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WO2013010565A1 - Élément de réseau et procédé de fonctionnement associé - Google Patents

Élément de réseau et procédé de fonctionnement associé Download PDF

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Publication number
WO2013010565A1
WO2013010565A1 PCT/EP2011/062109 EP2011062109W WO2013010565A1 WO 2013010565 A1 WO2013010565 A1 WO 2013010565A1 EP 2011062109 W EP2011062109 W EP 2011062109W WO 2013010565 A1 WO2013010565 A1 WO 2013010565A1
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WIPO (PCT)
Prior art keywords
threshold
communication
value
indicative
information element
Prior art date
Application number
PCT/EP2011/062109
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English (en)
Inventor
Bernhard Wegmann
Ingo Viering
Ahmad AWADA
Original Assignee
Nokia Siemens Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/EP2011/062109 priority Critical patent/WO2013010565A1/fr
Publication of WO2013010565A1 publication Critical patent/WO2013010565A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters

Definitions

  • the present invention relates to a network element and a user equipment of a communication network, in particular a radio or mobile communication network.
  • the invention further relates to a method of determining a threshold in a communication network and a method of operating the communication network.
  • the invention relates to a protocol usable for performing
  • SON self optimizing networks
  • MRO mobility robustness optimization
  • dual threshold measurement events consisting of two dedicated thresholds which have to be fulfilled are a main target.
  • Such a dual threshold if for instance used for inter-RAT mobility (event B2 in LTE or 3A in UMTS), i.e. handover between different radio access technologies (RATs).
  • RATs radio access technologies
  • intra-RAT mobility triggered by dual threshold measurement events e.g. A5 in LTE
  • the target of MRO is to optimize those network configuration parameters (e.g. handover (HO) trigger parameters, HO thresholds or timers) such that radio link failures (RLF) due to handover are reduced.
  • network configuration parameters e.g. handover (HO) trigger parameters, HO thresholds or timers
  • RLF radio link failures
  • PM performance management
  • Inter-RAT trigger event B2 is a
  • Inter-RAT neighbor becomes better than B2 t hreshoi d 2-
  • the corresponding inter-RAT measurement event on UMTS side triggering an inter-RAT HO is called 3A.
  • the MRO algorithm basically consists of a root cause analysis phase where cell or cell-pair specific KPI statistics are generated and a correction phase where values of the inter-RAT HO trigger parameters are adjusted.
  • the HO problems normally result from bad timing, i.e. the handovers are either initiated too early or too late.
  • two thresholds have to be simultaneously fulfilled.
  • B2 t hreshoi d ⁇ B2-1
  • Ms own serving cell
  • B2 t hreshoid 2 (B2-2) is compared against the signal strength/quality of a neighboring cell of different RAT (Mn) and the handover is triggered if Ms ⁇ B2-1 AND Mn > B2-2.
  • the neighboring communication link becomes worse than a threshold related to the serving signal and at the same time the signal strength of a neighboring communication link becomes better than a second threshold related to the neighbor signal, i.e. both criteria are fulfilled.
  • the neighboring communication link may be a communication link connecting or belonging to a neighboring cell in a cellular network and/or a communication link which may relate to another mobile standard.
  • the measurement event B2 is typically not reported immediately but after a certain time interval TTT (time to trigger) where both conditions have to be fulfilled in order to make the decision more reliable.
  • TTT time to trigger
  • a timer is started (with a set time value) known as the time to trigger. This timer is used to check that, during this time, the two conditions are still met, thus ensuring that a handover decision is correct and can proceed and avoiding a ping pong effect.
  • RLFs radio link failures
  • the reason for a too late HO can either be a too low threshold B2-1 or a too high threshold B2-2.
  • Fig. 3 shows this case for a too low B2-1 .
  • Fig. 3A shows the signal strength of a communication signal over time for three communication links 301 , 302 and 303, wherein the graph corresponding to the first communication link 301 represents the serving communication path
  • the second graph 302 represents the signal strength for the same user equipment but for a neighboring cell (Mn).
