WO2012051955A1 - 确定目标小区的方法和设备 - Google Patents
确定目标小区的方法和设备 Download PDFInfo
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- WO2012051955A1 WO2012051955A1 PCT/CN2011/081057 CN2011081057W WO2012051955A1 WO 2012051955 A1 WO2012051955 A1 WO 2012051955A1 CN 2011081057 W CN2011081057 W CN 2011081057W WO 2012051955 A1 WO2012051955 A1 WO 2012051955A1
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- 238000000034 method Methods 0.000 title claims abstract description 82
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Classifications
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- 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
- H04W36/08—Reselecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
-
- 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
- H04W36/00837—Determination of triggering parameters for hand-off
- H04W36/008375—Determination of triggering parameters for hand-off based on historical data
Definitions
- the embodiments of the present invention relate to the field of communications technologies, and in particular, to a method and a device for determining a target cell. Background technique
- a heterogeneous network formed by a macro base station and a low power base station (or a low power node) can be used to enhance hotspots within the coverage of the macro base station.
- Area coverage, indoor blind spot or vulnerability coverage, cell edge coverage of macro base stations, etc. can also improve cell average throughput, cell edge throughput, cell uplink/downlink spectrum utilization, network cost reduction, and operator input (Capital) Expenditure, the following cartridges are called: CAPEX) and so on.
- the low power node itself can act as an independent base station, which means that the cut between low power nodes or between low power nodes and other nodes occurs.
- handover between base stations handover between base stations is much more complicated than handover within a base station, involving a large amount of signaling and participation of multiple network elements.
- the embodiments of the present invention provide a method and a device for determining a target cell, which are used to select a target cell between multiple cells after a large number of low-power nodes are introduced.
- an embodiment of the present invention provides a method for determining a target cell, including: acquiring information of a candidate cell of a mobile terminal;
- the candidate cell is a preferred cell determined according to cell statistics, determining that the candidate cell is a target cell of the mobile terminal;
- the cell statistic information includes: specific information of a cell that has served the mobile terminal, and on the other hand, the embodiment of the present invention further provides a mobile terminal, including:
- An obtaining module configured to acquire information about a candidate cell
- a determining module configured to determine that the candidate cell is a target cell if the candidate cell acquired by the acquiring module is a preferred cell determined according to cell statistics information
- the cell statistic information includes: specific information and a further aspect of a cell that has served the mobile terminal.
- the embodiment of the present invention further provides a network side device, including: An acquiring module, configured to acquire information about candidate cells of the mobile terminal;
- the specific information of the cell served by the mobile terminal and the method and device for determining a target cell obtained by the embodiment of the present invention obtain the information of the candidate cell of the mobile terminal, and determine whether the candidate cell is determined by the mobile terminal according to the cell statistics information.
- a preferred cell if yes, determining that the candidate cell is a target cell of the mobile terminal; wherein the cell statistics information includes specific information of a cell that has served the mobile terminal and the cell in which the mobile terminal has served Specific information.
- the method for determining the target cell according to the cell statistics information effectively avoids the blind handover/reselection of the mobile terminal to any candidate cell, saves network resources, and provides a more stable and reliable service for the user.
- FIG. 1 is a flowchart of a method for determining a target cell according to Embodiment 1 of the present invention
- FIG. 2 is a flowchart of a method for determining a target cell according to Embodiment 2 of the present invention
- FIG. 3 is a flowchart of a method for determining a target cell according to Embodiment 3 of the present invention.
- FIG. 4 is a flowchart of a method for determining a target cell according to Embodiment 4 of the present invention.
- FIG. 5 is a flowchart of a method for determining a target cell according to Embodiment 5 of the present invention.
- FIG. 6 is a schematic structural diagram of a mobile terminal according to Embodiment 6 of the present invention.
- FIG. 7 is a schematic structural diagram of a mobile terminal according to Embodiment 7 of the present invention
- 8 is a schematic structural diagram of a mobile terminal according to Embodiment 8 of the present invention
- FIG. 9 is a schematic structural diagram of a network side device according to Embodiment 9 of the present invention.
- FIG. 10 is a schematic diagram of a second structure of a network side device according to Embodiment 10 of the present invention
- FIG. 11 is a schematic diagram of a third structure of a network side device according to Embodiment 11 of the present invention
- a fourth structural schematic diagram of the network side device is a schematic diagram of a second structure of a network side device according to Embodiment 10 of the present invention.
- FIG. 1 is a flowchart of a method for determining a target cell according to Embodiment 1 of the present invention. As shown in FIG. 1, the method includes:
- Step 101 Obtain information about a candidate cell of the mobile terminal.
- the mobile terminal may be a user equipment (hereinafter referred to as a UE), a mobile relay, or the like.
- the UE can be a mobile phone, a personal computer, or the like. This embodiment is described by taking a UE as an example, but is not used to limit the protection range of the mobile terminal.
- the UE may enter the coverage of at least one or more cells, and the UE may use at least one cell as a candidate cell for determining the target cell to obtain its information.
- the information obtained by acquiring the candidate cell is specifically obtained by distinguishing the candidate cell from other cells, that is, information capable of uniquely determining the candidate cell, such as the cell identifier of the candidate cell.
- the candidate cells may be classified into different types according to the information of the obtained candidate cells, and subsequent processing modes may be different for different types.
- the candidate cells can be divided into two types: the cell statistics information has recorded cells and cell records in the cell statistics.
