EP2055132A1 - Ergänzung der nachbarzelllisten eines mobilfunkkommunikationssystems durch auslastungs-informationen - Google Patents
Ergänzung der nachbarzelllisten eines mobilfunkkommunikationssystems durch auslastungs-informationenInfo
- Publication number
- EP2055132A1 EP2055132A1 EP07802667A EP07802667A EP2055132A1 EP 2055132 A1 EP2055132 A1 EP 2055132A1 EP 07802667 A EP07802667 A EP 07802667A EP 07802667 A EP07802667 A EP 07802667A EP 2055132 A1 EP2055132 A1 EP 2055132A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- list
- network
- information
- radio
- radio station
- 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- Withdrawn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
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
Definitions
- the invention relates to a method for operating a radio communication system, in which a network-side radio station transmits to subscriber stations radio station information concerning other network-side radio stations.
- messages such as voice information, picture information, video information, short message service (SMS), multimedia messaging service (MMS) or other data are transmitted by electromagnetic waves over a radio interface between the transmitting and receiving stations.
- the stations may be different subscriber stations or network-based radio stations such as repeaters, radio access points or base stations depending on the specific embodiment of the radio communication system.
- Mobile radio communication system is at least a part of the subscriber stations to mobile radio stations.
- the radiation of the electromagnetic waves takes place with carrier frequencies which lie in the frequency band provided for the respective system.
- WLAN Wireless Local Area Network
- Wipralocal wireless local area networks
- WLANs Wireless Local Area Networks
- Examples of different standards for WLANs are HiperLAN, DECT, IEEE 802.11, Bluetooth and WATM.
- Transmission medium is regulated in radio communication systems by multiple access methods (Multiplex Access, MA).
- Multiple accesses the transmission medium in the time domain (TDMA), in the frequency domain (Frequency Division Multiple Access, FDMA), in the code area (Code Division Multiple Access, CDMA) or in space (Space Division Multiple Access, SDMA) between be divided the subscriber stations.
- TDMA time domain
- FDMA frequency domain
- CDMA code Division Multiple Access
- SDMA Space Division Multiple Access
- multicarrier In order to achieve the most efficient transmission of data, it is possible to divide the entire available frequency band into several subbands (multicarrier or multicarrier method).
- the idea underlying multicarrier systems is to convert the initial problem of transmitting a wideband signal into the transmission of several narrowband signals.
- An example of a multicarrier transmission method is OFDM (Orthogonal Frequency Division Multiplexing), in which temporally approximately rectangular pulse shapes are used for the subbands.
- radio communication systems comprise a plurality of network-side radio stations. While a subscriber station is associated with a particular network radio station, is it makes sense that the subscriber station already performs measurements on signals of other network radio stations. Results of these measurements can be used, for example, in the case of a change of the subscriber station to another network-end radio station, referred to as UMTS, depending on the current operating state of the subscriber station as handover or cell reselection. The subscriber stations are usually informed by their current network radio station about which other network radio stations measurements are to be made.
- the invention has for its object to provide an efficient method for operating a radio communication system, in which a network-side radio station to subscriber stations radio station information concerning other network-side radio stations emits. Furthermore, a network-side radio station and a subscriber station for performing the method will be presented.
- a first network-side radio station transmits radio station information relating to other network-side radio stations, measurements of signals of signals from network-side radio stations displayed by the radio station information being to be carried out by the subscriber stations.
- the first network-side radio station further transmits utilization information concerning the utilization of at least some of the network-side radio stations indicated by the radio station information.
- the radio station information is used to inform the subscriber stations regarding other network radio stations.
- the radio station information may contain, for example, identification information of the other network radio stations, and optionally an indication of radio resources which are used to broadcast the signals to be measured by the subscriber stations.
- the measurements of the subscriber stations are preferably carried out on signals which are specifically or at least intended inter alia for carrying out the measurements, for example on broadcast signals.
- the radio station information may implicitly or explicitly request the subscriber stations to perform the measurements.
- An implicit request is preferably made by including the radio station information in a message of a particular type of message, where the subscriber stations know that measurements are to be made with respect to network radio stations indicated in that message type.
