WO2014187480A1 - Améliorations apportées à une liste de cellules voisines - Google Patents

Améliorations apportées à une liste de cellules voisines Download PDF

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Publication number
WO2014187480A1
WO2014187480A1 PCT/EP2013/060491 EP2013060491W WO2014187480A1 WO 2014187480 A1 WO2014187480 A1 WO 2014187480A1 EP 2013060491 W EP2013060491 W EP 2013060491W WO 2014187480 A1 WO2014187480 A1 WO 2014187480A1
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WIPO (PCT)
Prior art keywords
neighbor cell
indication
cell
information
neighbor
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PCT/EP2013/060491
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English (en)
Inventor
Ali YAVER
Hans Thomas Hoehne
Amaanat ALI
Marcin RYBAKOWSKI
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Nokia Solutions And Networks Oy
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Priority to PCT/EP2013/060491 priority Critical patent/WO2014187480A1/fr
Publication of WO2014187480A1 publication Critical patent/WO2014187480A1/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
    • 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
    • H04W36/00835—Determination of neighbour cell lists
    • 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
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to an apparatus, a method, a system, and a computer program product related to radio access technology, in particular to HSPA evolution. More particularly, the present invention relates to an apparatus, a method, a system, and a computer program product for heterogeneous networks. Background of the invention
  • Mobile networks capacity enhancements is one of the key areas in current research driven by increasing data traffic demands. Such capacity enhancements can be fulfilled e.g. by add- ing more spectrum resources into the system (multicarrier for example) or by optimizing existing spectrum usage (e.g. multiflow).
  • One of the proposed solutions to combat increased traffic is the use of so called small cells, also known as Low Power Nodes (LPNs).
  • LPNs Low Power Nodes
  • a deployment of small cells (pico or micro cells) together with macro cells is termed as Heterogeneous Network (HetNet).
  • HetNet Heterogeneous Network
  • small cells are basically low powered NodeBs (1 Watt to 5 Watts of maximum TX power) aimed at serving a specific concentration of data traffic especially in urban environments. Such deployments could be both indoor and outdoor. Indoor deployments are aimed at serving users located in public or private establishments with high traffic demands such as offices, airports, shopping malls etc.
  • 3GPP TS 25.133 defines:
  • a cell shall be considered detectable when
  • a UE may present already a noticable level of interference in UL for an LPN even if the LPN DL power is close to or even below the above mentioned level.
  • Fig. 1 sketches the signal strengths between macro BTS and LPN BTS exemplarily.
  • the path between macro and LPN BTS e.g. pico BTS
  • the received UL/DL signal strength decreases linearly with the distance from the respective base station.
  • linear decrease is only exemplary and not limiting.
  • DL coverage (thick dashed lines) of the macro BTS extends slightly larger than uplink coverage (thin dashed lines), but this is exemplary only, too.
  • DL coverage of the small cell is much less than its UL coverage. No coverage means that the respective received power is below a certain threshold value, as defined e.g. in 3GPP TS 25.133.
  • zone A UL SHO zone
  • downlink of the macro BTS is stronger than downlink of LPN BTS.
  • the UE is served by macro BTS.
  • zone A UL to macro BTS is stronger than UL to LPN BTS, whereas this is different on the right side.
  • the point with equal uplink SINR is marked by "same UL SINR".
  • This zone is also called the SIZ because the UE acts as an interferer to the LPN uplink users.
  • a notable characteristic of the SIZ is also that the LPN cannot reach the interfering UE in the DL and hence cannot control the UL Tx power of the interfering UE.
  • zone B the SINR of the UL to macro BTS becomes very small (below a threshold), but DL of the macro BTS is still higher than that of the LPN BTS.
  • conventional (DL) SHO may take place.
  • This zone is shown extended compared to the conventional DL pilot boundary of the LPN because of application of an, optional, CIO.
  • uplink and downlink of the LPN are stronger than those of the macro BTS.
  • the UE is served by the LPN BTS.
  • Fig. 2 shows a system level simulation performed by Nokia Siemens Networks, which shows a real situation in a typical Hetnet deployment with 4 LPNs dropped per Macro cell with 30 dBm LPNs.
  • 21 macro cells (hence 84 LPNs and a total of 105 transmitting stations in total) were placed according to 3GPP simulation agreements for HetNet system level simulations (R1-125312: TP on Simulation Assumptions for Evaluation of HSPA Heterogeneous Networks).
  • R1-125312 TP on Simulation Assumptions for Evaluation of HSPA Heterogeneous Networks.
  • the CDF of the Ec/lo of the 3 strongest links in the strong UL/DL imbalance zone also known as SIZ according to 3GPP terminology, UL SHO zone, or non AS region
  • Each curve represents a CDF of Ec/lo of a downlink from one of the 105 trans- mitting stations.