- the Cell Statistic Information (hereinafter referred to as CSI) may include: specific information of a cell that has served the UE (hereinafter referred to as: cell specific information) and a cell that the UE has served for the UE. Specific information in the following (hereinafter referred to as: UE specific information).
- the cell-specific information refers to the information of the cell itself in the system broadcast of the cell. For the LTE system, it can be from the main information block (Master Information Block, the following tube is called: MIB), and each system message block (System Information Block, below) The barrel is called: SIB).
- the UE-specific information refers to the information about the UE in the process of the UE staying in a serving cell, that is, the information that the UE associates with a specific cell, and specifically may use access information, service features, behavior characteristics, connection quality, and the like. Characterize.
- the CSI may be obtained by the UE or may be obtained by the network side device.
- the current target cell is determined by using the method provided by the embodiment of the present invention.
- the cell may be processed by other existing methods or processes, and the relevant conditions are met.
- the serving cell of the UE is further recorded in the CSI, and the method according to the embodiment of the present invention is used to determine whether it is the current target cell.
- Step 102 If the candidate cell is a preferred cell determined according to CSI, determine that the candidate cell is a target cell of the UE.
- the UE specific information may include, but is not limited to, including one or more of the following information: a staying time of the UE in the serving cell, handover result information, information expected to access the cell, service experience, wireless channel quality, access Time, direction, speed, UE-specific User Profile (Subscriber Profile Identifier, below: SPID) information.
- a staying time of the UE in the serving cell handover result information
- information expected to access the cell service experience
- wireless channel quality access Time
- direction, speed UE-specific User Profile (Subscriber Profile Identifier, below: SPID) information.
- SPID Subscriber Profile Identifier
- the cell specific information may include, but is not limited to, one or more of the following information: cell identity, cell type, radio access (Radio Acess Technology, hereinafter referred to as: RAT) information, Frequency information, frequency priority information, network planning (such as public land mobile communication network (Public Land Mobile-communication Network, PLMN) identification, location area identification, etc.) related parameters, cell transmission power, location of the cell Information, wireless access system information, etc.
- RAT Radio Acess Technology
- PLMN Public Land Mobile-communication Network
- PLMN Public Land Mobile-communication Network
- location area identification etc.
- these parameters can be read from the broadcast information of the cell.
- the SIB 1 of the LTE system can obtain the Track Area Code (hereinafter referred to as: TAC), the cell identifier, etc.; for example, from the SIB2 of the LTE system.
- TAC Track Area Code
- the reference signal power (referenceSignalPower) is obtained as the base station transmission power, and thus the cell type and the like can be obtained.
- the cell specific information is not limited to the above parameters. As long as the cell related information has certain regularity and repeatability, it can be used as the cell specific information as the subsequent first risk information.
- the cell specific information may also be a parameter in each SIB, or may be a parameter in a multimedia broadcast multicast service control channel (hereinafter referred to as: MCCH) (such as a multimedia broadcast multicast service single frequency network area configuration information).
- MCCH multimedia broadcast multicast service control channel
- the cell specific information may also be information of the cell detected or calculated by the UE, such as the geographical location information of the cell, and the global positioning system may be utilized.
- GPS Global Position System
- cell location technology etc. to know the geographical location of the cell. Since the CSI can reflect the regularity and repeatability of the UE mobility, the UE target cell can be selected according to the CSI optimization. A detailed explanation of these parameters can be found in Table 2 after this embodiment. It should be noted that the cell specific information is not limited to the parameters shown in Table 2.
- the statistical value of the UE's access time in a particular cell reflects the relative or absolute time that the UE stays in this cell for a period of time.
- the calculation of the dwell time may be a statistical time value of the UE from entering to leaving the cell.
- the entry and exit may be caused by cell reselection, handover, etc., or may be based on the statistical value of the total stay time of the UE for a period of time (such as one day).
- the dwell time can take many forms, for example, in the case of an idle state UE, it can be calculated from camping in, until cell reselection resides to other The period of time when the cell ends.
- the dwell time may be in the form of a cell ranking, a percentage of dwell time, a classification indication of the length of dwell time (such as a long stay, a medium stay, a short stay, an ultra short stay), or a time unit.
- the classification of the length of stay can be calculated by a certain algorithm. For example, if the UE stays in a cell for more than one hour, the cell considers it to be a long-term stay. If it is less than 30 minutes, it is considered to be a medium-term stay, and more than 5 minutes is less than 30 minutes.
- the handover result information may be the handover success rate, the failure rate, the handover too early rate, the handover too late rate, and the handover timely rate associated with the cell. Reflects the last or historical statistical experience value when cutting in or out of this cell. It should be noted that this information statistics is only completed in the active state.
- the access to the small information is a comprehensive evaluation based on the CSI of the UE/network side device.
- the information of the zone can be distinguished by different levels, or whether access is expected.
- For the cell that is expected to be accessed when the cell is reselected and switched, the target cell is preferentially selected.
- Service experience refers to the feeling when the UE is served by this cell. This information is reflected in the bit error rate, packet error rate, radio link failure rate or rate, dropped call rate, service experience or calculated by the above values.
- the moment of access is the moment of regular access to this community.
- the direction is the direction in which the cell enters when accessing the cell, and the speed information when the UE accesses the cell in the speed may be expressed in the form of a cell linked list.
- the UE side can calculate the distance traveled by positioning, and divide by the access time to obtain the approximate speed; or estimate according to the number of cells visited in a period of time.