  • the third graph 303 represents a further channel or communication link provided by the serving cell or base station of the service cell. The further or alternative channel may relate to a different mobile standard, for example.
  • the serving cell related threshold B2-1 and the neighbor cell related threshold B2-2 are indicated by the dotted lines 304 and 305, respectively.
  • a rhomb 306 is used to indicate the point in time at which the time to trigger (TTT) period, which is schematically indicated by arrow 307, would run out after reaching the condition B2, i.e. Mn is higher than the threshold B2-2 and Ms is lower than the threshold B2-1 .
  • the UE is getting out-of-sync when signal quality (SINR) falls below a certain threshold Q ou t-
  • SINR signal quality
  • Fig. 3B shows the SINR level 310 of the serving communication link and the SINR level 31 1 of the neighboring communication link.
  • RLF radio link failure
  • Fig. 3C schematically illustrates the reconnection to a different RAT2 after losing the connection with RATI , which serves the communication during the beginning of the shown time period.
  • RAT2 serves the communication during the end of the shown time period, i.e. after the reconnection.
  • a period 320 is schematically indicated which is needed to recover the
  • RLF radio link failure
  • Fig. 3 shows a RLF due to a too low B2-1 .
  • the RLF occurs before B2-1 has been fulfilled.
  • the signal of the neighboring cell Mn is above threshold B2-2 already for a long time and therefore the missing B2 trigger event results obviously from too low B2-1 .
  • the reason for a too late inter-RAT HO could be also a too high B2-2, i.e. the second threshold was not fulfilled, while Ms has already exceeded B2-1 threshold.
  • the threshold B2-1 has to be increased.
  • SON algorithms are based on KPI statistics and do not react
  • a network element a user equipment, a method of determining a threshold in a communication network, a method of operating the communication network, a protocol usable for performing communication in a communication network, a program element, and a computer readable medium according to the independent claims. Further embodiments are described in the dependent claims.
  • a network element for a communication network comprising a receiving unit and a processing unit, wherein the receiving unit is adapted to receive a data signal including an information element indicative of a determined value of a parameter wherein the value of the parameter is indicative for a gradient of the signal strength of a communication signal in the communication network. Furthermore, the processing unit is adapted to determine a threshold or threshold value based on the received information element.
  • the processing unit may be adapted to determine the threshold or threshold value based directly on the information element.
  • the processing unit may be adapted to calculate or estimate a new threshold value or threshold level from the information element.
  • the processing unit may be adapted to determine the threshold or threshold value in an indirect way, e.g. by using a counter for each specific information element and in case the a specific counter reaches or exceeds a specific number an event may be triggered which calculates, determines, defines or establish a new threshold or threshold value.
  • the term "determine a threshold or threshold value” may particularly denote that a value or data is determined which may be the threshold value itself or which may be used to afterwards determine or establish a threshold or threshold value, e.g. by using the information element to determine specific KPIs which may be fed to a MRO algorithm leading finally to an adaptation of the corresponding threshold.
  • the term “determine” includes direct determining as well as indirect determining.
  • the network element may be a base station, a NodeB, an enhanced NodeB, a relay node, a pico station or the like.
  • the information element may be a time stamp indicative for a point in time at which a
  • the network element may optionally be adapted to send a request message for requesting the data signal including the information element.
  • the processing unit may also be adapted to evaluate whether a predetermined criterion is fulfilled based on and/or with respect to the information element.
  • the information element may be forwarded by another network element, base station, relay node or a user equipment.
  • the information element may be a result of a root cause analysis, may correspond to a directly measured value or may correspond to a pre-processed directly measured value, or the like.
  • the root cause analysis process may be one established in the network, e.g. according to a specific standard.
  • the threshold value may be associated with a handover procedure in the communication network.
  • the threshold value may correspond to a serving related threshold value, wherein a handover may be initiated in case the measured signal strength of a communication signal to and/or from a serving base station falls below the serving related threshold value.