  • the solid line curve on the rightmost part of Figure 2 represents the serving cell to a given UE.
  • the curves to the left are the 2 nd and 3 rd strongest DL contributors.
  • NCL provides a means for a UE to look for potential cells to handover to if the signal strength from the current cell drops below an acceptable threshold. Neighbouring cells are defined on a cell-by-cell basis in the radio network configuration database.
  • each cell in the RAN can have an individual set of neighbouring cells.
  • the NCL may be communicated to UEs in UTRAN by means of the commonly known System Information Block (SIBs) which is broadcasted or dedicated to the UE, e.g. by a RRC Measurement Control message.
  • SIBs System Information Block
  • the NBAP system information update procedure is used to indicate to BTS the new information to be broadcasted on the BCCH and to control the state of the cell.
  • Figure 3 shows an example of the former method described in the previous paragraph.
  • RNC sends a system information update request to the NodeB (as an example of a BTS).
  • NodeB sends system information to UE based on the system information update request. This system information is repeatedly sent (continuously scheduled) by the NodeB.
  • the receipt of a system information update by the NodeB is acknowledged by system information update response (or failure).
  • NCL information in the connected mode is contained in the SIB12 information block.
  • the neighbour cell information which is transmitted to the mobile station for the intra-frequency measurements includes the following L3 information elements:
  • Cell Individual Offset is a value, which is added to the measured quantity (CPICH Ec/No) of the neighbouring cell before the UE compares the quantity with the reporting criteria.
  • Primary CPICH Info information element contains the downlink scrambling code of the primary CPICH of the neighbouring cell.
  • Read SFN Indicator information element indicates whether the UE should read the SFN of the neighbouring cell or not.
  • Tx Diversity Indicator information element indicates downlink transmission diversity capability of the Node B that is controlling the neighbouring cell.
  • the neighbour cell information which is transmitted to the mobile station for the inter- frequency measurements includes the following L3 information elements:
  • Frequency Info information element contains the absolute UTRA RF channel number of the Primary CPICH of the inter-frequency neighbour cell.
  • Cell Individual Offset is an offset value, which is added to the measured quantity (CPICH Ec/No) of the neighbouring cell before the UE compares the Ec/No value with the reporting criteria. Conventionally, the value of the information element is always 0 dB.
  • Primary CPICH Info information element contains the downlink scrambling code of the primary CPICH of the neighbouring cell.
  • Read SFN Indicator information element indicates whether the UE should read the SFN of the neighbouring cell or not.
  • Tx Diversity Indicator information element indicates downlink transmission diversity capability of the Node B that is controlling the neighbouring cell.
  • UE mobility classification i.e. a determination of the approximate speed of the UE
  • UE classification is typically based on a number of cell-reselections in idle mode and number of active set updates in the connected mode.
  • an apparatus comprising evaluating means adapted to evaluate an information received from an originating cell device, and applying means adapted to apply the evaluated information in at least one of measuring a radio link parameter of a selected neighbour cell and triggering reporting of a measurement report for the selected neighbor cell to the originating cell device; the information comprises at least one of 1. an indication of a timing offset of a first neighbor cell of the originating cell device;
  • the selected neighbor cell is one of the first to seventh neighbor cells to which the information is related.
  • the information may comprise the indication of the timing offset of the first neighbor cell; the selected neighbor cell may be the first neighbor cell; and the apparatus may be adapted to synchronize with the first neighbor cell based on the timing offset.
  • the information may comprise at least one of the indication of the power class of the second neighbor cell, the indication of the uplink desensitization of the third neighbor cell, the indication of the power of the pilot channel of the fourth neighbor cell and the indication of the compensation factor for the seventh neighbor cell;
  • the selected neighbor cell may be one of the second, third, fourth and seventh neighbor cells to which the information is related; and the apparatus may be adapted to estimate an uplink/downlink imbalance based on the evaluated information.
  • the information may comprise the indication of the power of the pilot channel; the selected neighbor cell may be the fourth neighbor cell; and the apparatus may further comprise detecting means adapted to detect the pilot channel using the indicated power of the pilot channel.
  • the information may comprise the indication of the power class of the second cell and an indication that the second cell is on a different carrier than the originating cell device; and the apparatus may further comprise first control means adapted to control measuring related to the second cell based on the indicated power class and the different carrier.