- the UE-specific SPID information is a UE-specific attribute set by the operator, and is mainly used to distinguish
- GSM Global System for Mobile communications
- GERAN GSM/EDGE Radio Access Network
- the UE can know which network it should preferentially camp on (for this UE, Therefore, the LTE network is preferentially camped on, so that the operator can implement the resident control of the UE in the idle state and utilize the network resources efficiently.
- RRC Radio Resource Control
- the cell identifier is only used to identify the cell.
- the PCI and the ECGL may also record the sequence of the cells in the mobile track, for example, in the form of a linked list, so that the sequence of the UE crossing the cell or Adjacent relationship.
- the next cell identifier can be known. Prepare for switching in advance.
- the cell list is...-ABC-..., when the target base station receives the handover request from the source base station, the source cell identifier A is obtained, and after the target base station completes the handover of the UE, the current serving cell B is obtained, and the current The base station (original target base station) can know the next target cell C based on the ⁇ , zone identifiers A, B, and the previous cell identity list.
- the cell identity may also be associated with another cell identity, such as the cell identity of the coverage macro network at the current low power node cell location. Use this information, once the mobile terminal enters this Each macro cell can know that it will be close to the corresponding low power node.
- Cell type Macro network is still a low power node; Relay, Pico or H(e)NB;
- the UE Used to identify the type of base station and take different measurement or handover strategies. For example: 1) Apply different measurement triggering times: For low-power nodes, the UE can meet the measurement threshold and report the measurement with a smaller trigger time. Because the coverage of the low-power node is limited, if the triggering time is too long, the cell will increase the handover failure. For the macro network, after the measurement threshold is met, the measurement can be reported at a larger trigger time, and the ping-pong switching probability is reduced. 2) Knowing different target network architectures: When switching, if the current base station is a macro base station and the type of the target cell is H(e)NB, the handover process of the macro network to the H(e)NB network is adopted. If the target cell is also a macro base station, handover between macro base stations is applied.
- the frequency information service base station can know the next target small or frequency priority information zone identifier in advance according to the cell identity linked list, and know the RAT or frequency of the next target cell according to the parameter, and prepare to switch to the UE configuration next time.
- the RAT or frequency is configured to the UE, so that the UE measures the RAT or frequency of the cell, speeds up the measurement process, and improves the targeting of the measured RAT or frequency, especially when the RAT or frequency is related to the current service.
- the cell is different RAT or different frequency.
- 3gpp and Non-3gpp information can be similar.
- WLAN Wireless Local Area Network
- Wimax Worldwide Interoperability for Microwave Access
- LTE, 2G or 3G LTE, 2G or 3G
- WLAN Or WiMax can provide high-speed data services, then when the UE enters the area of the network where WLAN or WiMax is deployed for a long time. (such as home, office, etc.), can migrate services to WLAN or WiMax to get a better business experience, and also help operators to divert some data services and reduce congestion on LTE, 2G or 3G networks.
- the UE records the cell identifier of the LTE cell in the long-term stay area or the LTE cell in the vicinity of the WiMax network or the geographic location information of the WLAN or WiMax network, when the UE enters the long-term stay area again (by comparing the geographical location twice) ), the base station of the LTE, 2G or 3G network can be indicated by signaling, and then the 2G, 3G or LTE base station is triggered to migrate the service to the WLAN or the WiMax network, thereby improving the user experience and freeing more 2G and 3G. Or the resources of the LTE network, which increases the system capacity. This method can be further applied to other access systems and access systems, and is not mentioned here.
- TAI Track Area Identifier
- PLMN Packet Data Network
- the base station transmit frequency adjusts the decision condition of the cell reselection and/or handover according to the transmit power information of the base station (which may be a specific value or power level information) or increases or decreases an offset value, so that some base stations The cells are more likely to be accessed by the UE or less likely to leave, thereby optimizing cell reselection and/or handover. For example, when a UE with an idle state is close to a base station with a lower transmit power, it is preferentially reselected to enter a low-power node, which can be implemented by adding an offset to the measured value of the low-power node cell, and leaving the low-power node. Adding an offset in the opposite direction makes it less likely to leave the low power node.
- the priority switching entry is made or the low-power node is not easily cut out.
- the UE may also report the base station transmit power information to the base station.
- the base station uses the power information as an input condition to optimize the handover. For example, the UE indicates that the target base station is a low power node, then the source base station The UE preferentially switches to the cell of this low power node. Since such a mechanism expands the coverage of low-power nodes, more UEs are served by low-power nodes, and the macro network can provide more resources to other UEs, and the system capacity is finally improved.
- the location information of the cell may be calculated by the UE based on the global positioning system or the cell location technology.
- the cell identifier of the macro network with the coverage location may be located at the cell level, and the GPS may be used for longitude.
- the angular positioning of the latitude After the UE saves the geographical location information of the cell, when he enters the vicinity of the location again, the cell reselection and/or the cell specific information and/or the cell specific information mentioned in this embodiment of the present invention are started in advance. Switch optimization.
- the idle state UE finds itself entering a location near a long-resident and/or low-power cell, it starts detecting the cell, and according to the low-power node, increases the offset, so that the UE camps in the cell in advance; For example, once an active UE finds itself entering a location near its own long-lived and/or low-powered cell, it initiates an indication to inform the network that it is close to the cell, and can carry CSI information (such as frequency information of CSI information, cell). Identifying information or low power indication information) to the network, thereby triggering the network to switch the UE to the small
- the area may be specifically configured to perform measurement control on the cell, and then initiate a handover process.