- Radio station information is thus at least inter alia with the aim of prompting the subscriber stations to carry out measurements.
- Load information sent from the first network radio station relates to the utilization of some or all of the network radio stations of the radio station information.
- the utilization can be measured or determined in different ways.
- the current utilization of a network-side radio station indicates whether a change of a subscriber station to the respective network-side radio station would currently be possible. This can e.g. based on the currently unoccupied radio resources, which the respective network-side
- Radio station are available to be measured. If a network-end radio station supplies several radio cells, the load may be on one, several or all radio cells Respectively; the use of a separate utilization size for each of the several radio cells is possible.
- Subscriber stations determined measurement results in deciding which network-side radio station should be made a change makes it possible to select a network-side radio station with the best possible radio channels to the respective subscriber station as a new network-side radio station.
- the decision can be made by the subscriber station or on the network side, preferably by the first network-side radio station or the other network-side radio station involved in the exchange.
- the subscriber stations are to carry out measurements on signals of network-side radio stations displayed by the radio station information as a function of the utilization information.
- the load information may implicitly or explicitly prompt the subscriber stations to take into account the load information when making the measurements.
- An implicit request is preferably made by the fact that the utilization information is contained in a message of a certain type of message, wherein the subscriber stations knows how to take into account the received utilization information due to the receipt of a message of the particular type.
- the emission of the utilization information is thus at least inter alia with the aim of informing the subscriber stations that the utilization information should be taken into account when carrying out the measurements are.
- the utilization information may indicate whether measurements are to be made with respect to the respective network-side radio station indicated by the radio station information.
- the radio station information includes, for example, the indication of three network radio stations, while the load information indicates a load of one of these three network radio stations, a subscriber station is aware of whether or not measurements are to be performed, at least with respect to this one network radio station ,
- the utilization information and the radio station information can be sent out in a common message. Alternatively, it is possible to send out the utilization information and the radio station information in mutually different messages. The latter makes it possible to emit the load information more frequently than the radio station information when the load information and the radio station information are broadcasting repeatedly. This is an advantage if the load information changes faster than the radio station information.
- a different frequency broadcast subscriber stations can be up to date with respect to both information, without having to send both information in case of a change of only one of the information.
- the content of the utilization information and / or the radio station information may change in order to keep the recipients up-to-date.
- the load information with respect to a network radio station indicates congestion using a binary size. This corresponds in particular to the possibility of indicating "not overloaded” and "overloaded". For example, if the load information includes loads from three network radio stations, then for each of the three network-side radio stations, the value of the binary size specified.
- the advantage of using a binary size is that only a small amount of radio resources has to be used to transmit the utilization information.
- the following procedure is advantageous: measurements of signals of network-side radio stations indicated by the radio station information are to be carried out by the subscriber stations in dependence on the utilization information such that the measurements are not overloaded according to the utilization information network-side radio stations are limited. This means that a subscriber station evaluates the load information to determine which network radio stations are overloaded, with no measurements related to the congested network side
- Radio stations are to be performed, but only in relation to the non-congested network radio stations. As a result, the measurement effort of the subscriber stations is reduced.
- the first network-side radio station receives information regarding the load directly from at least some of the other network-side radio stations.
- This is particularly suitable for a radio communication system in which direct connections exist between network radio stations. These connections can be used for the exchange of load sizes, whereby a network radio station can communicate its current load to some or all other network radio stations.
- the utilization information relates to the utilization of each of the network radio stations indicated by the radio station information.
- the utilization information By evaluating the utilization information can thus be obtained for each network-side radio station, which is included in the radio station information, a statement regarding their utilization. It is advantageous for the utilization information to indicate the utilization of network-side radio stations which are only indicated by the radio station information and which have a certain utilization. This allows transmission resource-saving transmission of the utilization information. Depending on the design of the utilization information, it is thereby possible to inform about all or only some of the network-side radio stations displayed by the radio station information with respect to their utilization.