  • the information may comprise the indication of the time to trigger specific for the fifth neighbor cell; the selected neighbor cell may be the fifth neighbor cell; and the apparatus may comprise checking means adapted to check if a measurement result of a measurement remains in a predefined range for a waiting time; triggering means adapted to trigger an event reporting of the measurement result if the measurement result remains in the predefined range for the waiting time; prohibiting means adapted to prohibit the event reporting of the measurement result if the measurement result does not remain in the predefined range for the waiting time; wherein the waiting time is the time to trigger if the measurement is related to the fifth neighbor cell; and the waiting time is different from the time to trigger if the measurement is related to a cell different from the fifth neighbor cell.
  • the information may comprise at least one of the indication of the handover probability and the indication of the time of stay for the sixth neighbor cell; the selected neighbor cell may be the sixth neighbor cell; and the apparatus may comprise second control means adapted to control a measurement reporting related to the sixth neighbor cell based on the at least one of the handover probability and the time of stay indicated in the information.
  • the second control means may be further adapted to control the measurement reporting based on a mobility classification of the apparatus.
  • the information may comprise the indication of the compensation factor for the seventh neighbor cell; the selected neighbor cell may be the seventh neighbor cell; and the apparatus may further comprise calculating means adapted to calculate a link imbalance based on the compensation factor; and reporting means adapted to report the link imbalance to the originating cell device.
  • the information may be received in a neighbor cell list from the originating cell device.
  • the neighbor cell list may comprise a neighbor cell list of a long term evolution network.
  • an apparatus comprising evaluating processor adapted to evaluate an information received from an originating cell device, and applying processor adapted to apply the evaluated information in at least one of measuring a radio link parameter of a selected neighbour cell and triggering reporting of a measurement report for the selected neighbor cell to the originating cell device; the information comprises at least one of
  • the selected neighbor cell is one of the first to seventh neighbor cells to which the information is related.
  • the information may comprise the indication of the timing offset of the first neighbor cell; the selected neighbor cell may be the first neighbor cell; and the apparatus may be adapted to synchronize with the first neighbor cell based on the timing offset.
  • the information may comprise at least one of the indication of the power class of the second neighbor cell, the indication of the uplink desensitization of the third neighbor cell, the indication of the power of the pilot channel of the fourth neighbor cell and the indication of the compensation factor for the seventh neighbor cell;
  • the selected neighbor cell may be one of the second, third, fourth and seventh neighbor cells to which the information is related; and the apparatus may be adapted to estimate an uplink/downlink imbalance based on the evaluated information.
  • the information may comprise the indication of the power of the pilot channel; the selected neighbor cell may be the fourth neighbor cell; and the apparatus may further comprise detecting processor adapted to detect the pilot channel using the indicated power of the pilot channel.
  • the information may comprise the indication of the power class of the second cell and an indication that the second cell is on a different carrier than the originating cell device; and the apparatus may further comprise first control processor adapted to control measuring related to the second cell based on the indicated power class and the different carrier.
  • the information may comprise the indication of the time to trigger specific for the fifth neighbor cell; the selected neighbor cell may be the fifth neighbor cell; and the apparatus may comprise checking processor adapted to check if a measurement result of a measurement remains in a predefined range for a waiting time; triggering processor adapted to trigger an event reporting of the measurement result if the measurement result remains in the predefined range for the waiting time; prohibiting processor adapted to prohibit the event reporting of the measurement result if the measurement result does not remain in the predefined range for the waiting time; wherein the waiting time is the time to trigger if the meas- urement is related to the fifth neighbor cell; and the waiting time is different from the time to trigger if the measurement is related to a cell different from the fifth neighbor cell.
  • the information may comprise at least one of the indication of the handover probability and the indication of the time of stay for the sixth neighbor cell; the selected neighbor cell may be the sixth neighbor cell; and the apparatus may comprise second control processor adapted to control a measurement reporting related to the sixth neighbor cell based on the at least one of the handover probability and the time of stay indicated in the information.
  • the second control processor may be further adapted to control the measurement reporting based on a mobility classification of the apparatus.
  • the information may comprise the indication of the compensation factor for the seventh neighbor cell; the selected neighbor cell may be the seventh neighbor cell; and the apparatus may further comprise calculating processor adapted to calculate a link imbalance based on the compensation factor; and reporting processor adapted to report the link imbalance to the originating cell device.
  • the information may be received in a neighbor cell list from the originating cell device.
  • the neighbor cell list may comprise a neighbor cell list of a long term evolution network.
  • a user equipment comprising an apparatus according to any of the first and second aspects.
  • an apparatus comprising providing means adapted to provide an information, wherein the information comprises at least one of
  • the information may comprise the indication of the power of the pilot channel of the fourth neighbor cell; and the apparatus may comprise pilot controlling means adapted to control the power of the pilot channel of the fourth neighbor cell according to the indicated power.
  • the information may comprise an indication of a cell individual offset of the fourth neighbor cell; wherein the apparatus may further comprise calculating means adapted to calculate the cell individual offset based on the power of the pilot channel.