- the CSI information may be reported to the network one or more times, and the secondary base station performs handover optimization.
- the method for determining a target cell obtained by this embodiment obtains information about a candidate cell of the mobile terminal, and determines whether the candidate cell is a preferred cell determined according to the cell statistics, and if yes, determines that the candidate cell is the target of the mobile terminal. a cell; wherein the cell statistics include specific information of a cell that has served the mobile terminal and specific information of the cell in which the mobile terminal has served.
- the method for determining the target cell according to the cell statistics information effectively avoids the blind handover/reselection of the mobile terminal to any candidate cell, saves network resources, and provides a more stable and reliable service for the user. Especially for delay sensitive services, the speed of UE reselection or handover to the desired cell of the UE is accelerated.
- FIG. 2 is a flowchart of a method for determining a target cell according to an embodiment of the present invention. As shown in FIG. 2, in this embodiment, a method for determining a target cell is performed by using a CSI as an example, and the method includes:
- An optional step 201 the UE sends a report to the base station whether the CSI function is supported.
- the base station notifies the UE to enable or disable the CSI function.
- the base station may notify the UE to enable or disable the CSI function by using an RRC connection reconfiguration message.
- the base station configures a CSI measurement control message for the UE.
- the base station may configure a CSI measurement control message for the UE by using an RRC connection reconfiguration message.
- the UE may be in an idle state (ie, an Idle state) or an active state (ie, in a CSI composed of cell-specific information of all cells that have served it and UE-specific information in each serving cell. Active state). Preferably, it is in an idle state because the UE is in an idle state. There is no need to rely on the RRC connection established by the UE with the network, which has the effect of saving power. However, if the normal service of the UE needs to be in an active state and span multiple cells, the UE may also collect CSI information in an active state in order to make the collected information continuous and complete. Of course, the statistics of the CSI in the active state of the UE can additionally count some parameters in the active state. For details, refer to the parameter descriptions in Table 1 and Table 2.
- Step 205 Save the calculated CSI in the UE.
- the CSI can be saved in whole or in part, and the UE-specific information and the cell-specific information can be saved separately.
- the obtained CSI is saved in the order of the UE accessing the cell.
- the complete linked list form that is, the cells are connected in series using a one-way or two-way linked list, and one unit in the linked list is the CSI information of one cell.
- the order of the cells in the linked list may be the order of access of the UEs between the cells.
- the access cell linked list and the CSI information as shown in Table 4 are shown in Table 3.
- the CSI can be stored in a classification-based information store, for example, according to a CSI.
- the parameters are classified and the information is stored. For example, according to the length and duration of the dwell time, the dwell time is divided into long-term stay, normal stay, short stay, etc.
- all or part of the classification is stored separately according to needs. The advantage of doing this is to reduce storage space according to actual needs.
- Other categories are no longer-described, for example, they can also be classified according to cell type and cell power information.
- the CSI can also be stored in a ranking-based information store, such as selecting a dimension, ranking CSI, and storing CSI by rank.
- a ranking-based information store such as selecting a dimension, ranking CSI, and storing CSI by rank.
- CSL which stores the five cells with the longest retention time, has the same benefit of reducing storage space.
- the way the CSI is saved can also be determined by the UE.
- the CSI of some cells may be selectively stored by the UE, and the cells may be continuous or discontinuous.
- the UE may save the CSI of some of the frequently resident low power node cells.
- Step 206 When the UE needs to determine its target cell during the mobile process, the UE acquires information about the candidate cell.
- the candidate cell is a cell that satisfies the condition of the cell handover/reselection signal, and the information of the candidate cell may be a cell marker.
- Step 207 If the candidate cell is a preferred cell determined by the UE according to the CSI, determine that the candidate cell is a target cell of the UE. If the candidate cell is an excluded cell determined by the UE according to the CSI, the candidate cell is excluded as the target cell. .
- the UE may determine a preferred cell or an excluded cell according to one or more parameters in the CSI.
- the CSI includes the cell identifier of the cell that has served the UE and the staying time of the UE in the cell that has served the UE
- the manner in which the UE determines the preferred/excluded cell is: determining the UE by using the cell identifier and CSI of the candidate cell. Whether the dwell time in the candidate cell satisfies a threshold value as a preferred/excluded cell, and if so, determines that the candidate cell is a preferred/excluded cell.
- the threshold value here can be understood as: It can be either a specific time value or an identifier representing different meanings.
- a specific time value may be set as the threshold value.
- the threshold of the preferred cell is 8 hours. Whether it is work or rest, the time in the unit or home should exceed 8 hours, then it is a more preferable way to use the specific time value of 8 hours as the threshold value.
- the threshold of the excluded cell is 5 minutes, which is used to represent the fast-swept cell and is excluded.
- a certain type of flag can be set as the threshold. For example, the threshold of the preferred cell is long. When staying, the threshold of the excluded cell is a short stay and so on.
- the reselection or handover of the target cell is not performed. This situation can effectively reduce unnecessary reselection or handover, and save network resources.
- Residence time For those UEs that have entered the cell for a long time and stay in this cell for a long time, it can be predicted that the UE will stay for a long time, then try to select/reselect/switch to this cell, try to make this cell a UE.
