WO2008006278A1 - Procédé et appareil de transfert cellulaire - Google Patents
Procédé et appareil de transfert cellulaire Download PDFInfo
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- WO2008006278A1 WO2008006278A1 PCT/CN2007/001742 CN2007001742W WO2008006278A1 WO 2008006278 A1 WO2008006278 A1 WO 2008006278A1 CN 2007001742 W CN2007001742 W CN 2007001742W WO 2008006278 A1 WO2008006278 A1 WO 2008006278A1
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- Prior art keywords
- cell
- active set
- terminal
- independent offset
- measurement
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000005259 measurement Methods 0.000 claims description 111
- 238000011156 evaluation Methods 0.000 claims description 46
- 238000012544 monitoring process Methods 0.000 claims description 34
- 230000000694 effects Effects 0.000 claims description 8
- 238000012217 deletion Methods 0.000 claims description 7
- 230000037430 deletion Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 3
- 108010001267 Protein Subunits Proteins 0.000 claims 1
- 238000010295 mobile communication Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000004891 communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 4
- 238000012854 evaluation process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- 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
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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
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement 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
- H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
Definitions
- the present invention relates to the field of mobile communication technologies, and in particular, to a cell handover method and device in a mobile communication system.
- the terminal In the peak system of mobile communication, the terminal is handed over due to the continuous movement of the terminal (UE, User Equipment), so the terminal must be switched from the cell where the original terminal is located to the cell where the terminal newly enters, by switching. Update the location of the terminal and the resources used.
- UE User Equipment
- Handover is the most important part of mobility management.
- the link between the original sector and the terminal will be the chain between the new sector and the terminal. A process to replace the road.
- the handover in the call state can be divided into: hard handover and soft handover according to the situation in which the connection between the terminal and the network is established and the frequency occupancy is changed. Inter-cell handover under different base stations), softer handover (inter-sector handover under the same base station).
- WCDMA Wideband Code Division Multiple Access
- Soft Handover means that when a terminal needs to communicate with a new base station, the connection with the original base station is not interrupted first, that is, the terminal performs handover during the coverage edge area of two or more base stations. Before disconnecting from the old cell, the connection with the new cell is established with the same frequency. The terminal simultaneously receives signals of multiple base stations, and several base stations also receive signals of the terminal at the same time, until the terminal meets certain conditions, the terminal cuts off the same The original base station's contact. During the handover process, the terminal maintains communication with the traffic channel simultaneously with all candidate base stations.
- the advantage of soft handover is that the communication is not interrupted during the handover process, which can greatly reduce the call drop caused by the handover.
- the soft handover selects and combines the uplink signals, and the maximum ratio of the downlink signals is combined, and the wireless is also improved. Link performance.
- a pilot channel and a cell set are involved.
- the WCDMA system uses the pilot channel to direct access and handover channels, and the terminal confirms the strongest by processing the pilot channel. Signal part.
- the WCDMA system uses the m-sequence (short PN code) to modulate the pilot channel.
- the time offset of the PN code is different between different pilots.
- the offset between two adjacent pilots is 64 chips, and the terminal passes the identification bias. Move to distinguish different cells.
- active set A collection of cells corresponding to the traffic channel that the current terminal is maintaining.
- Monitor set A neighboring area that is not in the active set but is configured as an active set cell and sent to the terminal in the measurement control message.
- the terminal During the handover process, the terminal often performs a shield evaluation on the handover event, and in the evaluation process, a Cell Independent Offset (CIO) is added as an offset value of the cell quality measurement amount, so that The handover event evaluation during the soft handover process is more accurate.
- CIO Cell Independent Offset
- the cell independent offset is used by the terminal for event evaluation as an offset value for the cell quality measurement.
- the figure is the threshold line N1 that triggers the 1A event; the primary common pilot channel (PCPICH) signal of the cell, the actual signal shield line N2; and the primary common pilot of the cell.
- the signal (PCPICH) signal is added to the threshold line N3 after the cell independent offset.
- the communication operator predetermines that there is a steep rise in the signal quality of the cell by way of road test, etc., and configures a positive cell independent offset according to the steep rise condition, so that the 1A event is triggered in advance, and the cell is Join the event set in time.
- the signal of the cell often does not change slowly. Therefore, in order to trigger a handover or mask an unwanted handover in time, the correct configuration of the cell independent offset is important.