  • the information may comprise the indication of the time to trigger specific for the fifth neighbor cell; wherein the apparatus may further comprise determining means adapted to determine the time to trigger based on a size of the fifth neighbor cell.
  • the information may comprise plural indications of respective times to trigger specific for the fifth neighbor cell related to respective mobility classifications of a terminal device; and the determining means may be adapted to determine each of the times to trigger based on the size of the neighbor cell and the respective mobility classification.
  • the information may comprise the indication of the compensation factor for the seventh neighbor cell; and the apparatus may comprise deciding means adapted to decide if a handover to the seventh neighbor cell takes place based on a received link imbalance.
  • the providing means may be adapted to provide the information in a neighbor cell list.
  • the neighbor cell list may comprise a neighbor cell list of a long term evolution network.
  • an apparatus comprising providing processor adapted to provide an information, wherein the information comprises at least one of
  • the information may comprise the indication of the power of the pilot chan- nel of the fourth neighbor cell; and the apparatus may comprise pilot controlling processor adapted to control the power of the pilot channel of the fourth neighbor cell according to the indicated power.
  • the information may comprise an indication of a cell individual offset of the fourth neighbor cell; wherein the apparatus may further comprise calculating processor adapted to calculate the cell individual offset based on the power of the pilot channel.
  • the information may comprise the indication of the time to trigger specific for the fifth neighbor cell; wherein the apparatus may further comprise determining processor adapted to determine the time to trigger based on a size of the fifth neighbor cell.
  • the information may comprise plural indications of respective times to trig- ger specific for the fifth neighbor cell related to respective mobility classifications of a terminal device; and the determining processor may be adapted to determine each of the times to trigger based on the size of the neighbor cell and the respective mobility classification.
  • the information may comprise the indication of the compensation factor for the seventh neighbor cell; and the apparatus may comprise deciding processor adapted to decide if a handover to the seventh neighbor cell takes place based on a received link imbalance.
  • the providing processor may be adapted to provide the information in a neighbor cell list.
  • the neighbor cell list may comprise a neighbor cell list of a long term evolution network.
  • a base station or base station controller comprising an apparatus according to any of the fourth and fifth aspects.
  • a method comprising evaluating an information received from an originating cell device, and applying the evaluated information in at least one of measuring a radio link parameter of a selected neighbour cell and triggering reporting of a measurement report for the selected neighbor cell to the origi- nating cell device; the information comprises at least one of
  • the selected neighbor cell is one of the first to seventh neighbor cells to which the information is related.
  • the information may comprise the indication of the timing offset of the first neighbor cell; the selected neighbor cell may be the first neighbor cell; and the method may further comprise synchronizing with the first neighbor cell based on the timing offset.
  • the information may comprise at least one of the indication of the power class of the second neighbor cell, the indication of the uplink desensitization of the third neighbor cell, the indication of the power of the pilot channel of the fourth neighbor cell and the indication of the compensation factor for the seventh neighbor cell;
  • the selected neighbor cell may be one of the second, third, fourth and seventh neighbor cells to which the information is related; and the method may further comprise estimating an uplink/downlink imbalance based on the evaluated information.
  • the information may comprise the indication of the power of the pilot channel; the selected neighbor cell may be the fourth neighbor cell; and the method may further comprise detecting the pilot channel using the indicated power of the pilot channel.
  • the information may comprise the indication of the power class of the second cell and an indication that the second cell is on a different carrier than the originating cell device; and the method may further comprise controlling measuring related to the second cell based on the indicated power class and the different carrier.
  • the information may comprise the indication of the time to trigger specific for the fifth neighbor cell; the selected neighbor cell may be the fifth neighbor cell; and the meth- od may comprise checking if a measurement result of a measurement remains in a prede- fined range for a waiting time; triggering an event reporting of the measurement result if the measurement result remains in the predefined range for the waiting time; prohibiting the event reporting of the measurement result if the measurement result does not remain in the predefined range for the waiting time; wherein the waiting time is the time to trigger if the measurement is related to the fifth neighbor cell; and the waiting time is different from the time to trigger if the measurement is related to a cell different from the fifth neighbor cell.
  • the information may comprise at least one of the indication of the handover probability and the indication of the time of stay for the sixth neighbor cell; the selected neighbor cell may be the sixth neighbor cell; and the method may comprise controlling a measurement reporting related to the sixth neighbor cell based on the at least one of the handover probability and the time of stay indicated in the information.
  • the controlling may be further adapted to control the measurement reporting based on a mobility classification of an apparatus performing the method.