- the service is provided, and the corresponding subsequent initiating service will also be initiated from the cell, thereby improving the system capacity by using the low-power cell as much as possible, and also selecting/re-selecting/switching to the cell in advance; for those who enter a certain cell in history After that, the UE staying in the cell for a short period of time can predict that the subsequent stay will be short-lived.
- This cell is initiated to reduce unnecessary cell selection/reselection/handover procedures, reduce signaling interaction and device processing, and at the same time, due to the decrease in the number of cell selection/reselection/handover, the possibility of selection/reselection/switching failure may also occur. reduce.
- Time of visit The time of entry into/out of this cell.
- the UE can use this time to compare with the current time to determine whether it conforms to the law, and can be used as one of the input references when deciding whether to apply other CSI parameters.
- Speed For the UE, for a cell with a historically low speed in this cell, it can be selected/reselected/switched as a high-priority cell, and a cell with a higher speed can be selected/reselected in a lower priority cell. Switch the cell. Because especially for low power cells, fast speed means that the UE will move out quickly and another selection/reselection/switching will occur immediately.
- determining the candidate cell as the target cell may also be as follows: Add a preset offset to the target cell. Taking the dwell time in the CSI as an example, the UE can satisfy A cell with a long stay time is selected as a target cell in a cell with a signal condition, or a cell reselection/switching offset may be added to a cell with a long dwell time. Taking the cell type in the CSI as an example, the UE may select a Pico cell as the target cell in the cell that satisfies the signal condition, or may add a cell reselection/switching offset to the Pico cell.
- the UE may preferentially select the low-power cell as the target cell in the cell that satisfies the signal condition when the current serving cell is the macro cell, or give the low-power when the current serving cell is the macro cell.
- the cell adds a cell reselection/switching offset.
- the target cell can be selected by referring to the information of the dwell time and the cell power information.
- the UE can select a low-power cell with a long dwell time as the target cell in the cell that meets the signal condition, or can provide a low-power cell with a long dwell time. Add a cell reselection/switching offset. Thereby, unnecessary reselection/selection/switching can be avoided, and the speed of selecting a cell to stay for a long time is accelerated.
- Step 208 When the UE is in an idle state, the UE is reselected into the target cell; when the UE is in an active state, the UE is handed over to the target cell.
- the UE may actively send a proximity indication to the network-side device, where the proximity indication may instruct the network-side device to reselect/switch the UE to the nearby low-power cell.
- the proximity can be understood as follows: When the UE enters or leaves a CSG cell, and the CSG ID is in the UE's white list, the UE initiates a proximity indication message to the network side.
- the proximity detection is based on the UE's autonomous search function, and the UE autonomous search function is the implementation of the UE, which decides when to search for the CSG cell that is allowed to access.
- the dwell time and the location information are used as an example.
- the UE sends an indication to the network side device to notify the UE that the cell has a longer dwell time.
- the UE when the UE is close to the Pico cell with a long dwell time, the UE sends an indication to the network side device to notify the UE to approach the Pico cell with a long dwell time.
- the network side device sends an indication to the UE to approach a low-power cell with a long dwell time.
- FIG. 3 is a flowchart of a method for determining a target cell according to an embodiment of the present invention.
- a UE acquires CSI and then sends a CSI to a network side device, and a network side device performs cell selection/reselection/switching as an example.
- a method for determining a target cell is described in detail, and the method includes:
- Steps 301 to 305 may refer to steps 201 to 205 in the foregoing embodiment. I will not go into details here.
- Step 306 The UE sends the statistic CSI to the network side device.
- the network side device here may be a base station, a core network device, or the like.
- the transmitted CSI may be part of the CSI obtained by the UE, or may be all CSI.
- part of the CSI means that the UE selects a part of CSIs for transmission, and the serving cell corresponding to the CSIs has a reference function for the selection/reselection/switching currently being or will be performed; all CSIs refer to all CSIs obtained by the UE, part of which Information may not be used immediately, but it can be used as a reference for subsequent methods.
- the specific transmission of part or all of the CSI depends on the control of the network or the decision of the UE. When the network is controlled, the network side device is required to send an indication to the UE.
- the way the CSI is sent can include:
- Event Trigger The UE's measurement event triggers the UE to send CSI to the network side device.
- the CSI is sent via a measurement report message.
- Periodic report Set a period to the UE, such as every other day. Since the CSI is relatively stable, the operator can control the increase in traffic caused by the CSI transmission by using the set period.
- Dedicated signaling Introduces new dedicated signaling, requesting the UE to send immediately when the network side device needs it.
- the CSI is updated: When the UE detects that the CSI is updated, the updated part or the updated all CSI is sent to the network side device.
- Step 307 The network side device saves the received CSI.
- Step 308 When the UE needs to determine its target cell during the mobile process, the network side device acquires information of the UE candidate cell.
- the candidate cell is a cell that satisfies the condition of the cell handover/reselection signal, and the information of the candidate cell may be a cell marker.
- Step 309 If the candidate cell is a preferred cell determined according to the CSI, determine that the candidate cell is a target cell of the UE. If the candidate cell is an excluded cell determined according to the CSI, the candidate cell is excluded as the target cell.
- determining the candidate cell as the target cell may also be as follows: Add a preset offset to the specific cell according to the CSI information. Taking the dwell time in the CSI as an example, the network side device may select a cell with a long dwell time as a target cell in a cell that satisfies the signal condition, or the network side device may add an offset to the cell with a long dwell time.