  • the threshold value may correspond to a threshold value related to another serving, e.g. serving cell or serving channel, wherein a handover may only be initiated in case a measured signal strength of a communication signal to and/or from a neighbouring base station exceeds another respective threshold value.
  • a user equipment for a communication network comprising a determining unit and a sending unit, wherein the determining unit is adapted to determine a value of a parameter wherein the value of the parameter is indicative for a gradient of a signal strength of a communication signal in the communication network.
  • the sending unit is adapted to send a data signal including an information element indicative of the determined value of the parameter.
  • the gradient may be indicative for a temporally and/or locally development of the signal strength of a communication signal transmitted in the communication network.
  • the signal strength itself or a parameter which is indicative of the signal strength may be measured over time and/or versus location or position, e.g. by a measuring unit of the user equipment.
  • the signal of which the signal strength is measured may be a specific data portion or data block of a data signal specifically designed to be indicative of the signal strength and/or performance of the respective communication link the signal is transmitted, e.g. a pilot signal and/or a reference signal.
  • the signal may relate to payload data.
  • the user equipment may be adapted to receive a request message relating to the information or requesting for sending the sent information.
  • the user equipment may receive the request message from a network element, e.g. base station, NodeB, enhanced NodeB, a relay node or the like.
  • the user equipment may respond to this request message by sending the requested information, e.g. a time stamp, indicative for a time period between the reaching of a threshold value or threshold level and an occurred RLF.
  • the user equipment may as well be adapted to send the data signal including the
  • a communication network e.g. a radio communication network or mobile communication network which comprises a network element according to an exemplary aspect and a user equipment according to an exemplary aspect.
  • a method of determining a threshold in a communication network comprises receiving a data signal including an information element indicative of a determined value of a parameter wherein the value of the parameter is indicative for a gradient of a signal strength of a communication signal in the communication network, and determining a threshold or threshold value based on the received information element.
  • the determining of the threshold may directly be based on the information element or may be indirectly based on the information element as described above.
  • a method of controlling a communication in a communication network comprises determining a value of a parameter wherein the value of the parameter is indicative for a gradient of a signal strength of a communication signal in the communication network, and sending a data signal including an information element indicative of the determined value of the parameter.
  • a communication protocol for a communication network is provided, wherein the communication protocol is adapted to support a message format including an information element indicative of a determined value of a parameter wherein the value of the parameter is indicative for a gradient of a signal strength of a communication signal in the communication network.
  • a user equipment and/or a network element may be adapted to implement the communication protocol.
  • One adaptation of the UE may be that it can provide a time interval measurement and/or that it is configured to receive and send standardized signaling messages to carry out these measurements.
  • a program element is provided, which, when being executed by a processor, is adapted to control or carry out a method according to an exemplary aspect of the invention.
  • a computer-readable medium in which a computer program is stored which, when being executed by a processor, is adapted to control or carry out a method according to an exemplary aspect of the invention.
  • a gist of an exemplary aspect may be seen in providing information elements which are indicative of a gradient of a signal strength of a communication signal in the communication network.
  • a gradient may relate to a temporally and/or locally development of the signal strength. Therefore, the temporally development of a signal strength may be taken into account, for example, when adjusting threshold levels in a communication network.
  • such gradients may provide additional information compared to the measured signal strengths of communication signals which may be useful for increasing the performance of a communication network, e.g. reducing radio link failures. Due to this additional information an adjusting of the thresholds may be improved or simplified.
  • the signal strength of one signal e.g. the signal relating to the serving communication link or channel
  • the other signal e.g. the signal relating to a neighboring communication link
  • known methods depending on the signal strength only may decide that the threshold which has been less exceeded (i.e. signal with small gradient) is responsible for the failure and, therefore, leads to wrong direct or indirect determination of the threshold, e.g. by inducing wrong KPI counts which may finally lead to wrong threshold modifications.