  • the information may comprise the indication of the compensation factor for the seventh neighbor cell; the selected neighbor cell may be the seventh neighbor cell; and the method may further comprise calculating a link imbalance based on the compensation factor; and reporting the link imbalance to the originating cell device.
  • the information may be received in a neighbor cell list from the originating cell device.
  • the neighbor cell list may comprise a neighbor cell list of a long term evolution network.
  • the information may comprise the indication of the power of the pilot channel of the fourth neighbor cell; and the method may comprise controlling the power of the pilot channel of the fourth neighbor cell according to the indicated power.
  • the information comprises an indication of a cell individual offset of the fourth neighbor cell; wherein the method may further comprise calculating the cell individual offset based on the power of the pilot channel.
  • the information may comprise the indication of the time to trigger specific for the fifth neighbor cell; wherein the method may further comprise determining the time to trigger based on a size of the fifth neighbor cell.
  • the information may comprise plural indications of respective times to trigger specific for the fifth neighbor cell related to respective mobility classifications of a terminal device; and the determining may be adapted to determine each of the times to trigger based on the size of the neighbor cell and the respective mobility classification.
  • the information may comprise the indication of the compensation factor for the seventh neighbor cell; and the method may comprise deciding if a handover to the seventh neighbor cell takes place based on a received link imbalance.
  • the providing may be adapted to provide the information in a neighbor cell list.
  • the neighbor cell list may comprise a neighbor cell list of a long term evolution network.
  • Each of the methods according to the seventh and eighth aspects may be a method of enhancing neighbor cell related information.
  • a computer program product comprising a set of instructions which, when executed on an apparatus, is configured to cause the apparatus to carry out the method according to any one of the seventh and eighth aspects.
  • the computer program product may be embodied as a computer-readable medium or may be directly loadable into the apparatus. According to some embodiments of the invention, at least one of the following advantages may be achieved:
  • - UE can estimate the UL/DL imbalance
  • Fig. 1 sketches UL and DL powers in different zones between a macro BTS and a LPN;
  • Fig. 2 shows a simulation of a cumulative distribution function of three strongest links in the SIZ zone;
  • Fig. 3 shows a principle of NBAP system information update procedure
  • Fig. 4 shows an apparatus according to an embodiment of the invention
  • Fig. 5 shows a method according to an embodiment of the invention
  • Fig. 6 shows an apparatus according to an embodiment of the invention.
  • Fig. 7 shows a method according to an embodiment of the invention.
  • the apparatus is configured to perform the corresponding method, although in some cases only the apparatus or only the method are described.
  • more parameters than according to a conven- tional NCL are sent to a UE.
  • the additional parameters may enable a UE to detect, measure, and report neighbours with improved sensitivity so that the RAN could benefit from this information in advance and potential steps could be taken in advance to circumvent many of the issues related to HetNet deployments.
  • the content of a NCL is specific for the cell providing the NCL. That is, if a cell A is a neighbour of both cells B and C, the content of the neighbour cell list in cell B related to cell A may be different to the content of the neighbour cell list in cell C related to cell A.
  • the enhancements of NCL according to some embodiments of the invention are inter alia applicable to connected mode of transmission in CELL_DCH state.
  • Some embodiments of the invention also aim to simplify UL/DL imbalance estimation at the UE side.
  • one or more of the following information elements are included in the NCL.
  • these additional lEs may be provided for any cell (macro cells and small cells).
  • one or more of these information elements may be provided for an LPN only and not for a macro BTS.
  • the presence or absence of a corresponding IE indicates to the UE whether or not the cell belongs to a LPN.
  • the information elements are as follows: 1 ) LPN's Timing Offset
  • a UE When a UE is provided with a neighbour list, it also receives the timing offset for LPN cells. This allows the UE to speed up synchronization as the step of looking for the primary synchronization channel (PSC) can be skipped or narrowed down.
  • PSC primary synchronization channel
  • the UE uses the SCH's primary synchronisation code to acquire slot synchronisation to a cell. This is typically done with a single matched filter (or any similar device) matched to the primary synchronisation code, which is common to all cells.
  • the slot timing of the cell can be obtained by detecting peaks in the matched filter output.
  • LPN's Power Class By providing the LPN power class (transmit power), the UE can be informed if the target cell within its macro serving cell is a small cell. Such information can be utilized at the UE side to anticipate and estimate a UL/DL imbalance. Providing the power class in inter- frequency scenarios with dedicated deployments is also helpful for UE based cell detection. In an Inter-Frequency scenario, a UE served on one frequency may be required to periodically measure the second carrier using its second receiver chain. If the cell power class is provided through NCL, UE may independently optimize the periodicity and the need for activating its second receiver thus potentially lowering the power consumption.
  • this information can be provided to the UE to estimate UL/DL imbalance.