- the cell independent offset parameter is set for the cell, and once set, it will not A change has occurred.
- the value of the unique cell independent offset of a cell is not applicable to all neighbors of the cell.
- cell 1 and cell 2 and cell 3 are mutually co-frequency neighboring cells, and the cell independent offset of cell 1 is configured to be 3 dB.
- the intention of this configuration may simply be to optimize the scenario of switching from cell 2 to cell 1, such as a corner scenario, with the goal of switching as soon as possible.
- there is no such a corner scenario when switching from cell 3 to cell 2 and there is no need to switch in advance by this cell independent offset.
- the network side needs to send the updated measurement control message to the terminal again, including the increase. And deleted neighborhoods. Because the cell independent offset is independently configured for the cell, the cell information that has not changed is not modified when the neighboring cell is added or deleted, and the cell independent offset information of the cell is not modified, and the cell is independent. The amount may not be applicable to the neighbors of these new strengths.
- the inventors have found that at least the following problems exist in the prior art: setting a unique cell independent offset for a cell is not applicable to all neighboring cells of the cell; the cell independent offset is fixed. The actual change of the cell cannot be reflected, so that the handover event evaluation during the handover process is not accurate enough.
- the embodiment of the invention provides a cell handover method and device, so that the handover event evaluation during the handover process is more accurate.
- the network side sends the pre-set active set cell to the terminal with respect to the cell independent offset of each neighboring cell;
- the terminal reports the measurement report to the network side according to the measurement evaluation result
- the network side instructs the terminal to perform cell handover according to the measurement report.
- An independent offset setting unit configured to set a cell independent offset of the active set cell relative to each of its neighboring cells
- an independent offset amount sending unit configured to send the active set cell set by the independent offset setting unit to the terminal with respect to the cell independent offset of each neighboring cell, where the terminal performs cell measurement evaluation and reports measurement report;
- a switching indication unit configured to instruct the terminal to perform cell switching according to the measurement report reported by the terminal.
- An independent offset acquiring unit configured to acquire, from the network side, a small independent offset of the active set cell relative to each neighboring cell;
- a measuring unit configured to measure the active set cell and its neighboring area
- a measurement evaluation unit configured to perform measurement and evaluation according to the measurement result of the measurement unit and a cell independent offset of the active set cell with respect to each neighboring cell;
- a measurement reporting unit configured to report a measurement report to the network according to the measurement evaluation result of the measurement and evaluation unit, so that the network side sends a cell handover indication to the terminal according to the measurement report;
- the cell handover indication on the network side performs cell handover.
- the cell independent offset of each cell relative to each neighboring cell is set for the neighbor relationship, instead of setting a unique cell independent offset for the cell.
- the terminal performs measurement on the cell and its neighboring area, and performs measurement and evaluation based on the independent offset of the cell.
- the measurement report is reported to the network side according to the measurement and evaluation result, and the network side instructs the terminal to perform cell handover according to the measurement report. Therefore, the cell handover is more accurate, the handover can be triggered in time and unnecessary handover is avoided, and the user experience is better.
- FIG. 1 is a schematic diagram of application of a cell independent offset in a soft handover in the prior art
- FIG. 2 is a flowchart of a cell handover method according to an embodiment of the present invention.
- FIG. 3 is a flowchart of a process after a cell of an active set changes according to an embodiment of the present invention
- FIG. 4 is a schematic block diagram of a terminal according to an embodiment of the present invention.
- FIG. 5 is a schematic block diagram of a network controller according to an embodiment of the present invention.
- the embodiment of the present invention is particularly described in a cell switching method capable of supporting a third generation (3G) wireless mobile communication technology: WCDMA communication system, but the present invention is equally applicable to In addition to the mobile communication network mentioned above, especially the CDMA2000 communication system in the third generation wireless mobile communication technology or TD-SCDMA (Time-Division Synchronization Code Division-Multiple-Access, time division duplex-synchronization
- CDMA2000 communication system in the third generation wireless mobile communication technology or TD-SCDMA (Time-Division Synchronization Code Division-Multiple-Access, time division duplex-synchronization
- TD-SCDMA Time-Division Synchronization Code Division-Multiple-Access, time division duplex-synchronization
- the case of a code division multiple access communication system is equally applicable to a narrowband code division multiple access communication system in the second generation (2G) wireless mobile communication technology.