- the target cell can be selected by referring to the information of the dwell time and the cell power information. That is, the network side device can select a low-power cell with a long dwell time as the target cell in the cell that meets the signal condition, or can provide a low dwell time.
- the power cell adds an offset. This avoids unnecessary selection/reselection/switching, and selects/reselects/switches to a long-term staying cell in advance.
- This embodiment can perform the determination of the preferred/excluded cell according to various information in the CSI. For example, (1) dwell time: For those UEs that have entered the cell for a long time and stay in this cell for a long time, it can be predicted that the UE will continue to stay for a long time, and then try to switch to this cell, and try to let this cell provide services for the UE. The corresponding subsequent initiating service will also be initiated from this cell, so that by using the low-power cell as much as possible to improve the system capacity, it is also possible to switch to the cell in advance; for those who have entered a certain cell in history, stay in the cell for a short time. The UE can predict that the short-term stay will be followed, and try not to switch to the cell.
- (1) dwell time For those UEs that have entered the cell for a long time and stay in this cell for a long time, it can be predicted that the UE will continue to stay for a long time, and then try to switch to this cell, and try to let this cell provide services
- Time of visit The time of entry into/out of this cell.
- handover optimization can be based on this information. For example, after counting a large number of UE access times, the peak period of accessing the cell can be calculated, for example, obtaining all access times, if the number of UEs at a certain access time (for example, accurate to 1 minute, or 10 minutes) exceeds a preset.
- the value of the base station determines that at this time, a high load is about to occur, and then, at the peak period, some of the original UEs in the base station are switched to other cells in advance, releasing more resources for the upcoming high load preparation.
- a cause value is used to indicate that the load is about to go high to the handover target cell, so that the target cell receives the handover UEs with high priority.
- the cell with a lower speed in the history of the cell can be used as the high priority cell handover target cell, and the cell with higher speed can switch the target cell with the lower priority cell. Because especially for low power cells, fast speed means that the UE will move out quickly and another switch will occur immediately.
- Switching result or success rate information A cell with a good handover result in history can be used as a high priority handover cell, and a poor result cell can be used as a low priority handover cell. This will improve the reliability of the handover. For example, a cell whose switching success rate is higher than a preset value is considered to be a cell with better switching result or higher success rate, and vice versa is considered to be a cell with poor handover result or low success rate.
- the priority switching may be performed by selecting a cell with better handover result in the cell range that satisfies the measurement result, or adding a preset offset to the cell with better handover result or higher success rate based on the measurement result.
- Direction It can be compared with the time and direction of entering and leaving the community in history, and network optimization can also be performed based on this information. For example, after counting a large number of UE access times, you can find out the peak hours of work, where a large number of switches are cut, and where to cut.
- Step 310 When the UE is in an idle state, reselect the UE into the target cell. When the UE is in an active state, the UE is handed over to the target cell.
- FIG. 4 is a flowchart of a method for determining a target cell according to an embodiment of the present invention. As shown in FIG. 4, in this embodiment, a method for determining a target cell by using a CSI directly by a network device is used as an example, and the method includes:
- Step 401 The network side device acquires, and saves, the CSI of the UE.
- the network side device may be a base station, an operation and maintenance system (Operational and Maintenance) (hereinafter referred to as: OAM) or a core network node (such as a GPRS GPRS Support Node (hereinafter referred to as: SGSN), a mobility management unit) (Mobility Management Entity, hereinafter referred to as: MME), Home Location Register (hereinafter referred to as: HLR), User Database (Home Subscriber Server, hereinafter referred to as: HSS), preferred core network node.
- OAM operation and maintenance system
- MME Mobility Management Entity
- HLR Home Location Register
- HSS User Database
- the specific method for obtaining the CSI of the UE may include:
- the first type In the completion phase of the handover process, the radio access network (Radio Access Network, hereinafter referred to as: RAN) and the handover related message of the core network carry CSI information to the MME.
- RAN Radio Access Network
- the LTE X2 handover is used as an example, and the eNB reports the path switch message reported by the MME to the MME.
- the LTE S1 handover is used as an example, and the eNB reports the handover notification (Handover Notify) message to the MME.
- the second type The UE ends the service, and when the network releases the UE connection, the RAN and the core network message are used to carry the CSI information.
- the MME may be carried in the UE Context Release Complete (CONTEXT RELEASE COMPLETE) or UE Context Release Request (CONTEXT RELEASE REQUEST) message.
- the core network node After the core network node obtains the CSI information, it can be further transferred to other core network nodes for centralized management, such as being stored in the user's subscription data server, home location register, or OAM server, and requesting acquisition through signaling.
- the CSI When the CSI is updated, obtain the updated CSI or all the updated CSI. Need to explain Yes, the advantage of the CSI on the network side device is that the CSI can be obtained in advance, and the air interface process is reduced to reduce the delay.
- Step 402 The handover decision entity on the network side obtains the saved CSI information.
- the handover decision entity is located at the base station. If the CSI information is stored in the MME, the CSI information needs to be obtained through signaling between the base station and the MME.
- the network side handover decision entity may also be carried by the source base station to the current base station when the UE handovers into the current base station.
- Step 403 When the UE needs to determine its target cell during the mobile process, the network side device acquires information of the UE candidate cell.
- the candidate cell is a cell that satisfies the condition of the cell handover/reselection signal, and the information of the candidate cell may be a cell marker.