- the utilization information only includes utilization information which is changed compared to the last emission of utilization information. This also results in transmission resource-saving transmission of utilization information.
- the radio station information is a neighbor cell list.
- the neighboring cell list specifies other network-side radio stations or their radio cells, which are located in the vicinity of the first network-side radio station, so that a change of a subscriber station from the first network-side radio station to a network radio station of the neighboring cell list is possible.
- the network-side radio station has means for transmitting radio station information
- Subscriber stations relating to other network radio stations to be carried out by the subscriber stations measurements on signals displayed by the radio station information network-side radio stations, as well as means for broadcasting utilization information
- the subscriber station comprises means for receiving radio station information transmitted by a first network-side radio station concerning other network-side radio stations, and means for receiving utilization information transmitted by the first network-side radio station concerning the utilization of at least some of the network-side information displayed by the radio station information Radio stations, and means for making measurements based on the reception of the radio station information to signals of network-side radio stations indicated by the radio station information in dependence on the utilization information.
- the network-side radio station according to the invention and the subscriber station according to the invention are particularly suitable for carrying out the method according to the invention, and this can also apply to the refinements and developments. For this they may include other suitable means.
- Figure 1 a section of a
- FIG. 2 a neighboring cell list
- FIG. 3A shows a neighboring cell list extended by utilization information
- FIG. 3B a first list of utilization information
- FIG. 3C a second list of utilization information.
- the detail of a mobile radio communication system shown in FIG. 1 comprises the radio cell C1 The network-side radio station NodeB 1, and the radio cell C2 of the network-side radio station NodeB 2.
- the network-side radio stations NodeB 1 and NodeB 2 communicate in their respective radio cell Cl or C2 with subscriber stations, such as those located in the radio cell Cl
- the subscriber station UE is connected via a radio interface to the network-end radio station NodeB 1, via which a communication of the subscriber station UE with other subscriber stations of the same or another radio communication system, as well as with other systems such. the internet, is possible.
- the network radio stations NodeB 1 and NodeB 2 are interconnected via the interface X2. Via the interface X2, the network radio stations NodeB 1 and NodeB 2 can be used directly, i. without use of a central
- the considered mobile radio communication system is a system according to a 3G LTE (3rd Generation Long Term Evolution) standard; However, the invention is also applicable to other systems.
- 3G LTE 3rd Generation Long Term Evolution
- the network radio station NodeB 1 sends to the
- the neighbor cell list N-LIST indicates to the subscriber station UE that the radio cells C2, C3, C4, C5 and C6 are located in the vicinity of the radio cell C1 of the network radio station NodeB 1.
- the neighboring cell list contains N-LIST suitable, the network-side radio station NodeB 1 and the User station UE known identification information of the radio cells C2, C3, C4, C5 and C6.
- the neighbor cell list N-LIST may contain further information, such as time offsets or references.
- the broadcast of neighboring cell lists takes place in the form of so-called cell information lists on the BCCH (Broadcast Control Channel) in the SIB (System Information Block) 11/12.
- BCCH Broadcast Control Channel
- SIB System Information Block
- RAT Radio Access Technology
- the transmission of the neighbor cell list N-LIST serves the purpose of informing the subscriber station UE with respect to which radio cells measurements are to be performed.
- the measurements of the user station UE are used in the decision about a reassignment of the user station UE to a network radio station. Measured values on signals of other network-end radio stations can thus be determined by the subscriber station UE and transmitted to the network side, i. to the current network-side radio station, to be prompted there after the evaluation, if necessary, a change.
- the user station UE can autonomously initiate a change on the basis of these measured values.
- a change from the network-side radio station NodeB 1 is preferably carried out to a network-side radio station, in relation to which it is known on the basis of the measurements of the subscriber station UE that a good radio connection to the Subscriber station UE is present. If the subscriber station UE communicates with the network-end radio station NodeB 1 at the time of the change, the change is a handover. On the other hand, if it does not communicate and is in an operating state designated as idle mode in UMTS, the change in UMTS is referred to as cell reselection.
- Radio station performs this radio cell and turns out in an attempt to change the subscriber station UE in this cell, that the change can not be completed successfully because the radio cell is currently overloaded.