  • the embodiments also apply to the user equipment, the method of determining a threshold value in a communication network, the method of operating the communication network, the protocol usable for performing communication in a communication network, the program element, and the computer readable medium.
  • the determination of the threshold or threshold value is based on the received information element and a further received information element.
  • the received information element e.g. a first information element and the further received information element, e.g. a second information element, may be received from a user equipment of the communication network.
  • the information elements may be included or may be part of the same data signal received by the network element or may be part of different data signals.
  • the first information element may relate to a first communication link while the second information may relate to a second communication link.
  • the received information element relates to a first communication link of the communication network and the further received information element relates to a second communication link of the communication network.
  • the first communication link and the second communication link may relate to communication links between the user equipment and different serving base stations, relay nodes or the like, e.g. relate to different cells of a cellular communication network.
  • both communication links may relate to a communication between the user equipment and only one base station, relay node or the like (i.e. the same cell), but the communication links may relate to different standards, e.g. UMTS, LTE, GSM or the like.
  • the two communication links may provide alternative communication paths for the user equipment.
  • the determination of the threshold comprises performing a root cause analysis and generating a value for a specific Key Performance Indicator based on the received information element.
  • the root cause analysis may be an MRO root cause analysis.
  • the information element may be used to refine the MRO root cause analysis by generating or modifying a specific KPI value.
  • the network element may be adapted to adapt or modify the threshold or threshold value based on a reached specific KPI value.
  • a root cause analysis may include or may result in determining specific KPIs.
  • the MRO algorithm may adapt the specific threshold in order to reduce the probability of a handover failure or radio link failure.
  • the generated Key Performance Indicator value is indicative for one of the thresholds of a dual threshold measurement event.
  • the root cause analysis is a part of an MRO algorithm.
  • the network element is adapted to exchange information to determine a network element responsible for the failure and is further adapted to determine a corresponding Key Performance Indicator (KPI).
  • KPI Key Performance Indicator
  • the network element may optionally be adapted to decide which threshold of a plurality of thresholds is modified, wherein the deciding may be based or may depend on a statistical analysis of the Key Performance Indicator values or Key Performance Indicator.
  • the network element may be adapted to exchange information with other network elements, e.g. base stations, in the communication network, which exchanged information may then be used to determine the network element responsible for the failure.
  • other network elements e.g. base stations
  • the MRO algorithm may be adapted to perform the decision which threshold is modified.
  • the network element is further adapted to decide which threshold of a plurality of threshold is determined.
  • the determination may include the decision which of several thresholds is modified or changed in order to achieve a more stable
  • one or more threshold value(s) may be adapted or modified based on the information element indicative of a gradient of a signal strength.
  • the use of a gradient of a signal strength e.g. a temporally development of a signal strength, may be advantageous compared to the use of the sole or pure signal strengths itself.
  • the network element may be adapted to transmit the determined threshold value to a user equipment.
  • the network element may optionally be adapted to transmit a request message to the user equipment.
  • the embodiments also apply to the network element, the method of determining a threshold value in a communication network, the method of operating the communication network, the protocol usable for performing communication in a communication network, the program element, and the computer readable medium.
  • the user equipment further comprises a processing unit, wherein the processing unit is adapted to evaluate whether a predetermined criterion for the determined parameter is fulfilled.
  • a first predetermined criterion may indicate or may relate to the question whether a measured value equals and/or exceeds a corresponding predetermined threshold.
  • a second predetermined criterion may indicate or may relate to the question whether a measured value equals or is lower than a corresponding threshold.
  • the processing unit may be adapted in such a way that it determines or evaluates whether the measured signal value is equal or higher than an upper predetermined threshold in which case a first predetermined criterion may be considered to be fulfilled.
  • the processing unit may be adapted in such a way that it determines or evaluates whether another measured signal value is equal or lower than a lower predetermined threshold, in which case a second predetermined criterion may be considered to be fulfilled.
  • the processing unit may be adapted to perform a processing of the measured value.