  • LPN's CPICH power is sent to the UE, it will enable tuning CPICH levels on per cell basis. This enables the LPN to use less power for CPICH, while UEs can still detect CPICH and estimate the UL/DL imbalance. Legacy UEs which cannot evaluate LPN's CPICH power may be affected by a lower CPICH level such that they cannot detect CPICH easily. This adverse effect may be mitigated by using range expansion in the form of Cell Individual Offset (CIO). CIO is provided in the legacy NCL.
  • the additional lEs may be different for intra-frequency NCL and inter- frequency NCL.
  • the list may comprise one or more of timing offset for LPN, LPN power class, LPN's UL desensitization, LPN's CPICH Power.
  • the inter-frequency NCL comprises one or more of timing offset for LPN and LPN power class only.
  • LPN power class in inter-frequency NCL can tell the UEs about the presence of potential small cells on a different carrier while they are in CELL_DCH state through the macro. Assume that an UE is required to measure inter-frequency neighbours in order to offload to a different carrier. In single carrier UEs, this is accomplished using Compressed Mode which is initiated by the network. Dual Carrier capable UEs however do not need compressed mode and can measure a different carrier independently without affecting the transmission from the first carrier.
  • the NCL provides information to the UE regarding the power class of the neighbouring LPNs, UE can control the measurements performed on the second carrier. For example, if there are multiple dedicated carrier LPNs in the vicinity pro- vided by the NCL, UEs can increase the measurement frequency.
  • LPN power class is particular useful because the UE may derive therefrom a density of the LPN distribution.
  • other indicators of a LPN such as specific values of timing offset or uplink desensitization may be used to control measurements performed on the second carrier, instead of or in addition to LPN power class.
  • the UE detects an UL/DL imbalance (e.g. based on one of LPN's CPICH power, LPN's power class, and LPN's UL desenistization) and reports it, it will help RNC in deciding how to tackle the mobility procedure when imbalance is high.
  • RNC can take a decision early compared to later triggers. E.g. it can take the decision to initiate a SCC at event 1A instead of event 1 D.
  • delaying mobility procedure such as SCC into the future makes it more vulnerable to failures in challenging radio environments because serving cell quality may drop quite quickly.
  • UE mobility classification is carried out by UE itself in order to avoid any corresponding additional signalling from the network.
  • one or more of the following lEs are provided in the NCL, which are in particular (but not only) useful for fast UEs:
  • TTT values are not defined to be cell specific but are global parameters. They may have a granularity definition at event level. By adding a cell specific TTT to the NCL, TTT may be optimized separately for small cell and users depending on their mobility state.
  • the TTT value (both the global TTT and the cell specific TTT) is set with the intention that a user should not unnecessarily trigger handovers upon receiving sufficient signal from a new cell while its own serving cell's signal is below a certain threshold.
  • TTT values are set to ensure that false alarms are avoided.
  • TTT can be relaxed (i.e. TTT can be shortened) which leads to faster handover times.
  • TTT is quite large and the source cell quality drops pretty quickly, this may cause handover failures, which can be avoided by cell specific shorter TTT.
  • conventional NCL (reported through SIB 12) includes additionally a new field named e.g. Time_To_T rigger' (or similarly) which would allow the operators to configure and report this value individually in dependence of at least one of different mobility classifications and cell sizes.
  • the new field may be applied in particular in CELL_DCH state.
  • TTT may vary dependent on the cell size.
  • sev- eral TTTs for respective mobility classifications may be indicated to the UE.
  • the UE may select a TTT value dependent on its mobility classification.
  • TTTs may be set globally (i.e. for all cells except for those where a cell specific TTT is set) dependent on the mobility classification. In the context of the present application, dependence on mobility classification is included in the term "cell specific", too, if not other- wise made clear from the context.
  • the cell specific time-to-trigger (TTT) parameter is used for intra frequency measurement events such as event 1A, 1 B, 1 C, 1 D and can be suitably extended to events 1 E and 1 F.
  • TTT time-to-trigger
  • these events are as follows: - event 1 A: A Primary CPICH enters the reporting range; addition of a radio link.
  • a non-active primary CPICH becomes better than an active primary CPICH; replacement of the worst cell in AS.
  • the advantage of a lower TTT is that SCC is initiated faster.
  • the TTT may be adjusted to the cell size of the LPN. A smaller cell would require a lower TTT in case the UE is meant to be offloaded to the LPN.
  • the TTT may be set to larger values.
  • a lower TTT may also be chosen when it is known, for e.g. by SON specific data, that the radio conditions in a given HetNet deployment at particular spots degrades quickly. In such a case, the network may set a lower value of TTT based on cell specific parameterization.