- This unsuccessful cell change has the disadvantage that the user station UE has carried out the corresponding measurement in vain, for which time and Batte ⁇ e essence had to be spent. This is all the more serious the more entries the neighbor cell list contains, and the more measurements the subscriber station UE has to perform accordingly.
- the neighboring cell list can currently contain up to 96 radio cells. A complete measurement of all these radio cells, a subscriber station is heavily stressed, so that superfluous measurements should be avoided.
- the network-end radio station NodeB 1 sends the subscriber station UE information about the utilization of the neighboring radio cells.
- This information transmission can be configured in various ways, as will be explained below with reference to FIGS. 3A, 3B and 3C.
- the display of the utilization of a radio cell is binary, i. A subscriber station is informed whether a radio cell is overloaded or whether it is not overloaded.
- a value of 0 in terms of utilization indicates that the respective radio cell is overloaded, whereas a value of 1 indicates that the respective radio cell is overloaded
- Radio cell is not overloaded.
- the utilization information thus indicates whether a change to a radio cell is possible or not if the utilization of the candidate radio cell was used as the sole criterion.
- the user station UE uses the utilization information by performing measurements only with respect to those radio cells which are not overloaded. As a result, the quality of taking place taking into account the measurements change is not reduced, because a change to an overloaded radio cell would not have been possible anyway.
- the utilization information can, as shown in FIG. 3A, be contained in the neighboring cell list N-LIST.
- the neighbor cell list is added to each cell
- N-LIST supplements whether there is currently an overload, corresponding to the value 0, or no overload, corresponding to the value 1.
- the subscriber station UE can be the neighbor cell list N-LIST of Figure 3A thus deduce that the adjacent radio cells C2, C3, C4, C5 and C6 are present, the radio cells C4 and C6 are overloaded, while the radio cells C2, C3 and C5 are not overloaded.
- FIG. 3A it is not necessary to use a separate message for sending the utilization information. Rather, the neighboring cell list N-LIST is used for this purpose.
- FIG. 3B shows the case that a separate list A-LIST is used for the transmission of the utilization information, which is not integrated into the neighboring cell list N-LIST as in the case of FIG. 3A.
- the load list A-LIST contains the same number of entries as the neighbor cell list N-LIST. Therefore, a simple assignment between the entries of the load list A-LIST and the neighbor cell list N-LIST take place: the first entry of the load list A-LIST refers to the first radio cell of the neighbor cell list N-LIST, the second entry of the load list A-LIST relates on the second radio cell of the neighboring cell list N-LIST, etc.
- the subscriber station UE is to be informed of the current utilization for each radio cell of the neighboring cell list, as is the case in FIGS. 3A and 3B, then it is not necessary to specify either the value 1 or the value 0 for each radio cell. Rather, the specification of 1 or no value or 0 or no value would be sufficient.
- the list of FIG. 3A would be reduced to the statements C2: 1, C3: 1, C4, C5: 1, C6.
- the information is used as to which radio cell the value 1 refers to.
- the use of a separate message for the load list A-LIST has the advantage that the frequency of the emission of the load list A-LIST is not due to the frequency the radiation of the neighboring cell list N-LIST is coupled. It is to be expected that the information of the load list A-LIST will change faster than those of the neighbor cell list N-LIST. Therefore, it is advantageous to broadcast the load list A-LIST more often than the neighbor cell list N-LIST.
- a change list A-LIST is sent, as shown in FIG. 3C.
- the last posted load list A-LIST contained the information from FIG. 3B.
- the duty cycle changes from 1 to 0, i. from not overloaded to overloaded, and with respect to the radio cell C4, the duty cycle from 0 to 1, i. from overloaded to not overloaded, while the utilization of the other radio cells C3, C5 and C6 remains the same or approximately the same, it is sufficient to only communicate the changed utilization information to the following broadcast of the load list A-LIST.
- the same radio channel must be used for the utilization information as for the neighboring cell list N-LIST, ie a broadcast channel, intended for all subscriber stations.