- Step 404 If the candidate cell is a preferred cell determined according to the CSI, determine that the candidate cell is a target cell of the UE; if the candidate cell is an excluded cell determined according to the CSI, the candidate cell is excluded as the target cell;
- the network side device may select the target cell to be switched according to one or more parameters in the received CSI.
- the specific method is to select a handover target cell by using CSI information in a cell that satisfies a signal condition, or may add a preset offset to a specific cell according to CSI information. Taking the dwell time in the CSI as an example, the UE may select a cell with a long dwell time as the handover target cell in the cell that satisfies the signal condition, and the network side device may add an offset to the cell with a long dwell time.
- the handover target cell may be selected by referring to the information of the dwell time and the cell power information, that is, the network side device may select a low power cell with a long dwell time as the handover target cell in the cell that meets the signal condition, or may give a long stay time.
- the low power cell adds an offset. Thereby, unnecessary handover can be avoided, and the cell that stays for a long time is switched in advance.
- This embodiment can perform the determination of the preferred/excluded cell according to various information in the CSI. For example, (1) dwell time: For those UEs that have entered the cell for a long time and stay in this cell for a long time, it can be predicted that the UE will continue to stay for a long time, and then try to switch to this cell, and try to let this cell provide services for the UE.
- the corresponding subsequent initiating service will also be initiated from this cell, so as to try to charge
- a low-power cell to increase the system capacity
- a cell with a good service experience result in history can be used as a high priority cell handover target cell, and a poor result cell can be used as a low priority cell handover target cell. This can improve the quality of the handover target cell.
- Time of visit The time of entry into/out of this cell.
- the UE can use this time to compare with the current time to determine whether it conforms to the law. It can be used as one of the input references when deciding whether to apply other CSI parameters.
- the handover optimization can be performed based on this information. For example, after counting a large number of UE access times, the peak period of accessing the cell can be calculated, for example, obtaining all access times, if the number of UEs at a certain access time (for example, accurate to 1 minute, or 10 minutes) exceeds one preset.
- the value of the base station determines that at this time, a high load is about to occur, and then, during the peak period, some of the original UEs in the base station are switched to other cells in advance, releasing more resources for the upcoming high load preparation. And a cause value is used to indicate that the load is about to go high to the handover target cell, so that the target cell receives the handover UEs with high priority.
- the cell with a lower speed in this cell can be used as the high priority cell handover target cell, and the higher speed cell can switch the target cell with the lower priority cell. Because especially for low power cells, fast speed means that the UE will move out quickly and another switch will occur immediately.
- Switching result or success rate information A cell with a good handover result in history can be used as a high-priority handover cell, and a poorly-performing cell can switch cells with low priority. This can improve the reliability of the handover. For example, a cell whose switching success rate is higher than a preset value is considered to be a cell with a better handover result or a higher success rate, and vice versa, which is considered to be a poor handover result or a low success rate. Community.
- the specific priority of the handover may be that the cell with better handover result is selected in the cell range that meets the measurement result, or a preset offset is added to the cell with better handover result or higher success rate based on the measurement result.
- Direction It can be compared with the time and direction of entering and leaving the community in history, and network optimization can also be performed based on this information. For example, after counting a large number of UE access times, you can find typical moments such as the peak period of the upper and lower shifts, where a large number of switches are cut and where they are cut.
- the network side device can select the cell with the longest dwell time in the CSI as the target cell of the handover in each of the selectable serving cells, so as to avoid waste and service interruption caused by unnecessary handover. Wait.
- Step 405 When the UE is in an idle state, the UE is reselected into the target cell; when the UE is in an active state, the UE is handed over to the target cell.
- FIG. 5 is a flowchart of a method for determining a target cell according to an embodiment of the present invention. As shown in FIG. 5, in this embodiment, a method for determining a target cell by using a network side device to obtain CSI and sending the message to the UE is described in detail. Methods include:
- Steps 501 to 502 may refer to steps 401 to 402 in the foregoing embodiment, and details are not described herein.
- Step 503 The network side determining entity sends the acquired CSI of the UE to the UE.
- the network side device may send the message to the UE in an RRC connection setup message, an RRC connection reconfiguration message, or a NAS message.
- Steps 504 to 506 may refer to steps 206 to 208 in the foregoing embodiment, and details are not described herein.
- the network side device and the UE can perform appropriate reselection/switching according to the CSI information to avoid unnecessary switching or reselection, for example, predicting When the UE quickly passes through certain cells, it may not switch or reselect to these cells, but stay in the macro network. Effectively reduce the number of service interruptions after switching/reselecting the number Reduced, especially for latency-sensitive services, improves the user experience. At the same time, since the number of handovers is reduced and the handover success rate is a certain value, the number of potential handover failures is relatively reduced.
- the mobile terminal when the cell is selected/reselected, the mobile terminal tries to avoid accessing the cell that stays for a short time by fully considering the CSI, thereby avoiding frequent consumption of resources such as selection/reselection, and leaving the resources of the cell.
- the mobile terminals that are camped in the cell for a long time, and try to select low-power nodes for camping make full use of these node resources, and improve the network system capacity. If the CSI is saved according to the mobile trajectory of the mobile terminal, the next cell moved by the mobile terminal can be known in advance according to the CSI, and the behavior and information of the mobile terminal in the next cell are known in advance, and the information is fully utilized for switching/reselection/ Optimized for selection.
- FIG. 6 is a schematic structural diagram of a mobile terminal according to Embodiment 6 of the present invention.