  • the processing unit may be adapted to calculate a time difference or time period between a first point in time and a second point in time.
  • the user equipment e.g. the processing unit, may comprise a modulation unit and/or scheduler adapted to include the information element into the data signal to be sent by the user equipment.
  • the information element included in the data signal may be a time stamp or a
  • the determining unit and the processing unit may be formed by a single processor, CPU or computer or may be formed by separate elements or units.
  • the determined parameter is time.
  • the determined parameter may be a time period between a point in time at which the signal strength fulfils a predetermined criterion, e.g. reaches a threshold value, and a further, e.g. subsequent, point in time at which a radio link failure (RLF) occurs. That is, the parameter may be associated with a time period.
  • signal strength of a communication signal or on a communication link may be measured over time, i.e. an n-tuple or matrix including signal strengths and the corresponding times may be measured or determined.
  • the measured parameter may be already the measured time of the RLF and/or the point in time at which the predetermined criterion may be fulfilled the first or the last time, e.g. the predetermined threshold is reached.
  • the predetermined criterion may relate to the reaching of a predetermined threshold and may be, in the case of a lower threshold or limit, relate to the point in time at which the signal strength falls below the predetermined lower threshold. In case of an upper threshold the criterion may relate to the point in time at which the signal strength exceeds the predetermined upper threshold.
  • the term "reaching” may denote the point in time at which the signal strength is equal or substantially equal to the predetermined threshold. In particular, it may depend on the application and/or the threshold whether the predetermined threshold is reached when the measured value reaches the predetermined threshold from below (exceeding the threshold), e.g. an upper limit, or reaches a predetermined threshold from above (falling below), e.g. a lower limit.
  • the information element is a time stamp.
  • the sent information element may be a time stamp corresponding or being indicative for the point in time when the predetermined criterion is fulfilled.
  • the information element may relate or indicate the point in time at which a predetermined criterion is fulfilled, e.g. a signal strength of a communication signal exceeds or falls below an upper threshold and/or a lower threshold.
  • the time stamp may relate to the point in time at which a measured signal strength reaches, e.g. from above or below, a threshold the last time before a radio link failure occurs.
  • the time stamp may already be indicative of a time interval or time period between a point in time a threshold is reached and a subsequent radio link failure.
  • Such a time stamp may be indicative of a temporally development of a signal strength, i.e. a temporally gradient.
  • this time period may be indicative of the speed of changing of the signal strength, because it may be assumed that the signal strength changes faster or steeper in case the time period between reaching the threshold and occurring of the RLF is shorter.
  • the information element is a time stamp indicative for a time period between the point in time at which the signal strength reaches a predetermined threshold value and the occurrence of a radio link failure.
  • the method of determining a threshold further comprises receiving a further information element which is a further time stamp indicative for a further time period between the point in time at which a signal strength reaches a further predetermined threshold value and the occurrence of the radio link failure.
  • the further time period or second time period may relate or may be associated with the signal strength of another signal reaches a further threshold level.
  • the time period (first time period) may relate to a first communication link while the further or second time period may relate to another communication link of the same user equipment.
  • the first time period or time interval and the second time period or time interval may be associated with different thresholds, e.g. one may be an upper threshold and one may be a lower threshold.
  • the further or second information element may be part of the same data signal or may be included in the same data signal.
  • the method of determining a threshold further comprises determining which of the predetermined threshold and the further predetermined threshold is modified based on a comparison of the time stamp and the further time stamp.
  • a misconfigured threshold of a plurality of thresholds may be determined based on the comparison of the time stamp and the further time stamp.
  • Such a misconfigured threshold may cause problems, e.g. causing RLFs, and may be modified or adapted after it is detected.
  • the smaller time stamp i.e. the time stamp indicating the shorter time period
  • the predetermined threshold may be modified which corresponds to the smaller time stamp.
  • the time stamp is used to indirectly determine the specific threshold, e.g. by using the time stamps or a corresponding KPI value or statistic during a MRO algorithm.