- a separate message containing separate messages from the neighboring cell list N-LIST is used for the utilization information
- the utilization list A-LIST can be broadcast on the broadcast channel, as can the neighbor cell list N-LIST, or via dedicated channels assigned to individual subscriber stations Radio channels.
- SIB system information block
- an extension of an existing SIB for the utilization information can be used.
- the network-side radio station NodeB 1 the information about whether another cell is currently busy, preferably provided directly from the respective network-side radio station, with respect to the network-side radio station NodeB 2 via the interface X2. However, if the neighboring cell list of the network-end radio station NodeB 1 contains radio cells of network-side radio stations to which the network-end radio station NodeB 1 has no direct connection, the relevant information of the network radio station NodeB 1 can be from another
- the UMTS RNC Radio Network Controller
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006038583A DE102006038583A1 (de) | 2006-08-17 | 2006-08-17 | Ergänzung der Nachbarzelllisten eines Mobilfunkkommunikationssystems durch Auslastungs-Informationen |
PCT/EP2007/058537 WO2008020060A1 (de) | 2006-08-17 | 2007-08-16 | Ergänzung der nachbarzelllisten eines mobilfunkkommunikationssystems durch auslastungs-informationen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2055132A1 true EP2055132A1 (de) | 2009-05-06 |
Family
ID=38740170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07802667A Withdrawn EP2055132A1 (de) | 2006-08-17 | 2007-08-16 | Ergänzung der nachbarzelllisten eines mobilfunkkommunikationssystems durch auslastungs-informationen |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110076957A1 (de) |
EP (1) | EP2055132A1 (de) |
CN (1) | CN101523958A (de) |
DE (1) | DE102006038583A1 (de) |
WO (1) | WO2008020060A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2665455T3 (es) * | 2008-04-28 | 2018-04-25 | Nokia Technologies Oy | Método y dispositivo para re-selección de célula inter-frecuencia o inter-RAT |
CN104105111B (zh) * | 2013-04-02 | 2017-11-21 | 电信科学技术研究院 | 一种激活时刻的计算方法及装置 |
US9854591B2 (en) * | 2015-04-09 | 2017-12-26 | Intel IP Corporation | Device, system and method of cell specific probability load balancing |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1037489A3 (de) * | 1999-03-18 | 2001-08-29 | Siemens Aktiengesellschaft | Verfahren zum Informieren von Mobilteilnehmerstationen über aktuell verfügbare Übertragungsressourcen |
WO2003069940A1 (de) * | 2002-02-18 | 2003-08-21 | Siemens Aktiengesellschaft | Verfahren zur funkzellenauswahl |
GB2385745B (en) * | 2002-02-21 | 2004-06-09 | Motorola Inc | A method and apparatus for selecting carriers |
US7447506B1 (en) * | 2002-03-29 | 2008-11-04 | Good Technology, Inc. | Apparatus and method for reducing network congestion |
KR20060097720A (ko) * | 2003-09-30 | 2006-09-14 | 텔레폰악티에볼라겟엘엠에릭슨(펍) | 고속 무선 패킷 데이터 네트워크 내의 혼잡 제어용 방법 및장치 |
US7751367B2 (en) * | 2003-12-11 | 2010-07-06 | Qualcomm, Inc. | Conveying sector load information to mobile stations |
-
2006
- 2006-08-17 DE DE102006038583A patent/DE102006038583A1/de not_active Withdrawn
-
2007
- 2007-08-16 EP EP07802667A patent/EP2055132A1/de not_active Withdrawn
- 2007-08-16 WO PCT/EP2007/058537 patent/WO2008020060A1/de active Application Filing
- 2007-08-16 US US12/310,208 patent/US20110076957A1/en not_active Abandoned
- 2007-08-16 CN CNA2007800379340A patent/CN101523958A/zh active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO2008020060A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20110076957A1 (en) | 2011-03-31 |
CN101523958A (zh) | 2009-09-02 |
DE102006038583A1 (de) | 2008-02-21 |
WO2008020060A1 (de) | 2008-02-21 |
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