and apparatus for packet scheduling in a wireless network |
JP4818803B2 (en) * | 2006-05-01 | 2011-11-16 | 株式会社エヌ・ティ・ティ・ドコモ | Radio communication method and radio communication apparatus based on variable TTI length control |
CN101019461B (en) * | 2006-05-31 | 2010-10-20 | 华为技术有限公司 | Method and system for wireless network connection |
KR100948797B1 (en) * | 2006-12-11 | 2010-03-24 | 삼성전자주식회사 | Apparatus and method for scheduling in mobile communication system |
KR101428816B1 (en) * | 2007-09-28 | 2014-08-12 | 엘지전자 주식회사 | Method for reselecting a cell and detecting whether a terminal is stationay in mobile telecommunications system |
-
2008
- 2008-03-05 FR FR0851423A patent/FR2928516A1/en not_active Withdrawn
-
2009
- 2009-02-06 CN CN200980116579.5A patent/CN102017748B/en active Active
- 2009-02-06 EP EP09721154A patent/EP2263408A1/en not_active Withdrawn
- 2009-02-06 WO PCT/FR2009/050192 patent/WO2009112728A1/en active Application Filing
- 2009-02-06 US US12/920,172 patent/US8849329B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2009112728A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102017748A (en) | 2011-04-13 |
WO2009112728A1 (en) | 2009-09-17 |
CN102017748B (en) | 2015-04-01 |
US8849329B2 (en) | 2014-09-30 |
FR2928516A1 (en) | 2009-09-11 |
US20110009146A1 (en) | 2011-01-13 |
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