  • the time stamp may be used to indirectly determine the specific threshold, e.g. by using the time stamps or a corresponding KPI value or statistic during a MRO algorithm.
  • the lower threshold i.e. the threshold belonging or to be considered to the signal of the serving communication link, indicates a smaller time period, the lower threshold is increased. While in case the time stamp
  • the threshold belonging to the upper threshold i.e. the threshold belonging to the upper threshold
  • the method further comprises generating a specific KPI indicating the adaptation of the specific threshold and incrementing its corresponding counter for statistical analysis.
  • an idea of an exemplary specific embodiment may be seen in providing a mechanism for determining or modifying threshold levels, directly or indirectly, for a handover in a mobile or radio communication network.
  • the mechanism takes into account the gradient of the signal change.
  • a problematic threshold potentially causing the problem is determined by the comparison of a first time interval or time period ⁇ and a second time interval ⁇ 2.
  • the first time interval ⁇ may correspond to a time interval passed between the point in time at which the signal level of the serving communication link reaches (e.g. falling below) the lower threshold T B 2-i and the time of occurrence of the RLF TRLF-
  • the second time interval ⁇ 2 may correspond to a time interval passed between the point in time at which the signal level of the neighboring
  • the UE may measure the following two time intervals:
  • the critical threshold is detected by the shorter time interval. Therefore a potential algorithm for determining which threshold should be adapted may be described by the following pseudocode:
  • this approach or algorithm may not fail or at least may be less prone to failure if two measured signals, i.e. the signal strength of the serving link (Ms) and the signal strength of the neighboring link (Mn), change with different gradients, i.e. if for instance the signal strength of one signal (e.g. Ms) drops quite fast while the other signal (Mn) is slightly above the threshold since rather long time.
  • a method according to an exemplary embodiment may be part of the MRO SON feature and may require specific measurement configuration messages to the UE.
  • Fig. 1 schematically shows a temporally course of signal strengths.
  • Fig. 2 schematically shows another temporally course of signal strengths.
  • Fig. 3 schematically shows another temporally course of signal strengths.
  • Fig. 4 schematically shows a communication network in which a network element according to an exemplary embodiment can be used.
  • Fig. 5 schematically shows a network element according to an exemplary embodiment.
  • Fig. 6 schematically shows a user equipment according to an exemplary embodiment. Detailed Description
  • Fig. 1 schematically and exemplarily for the inter-RAT situation depicts time intervals which may have to be measured or determined by a user equipment in order to enable a threshold adjusting mechanism according to an exemplary embodiment.
  • Fig. 1 A shows the signal strength of a communication signal over time for three communication links 101 , 102 and 103, wherein the graph corresponding to the first communication link 101 represents the serving communication path (Ms), i.e. the communication link used for transmitting payload data.
  • the second graph 102 represents the signal strength for the same user equipment but for a neighboring cell (Mn).
  • the third graph 103 represents a further channel or communication link provided by the serving cell or base station of the service cell. The further or alternative channel may relate to a different mobile standard, for example.
  • the serving cell related threshold B2-1 and the neighbor cell related threshold B2-2 are indicated by the dotted lines 104 and 105, respectively.
  • a rhomb 106 is used to indicate the point in time at which the time to trigger (TTT) period, which is schematically indicated by arrow 107, would run out after reaching the condition B2, i.e. that Mn is higher than the threshold B2-2 and Ms is lower than the threshold B2-1 .
  • an arrow 108 is shown in Fig. 1 A corresponding to a time interval or time period At 2 corresponding to the time period between the point in time the signal Mn exceeds the threshold B2-2 and the occurrence of the radio link failure.