  • the cell specific TTT may not be set for all the cells in the NCL and/or not for all UE mobility classifications. If a cell specific TTT is not indicated for a particular cell and/or a particular mobility classification, the global parameter takes precedence. 6) HOF probability and/or ToS values
  • Dynamic parameters such as Handover Failure Rate and Time of Stay in a cell can also be passed on to a UE through NCL.
  • the UE may appropriately adjust and fine tune its device's performance based on the received parameters.
  • the RAN sends at least one of HOF failure probability and median ToS values for the UE.
  • Median ToS value is just an example of an aggregation value of several ToS values but other aggregations such as mean ToS, maximum ToS, minimum ToS may be used instead or in addition.
  • An UE such as a high speed UE, may take advantage of these parameters e.g. based on its mobility classification and may suitably change its measurement behaviour on the given cells in the NCL.
  • the UE may calculate a bias factor internally and use it in the measurement report equations.
  • the UE may sort the list of cells based on decreasing HOF probability OR may sort the list of cells based on increasing ToS. It may then filter the top cells only, and report events for only those filtered cells.
  • NCL comprises information about a compensation factor to be used by the UE while calculating the UL boosting factor for HS-DPCCH channel.
  • the boosting factor may be reported back to the network as part of the RRC measurement report, e.g. at event 1A. The network may then favourably use this parameter to decide if the HO would succeed into the new cell.
  • the boosting factor is an example of a parameter indicating a link imbalance.
  • the value of the boosting factor may also be used by the network in an RRM algorithm to configure Multiflow for the UE.
  • the Compensation Factor takes into account many or even all UL parameters in macro and small cell which contribute to UL imbalance. The following parameters are most important: RX diversity usage, receiver sensitivity, UL Noise Rise, RX equalization gain. Compensation Factor is calculated in RNC and included in NCL. Based on this information and desensitization parameter in NCL, UE may calculate initial boosting factor for UL channels.
  • a UE may also, based on Compensation Factor and DL Path Loss difference measurement between macro and small cell, calculate UL/DL imbalance and send this information to RNC.
  • RNC based on this knowledge may plan appropriate actions to minimize impact of DL/UL imbalance for improving robustness of channel decoding and HO performance.
  • a UE may receive some of the lEs 2) to 4) and 6) (i.e. LPN's power class, LPN's UL desensi- tization, LPN's CPICH power, HOF probability, and ToS values) for all or for only some of the cells in the NCL. In order to decide if a measurement report to trigger handover should take place, the UE may give different weights to these parameters.
  • LPN's power class may have prevalence over the other parameters such that a high LPN power class is favourably selected.
  • a small UL desensitization may be favourable because the UL/DL imbalance is not too large.
  • this parameter may have prevalence over other parameters.
  • other prevalence rules may be applied.
  • Fig. 4 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a terminal device such as a UE, or an element thereof.
  • Fig. 5 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 4 may perform the method of Fig. 5 but is not limited to this method.
  • the method of Fig. 5 may be performed by the apparatus of Fig. 4 but is not limited to being performed by this apparatus.
  • the apparatus comprises evaluating means 10 and applying means 20.
  • the evaluating means 10 evaluates an information (S10).
  • the information is received from an originating cell device.
  • the originating cell device is typically the cell serving the apparatus.
  • the information is received in a neighbor cell list from the originating cell device.
  • the neighbor cell list may be included in a system information block broadcasted by the originating cell device. However, in some embodiments, the information may be received separately from a neighbor cell list.
  • the information may also be received by dedicated signaling to the apparatus.
  • the information comprises at least one of the following:
  • an indication of a time to trigger specific for a fifth neighbor cell of the originating cell device 13. at least one of an indication of a handover failure probability and an indication of a time of stay for a sixth neighbor cell of the originating cell device;
  • the first to seventh neighbor cells may be different from each other, or some or all of the first to seventh neighbor cells may be the same.
  • the information may comprise the same indications for all neighbor cells, or it may comprise some of the indications for a subset of the neighbor cells only.
  • the respective indications may be specific for the respective neighbor cell.
  • globally valid indications may be received for some of the parameters.
  • cell specific parameters may have prevalence over globally valid parameters.
  • the applying means 20 applies the evaluated information to measuring a radio link parameter of a selected neighbor cell and/or triggering reporting of a measurement report for the selected neighbor cell to the originating cell device.
  • the respective cell is the cell of the first to seventh neighbor cells to which the indicated parameter in the information is related.
  • the measurement report may be based on the measuring of the radio link parameter mentioned hereinabove in this paragraph or may be based on a measuring of a different parameter such as a different radio link parameter.
  • Fig. 6 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a base station device such as a NodeB or eNodeB, or a base station controller such as a RNC, or an element thereof.