- the mobile terminal is a specific execution body of the foregoing method embodiment, and thus the method is implemented. The contents of the examples are incorporated in this embodiment in the form of citations.
- the mobile terminal includes: an obtaining module 601 and a determining module 602.
- the obtaining module 601 is configured to obtain information about candidate cells.
- the determining module 602 is configured to: if the candidate cell acquired by the obtaining module 601 is a preferred cell determined according to the cell statistics, determine that the candidate cell is the target cell; where the cell statistics information includes: specific information of the cell that once served the mobile terminal The specific information of the mobile terminal in the cell that once served the mobile terminal.
- the mobile terminal may further include: an obtaining module 603, which is a second structural diagram of the mobile terminal, as shown in FIG. 7, the obtaining module 603 is configured to obtain cell statistics.
- the obtaining module 603 includes a recording unit for recording specific information of a cell that has served the mobile terminal, and specific information of the mobile terminal in the cell that has served the mobile terminal.
- the mobile terminal may further include: a sending module 604, a third structural schematic diagram of the mobile terminal shown in FIG. 8, the sending module 604 is configured to send the obtaining module 603.
- the obtained cell statistics information is sent to the network side device.
- the cell statistics information at least includes: The cell identity of the cell and the dwell time of the mobile terminal in the cell that once served the mobile terminal; then the determining module 602 includes a first determining unit.
- the first determining unit is configured to determine, by using a cell identifier of the candidate cell and the cell statistics, whether the dwell time of the mobile terminal in the candidate cell meets a threshold value of the preferred cell, and if yes, determining that the candidate cell is a preferred cell. .
- the cell statistics information includes at least: a cell identifier of a cell that has served the mobile terminal, and a dwell time of the mobile terminal in a cell that has served the mobile terminal; and the determining module 602 includes the second determining. unit.
- the second determining unit is configured to determine, by using a cell identifier of the candidate cell, the cell statistic information, whether the dwell time of the mobile terminal in the candidate cell meets a threshold value of the excluded cell, and if yes, determining that the candidate cell is an excluded cell .
- FIG. 9 is a schematic structural diagram of a network side device according to an embodiment of the present invention.
- the network side device includes: an obtaining module 901 and a determining module 902.
- the obtaining module 901 is configured to acquire candidate cell information of the mobile terminal.
- the determining module 902 is configured to determine, if the candidate cell acquired by the obtaining module 901 is a preferred cell determined according to the cell statistics, the candidate cell is the target cell of the mobile terminal.
- the cell statistics information includes: specific information of a cell that has served the mobile terminal and specific information of the mobile terminal in a cell that has served the mobile terminal.
- the network side device further includes: an obtaining module 903, and FIG. 10 is a schematic diagram of a second structure of the network side device according to the embodiment of the present invention.
- the obtaining module 903 is configured to obtain specific information of a cell that has served the mobile terminal and a mobile terminal in a cell that has served the mobile terminal from a core network or an operation and maintenance system, and/or in a process of establishing a call by the mobile terminal. Specific information.
- the network side device further includes: a sending module 904, and FIG. 11 is a third structural schematic diagram of the network side device according to the embodiment of the present invention.
- the sending module 904 is configured to send the cell statistics obtained by the obtaining module 903 to the mobile terminal.
- the determining module 902 is further configured to: If the candidate cell is an excluded cell determined according to the cell statistical information, the candidate cell is excluded from becoming the target cell.
- the network side device further includes: a reselection module 905 and/or a switching module 906.
- FIG. 12 is a schematic diagram of a fourth structure of a network side device according to an embodiment of the present invention.
- the reselection module 905 is configured to reselect the mobile terminal to the target cell determined by the determining module 902 when the mobile terminal is in an idle state.
- the handover module 906 is configured to switch the mobile terminal to the target cell determined by the determination module 902 when the mobile terminal is in an active state.
- the device provided by the embodiment of the present invention obtains the information of the candidate cell of the mobile terminal, and determines whether the candidate cell is a preferred cell determined according to the cell statistics, and if yes, determines that the candidate cell is the target cell of the mobile terminal;
- the cell statistics include specific information of the cell that has served the mobile terminal and specific information in the cell that the mobile terminal has served for.
- the method for determining the target cell according to the cell statistics information can effectively avoid the blind handover/reselection of the mobile terminal to any candidate cell, save network resources, and provide a more stable and reliable service for the user.
Abstract
Description
Claims
Priority Applications (5)
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EP11833861.5A EP2624630B1 (en) | 2010-10-20 | 2011-10-20 | Method and device for determining a target cell |
JP2013534156A JP5828527B2 (ja) | 2010-10-20 | 2011-10-20 | ターゲットセルを決定するための方法および装置 |
KR1020137012192A KR101556289B1 (ko) | 2010-10-20 | 2011-10-20 | 타겟 셀을 결정하기 위한 방법 및 장치 |
US13/866,759 US9042897B2 (en) | 2010-10-20 | 2013-04-19 | Method and device for determining target cell |
US14/703,264 US9313703B2 (en) | 2010-10-20 | 2015-05-04 | Method and device for determining target cell |
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CN201010516031.4A CN102457918B (zh) | 2010-10-20 | 2010-10-20 | 确定目标小区的方法和设备 |
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US9313703B2 (en) | 2016-04-12 |
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EP2624630A1 (en) | 2013-08-07 |
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US20130231115A1 (en) | 2013-09-05 |
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