  • Arrow 109 corresponds to a time interval or time period A corresponding to the time period between the point in time the signal Ms exceeds the threshold B2-2 and the occurrence of a RLF. It should be noted that the time periods or time intervals A and At 2 may
  • Radio link Failure typically happens when signal quality (SINR) falls below a certain threshold Q ou t- This is schematically depicted in Fig. 1 B showing the SINR level 1 10 of the serving communication link and the SINR level 1 1 1 of the neighboring communication link. Additionally, the point in time of a radio link failure is indicated by rhomb 1 12 in Fig. 1 B which RLP occurred some time (t Qou t) after the SINR fell below threshold Q ou t which is indicated by the arrow 1 13.
  • Fig. 1 C schematically illustrates reconnection to a different RAT2 after losing the connection with RATI , which serves the communication during the beginning of the shown time period.
  • RAT2 serves the communication during the end of the shown time period, i.e. after the reconnection.
  • a period 120 is schematically indicated which is needed to recover the
  • RLF radio link failure
  • a key feature of an exemplary embodiment may be that the UE measures the time between fulfilling trigger conditions such as B2 condition 1 or 2 (or A5 condition 1 or 2), and an occurring RLF. This can be done via time stamps, or via directly measuring At. Furthermore, the UE may report this information element to a network element of a communication network, e.g. a base station BS. For instance, it can attach this info to the RLF report which already has been specified in 3GPP Release 9/10.
  • the critical threshold may be detected by the shorter time interval of ⁇ and ⁇ 2 . Therefore a potential algorithm for determining which threshold should be adapted may be written in pseudocode as following:
  • This approach may require slightly more complexity in terms of time stamp measurement on UE side, but may be more efficient in terms of determining the appropriate threshold (B2-2 or B2-1 ) which should be modified in order to reduce the probability of a too late handover.
  • a pure level based approach without this time information may make a wrong decision and mislead the MRO algorithm.
  • a scenario in which a pure level based approach may lead to wrong decisions is schematically depicted in Fig. 2 which is in principle the same as the one shown in Fig. 1 .
  • FIG. 2A shows the signal strength of a communication signal over time for three communication links 201 , 202 and 203, wherein the graph
  • corresponding to the first communication link 201 represents the serving
  • the second graph 202 represents the signal strength for the same user equipment but for a neighboring cell (Mn).
  • the third graph 203 represents a further channel or communication link provided by the serving cell or base station of the service cell.
  • the further or alternative channel may relate to a different mobile standard, for example.
  • the serving cell related threshold B2-1 and the neighbor cell related threshold B2-2 are indicated by the dotted lines 204 and 205, respectively.
  • a rhomb 206 is used to indicate the point in time at which the time to trigger (TTT) period, which is schematically indicated by arrow 207, would run out after reaching the condition B2, i.e. that Mn is higher than the threshold B2-2 and Ms is lower than the threshold B2-1 .
  • a determined difference (Mn - B2-2) between the measured signal strength Mn and the threshold B2-2 is indicated by arrow 208.
  • a determined difference (B2-1 - Ms) between the measured signal strength Ms and the threshold B2-1 is indicated by arrow 209.
  • B2-1 - Ms > Mn - B2-2.
  • Radio link Failure typically happens when signal quality (SINR) falls below a certain threshold Q ou t-
  • SINR signal quality
  • Fig. 2B shows the SINR level 210 of the serving communication link and the SINR level 21 1 of the neighboring communication link.
  • the point in time of a radio link failure is indicated by rhomb 212 in Fig. 2B which RLP occurred some time (t Qou t) after the SINR fell below threshold Q ou t which is indicated by the arrow 213.
  • Fig. 2C schematically illustrates the reconnection to a different RAT2 after losing the connection with RATI , which serves the communication during the beginning of the shown time period.
  • RAT2 serves the communication during the end of the shown time period, i.e. after the reconnection. Between the two periods a period 220 is schematically indicated which is needed to recover the
  • RLF radio link failure
  • the thresholds are known (provided by measurements configuration messages) and the current signal measurements (Ms and Mn) when RLF occurred are provided to UE with the RLF report.
  • this pure level base approach fails if the two measured signals change with different gradients, i.e. if for instance the signal strength of one signal (e.g. Ms) drops quite fast while the other signal (Mn) is slightly above the threshold since rather long time (see Fig. 2).