  • Fig. 7 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 6 may perform the method of Fig. 7 but is not limited to this method.
  • the method of Fig. 7 may be performed by the apparatus of Fig. 6 but is not limited to being performed by this apparatus.
  • the apparatus comprises providing means 1 10.
  • the providing means 1 10 provides an information (S1 10).
  • the information comprises at least one of
  • the information is provided by broadcasting, e.g. in a neighbor cell list of a system information block.
  • the information may be provided separately from a neighbor cell list.
  • the first to seventh neighbor cells may be different from each other, or some or all of the first to seventh neighbor cells may be the same.
  • the information may comprise the same indications for all neighbor cells, or it may comprise some of the indications for a subset of the neighbor cells only.
  • the respective indications may be specific for the respective neighbor cell.
  • glob- ally valid indications may be provided for some of the parameters.
  • a terminal (device) or a user equipment may be a mobile phone, a smart phone, a PDA, a laptop or any other terminal which may be attached to networks of the respective technologies such as LTE, LTE-A or UMTS.
  • a base station (device) may be any base station (BTS) of the respective technology such as a NodeB, an eNodeB, an access point, etc., irrespective of its coverage area, such as macro cell, pico cell, femto cell.
  • BTS base station
  • NodeB and eNodeB are considered to e equivalent to each other if not otherwise stated or clear from the contect.
  • Embodiments of the invention are explained with special emphasis on LPNs. However, the embodiments may be applied not only to LPNs but to any type of cells including macro cells.
  • the provided/received information may comprise one or more pieces of information related to different meanings. It is independent from the realization. Hence, it may comprise a single value (which may have several meanings, e.g. each bit or byte of the value may be related to a different meaning), plural fields of an array, plural information elements, etc..
  • One infor- mation may be transmitted in one or plural messages.
  • Names of network elements, protocols, and methods are based on current standards. In other versions or other technologies, the names of these network elements and/or protocols and/or methods may be different, as long as they provide a corresponding functionality.
  • exemplary embodiments of the present invention provide, for example a terminal device such as a user equipment, or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product(s).
  • exemplary embodiments of the present invention provide, for example a base station device such as an eNB, or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product(s).
  • exemplary embodiments of the present invention provide, for example a radio network controller such as an RNC, or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program ⁇ ) and forming computer program product(s).
  • a radio network controller such as an RNC
  • a component thereof an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program ⁇ ) and forming computer program product(s).
  • Implementations of any of the above described blocks, apparatuses, systems, techniques or methods include, as non limiting examples, implementations as hardware, software, firm- ware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

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

Abstract

L'invention concerne un appareil comprenant un moyen d'évaluation conçu pour évaluer des informations provenant d'un dispositif cellulaire émetteur et un moyen d'application conçu pour appliquer les informations évaluées lors d'au moins une mesure d'un paramètre de liaison radio d'une cellule voisine sélectionnée et déclencher un rapport de mesure pour la cellule voisine sélectionnée à envoyer au dispositif cellulaire émetteur; les informations comprennent une indication de décalage temporel de la première cellule voisine; et/ou une indication de classe de puissance d'une deuxième cellule voisine; et/ou une indication de désensibilisation en liaison montante d'une troisième cellule voisine; et/ou une indication de puissance d'un canal pilote d'une quatrième cellule voisine; et/ou une indication de temps de déclenchement spécifique pour une cinquième cellule voisine; une indication de probabilité de transfert et/ou une indication de temps d'attente pour une sixième cellule voisine,; et une indication de facteur de compensation pour une septième cellule voisine; et la cellule voisine sélectionnée est l'une des sept cellules voisines à laquelle se rapportent les informations.
PCT/EP2013/060491 2013-05-22 2013-05-22 Améliorations apportées à une liste de cellules voisines WO2014187480A1 (fr)

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EP3574680A4 (fr) * 2017-04-10 2019-12-04 Samsung Electronics Co., Ltd. Procédé et son équipement utilisateur (ue) pour une nouvelle sélection de cellule en mode connecté
CN111278037A (zh) * 2018-12-04 2020-06-12 中国移动通信集团吉林有限公司 小区价值评估方法及装置

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EP3574680A4 (fr) * 2017-04-10 2019-12-04 Samsung Electronics Co., Ltd. Procédé et son équipement utilisateur (ue) pour une nouvelle sélection de cellule en mode connecté
CN111278037A (zh) * 2018-12-04 2020-06-12 中国移动通信集团吉林有限公司 小区价值评估方法及装置
CN111278037B (zh) * 2018-12-04 2022-09-27 中国移动通信集团吉林有限公司 小区价值评估方法及装置

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