  • the algorithm would propose to decrease threshold B2-2 even though that criterion was fulfilled already all the time. Lowering the B2-2 would not change the situation for this problem case. In contrast, it would probably lead to too early HO problem in other areas of the corresponding cell.
  • a gradient of the measured signal strengths Ms and Mn may be taken into account when deciding which threshold is changed. In particular, the decision may be based only indirectly on the measured signal strengths, e.g. by using the signal strengths and
  • a user equipment e.g. a mobile phone
  • the trigger condition which is associated with the shorter time interval may then be adjusted, either by increasing or decreasing the appropriate threshold. In this way a future too late or too early handover may be avoidable.
  • Fig. 4 schematically shows a communication network or communication system
  • Fig. 4 shows four network elements, e.g. base stations 401 , 402, 403, and 404. Additionally, five user equipments 405, 406, 407, 408, and 409 are schematically depicted in Fig. 4. Furthermore, two serving cells 410 and 41 1 are indicated by the respective dotted lines.
  • 401 to 404 may be adapted to perform a method of determining a threshold in a communication network according to an exemplary embodiment
  • the user equipments 405, 406, 407, 408, and 409 may be adapted to perform a method of controlling a communication in a communication network according to an exemplary embodiment
  • the user equipments may be adapted to perform a measurement or determination of a value of a parameter wherein the value of the parameter is indicative for a gradient of a signal strength of a communication signal in the communication network.
  • the two user equipments 408 and 409 may be in the coverage of both of the cells 410 and 41 1 .
  • the performing of method of controlling communication in a communication network with respect to one of these two user equipments may be advantageous.
  • Fig. 5 schematically shows a network element 500 according to an exemplary embodiment.
  • the network element may be a base station, a relay node, a pico station or the like.
  • the network element comprises a receiving unit
  • the receiving unit is adapted to receive a data signal including an information element indicative of a determined value of a parameter wherein the value of the parameter is indicative for a gradient of a signal strength of a communication signal in the communication network.
  • Fig. 6 schematically shows a user equipment 600, e.g. a mobile phone, a PDA, a laptop or the like, according to an exemplary embodiment.
  • the user equipment 600 for a communication network comprises a determining unit 601 , and a sending unit 602, e.g. an antenna.
  • the determining unit is adapted to determine or measuring a value of a parameter wherein the value of the parameter is indicative for a gradient of a signal strength of a communication signal in the communication network.
  • the sending unit is adapted to send a data signal including an information element indicative of the determined value of the parameter.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un élément de réseau pour un réseau de communication, l'élément de réseau comprenant une unité de réception et une unité de traitement, l'unité de réception étant conçue pour recevoir un signal de données qui comprend un élément d'information indicatif d'une valeur déterminée d'un paramètre, la valeur du paramètre étant indicative pour un gradient d'une intensité de signal d'un signal de communication dans le réseau de communication. En outre, l'unité de traitement est conçue pour déterminer une valeur seuil en fonction de l'élément d'information reçu.
PCT/EP2011/062109 2011-07-15 2011-07-15 Élément de réseau et procédé de fonctionnement associé WO2013010565A1 (fr)

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WO2015094084A1 (fr) * 2013-12-16 2015-06-25 Telefonaktiebolaget L M Ericsson (Publ) Événements de défaillance de la liaison radio
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WO2017003338A1 (fr) * 2015-07-02 2017-01-05 Telefonaktiebolaget Lm Ericsson (Publ) Information d'un équipement utilisateur en ce qui concerne son entrée dans une zone géographique ayant une condition radio médiocre
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WO2015044931A1 (fr) * 2013-09-30 2015-04-02 Telefonaktiebolaget L M Ericsson (Publ) Amélioration d'un rapport de défaillance de liaison radio pour enregistrer des détails de synchronisation nécessaires pour un événement déclencheur de transfert intercellulaire à seuil double
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