- the network independent side offset is configured by the network side of the WCDMA network to face the neighboring area of the terminal, and the network side sets the pre-set active set cell to the terminal independent offset of each neighboring area.
- the terminal can perform measurement and evaluation in combination with the cell independent offset of the active set cell relative to each neighboring cell, so that the handover event evaluation during the handover process is more accurate, thereby ensuring more accurate cell handover and better user experience.
- FIG. 2 is a flowchart of a cell handover method according to an embodiment of the present invention, which includes the following steps:
- Step 21 The network side sends the preset active set cell to the terminal with respect to the cell independent offset of each neighboring cell.
- the network side sends the preset offset of the cell to the terminal independently with respect to the cell of each neighboring cell.
- the cell independent offset of each active set cell relative to each neighboring cell may be pre-configured for each neighboring cell of each active set cell on the network side.
- the network side can set the independent offset of the cell for each cell of the same frequency/different system, and the value can take a positive value or a negative value.
- each cell has an independent cell independent offset relative to its different neighboring cells.
- the cell independent offsets of the cells relative to the neighboring cells are different. For example, if cell 1 is an active set cell and cell 2 is a monitoring set cell, cell independent offset of cell 1 relative to cell 2 (Celll->Cell2) is set to X (dB); cell 3 is an active set cell, cell
- the cell independent offset of cell 3 relative to cell 2 (Cell3->Cell2) is set to Y (dB).
- the cell 1 can respectively configure different cell independent offsets with respect to the two different neighboring cells of the cell 2 and the cell 3, and so on. .
- the cell independent offset can be left unconfigured (the terminal will default to a CIO of 0 dB). However, through the network optimization process such as road test and radio frequency (RF), it will be found that there is a need to match Set the cell independent offset amount scenario. At this time, the cell independent offset can be configured according to the signal condition of the actual scenario, and the configuration value of the cell independent offset is verified by the second round of road test and radio frequency optimization. .
- RF radio frequency
- the network side When the terminal is initially accessed from a certain cell, that is, when the cell is the optimal cell, the network side sends the cell independent offset to the cell in each neighboring cell, and sends the packet to the terminal through measurement and control.
- the same-frequency/different system neighbor cell information display (CELL INFO) cell is sent to the terminal in the measurement control message delivered by the network side.
- the cell When the terminal initially accesses from a certain cell, that is, the cell is the optimal cell. When the initial cells accessed by the terminal are different, the cell independent offsets of the cells relative to the neighboring cells are also different.
- Step 22 The terminal measures the active set cell and its neighboring area, and performs measurement and evaluation according to the measurement result and the cell independent offset of the cell relative to each neighboring cell, and reports the measurement report according to the measurement and evaluation result.
- the measurement of the cell by the terminal in this step is prior art, wherein the measured cell includes an active set cell and a monitoring set cell. After initial access to the cell, the measured cell includes the initial access cell, and its neighbor. After the terminal accesses the cell for a certain period of time, there may be multiple active set cells. At this time, there are also cases where the terminal measures the active set cell and its neighboring cell.
- the target cell in the monitoring set/detection set is measured to meet the pilot quality:
- the target cell joins the active set list of the terminal, and marks it as the cell to be added to the active set, and reports the measurement report to the network side.
- This event is called EventlA (Event 1A) or the wireless link increase event; If the above formula (1) or the active set is full, the target cell still belongs to the monitoring set.
- M New is the pilot quality measurement result of the target cell
- CION ew is configured by the network, and the CIO of the cell relative to the target cell;
- Mi is the pilot quality of the active set cell
- N A is the number of active set cells
- M Best is the optimal cell pilot quality of the active set
- W is a weight parameter, which is sent by the network side to the terminal;
- Rla is the reporting threshold for the 1A event
- H la is the hysteresis of the 1A event
- the target cell pilot quality measured in the active set is met:
- EventlB Event 1B
- radio link deletion event if the above formula (2) is not satisfied, Then the target cell still belongs to the active set.
- Ld is the pilot quality measurement result of the target cell
- ClOoid is the network configuration, the CIO of the optimal cell relative to the target cell;
- Mi is the pilot quality of the active set cell
- N A is the number of active set cells
- M Bes t is the active set optimal cell pilot quality
- W is a weight parameter, which is sent by the network side to the UE;
- Rib is the reporting threshold for IB events
- H lb is the hysteresis of the 1B event
- the measured target pilot quality within the monitored set satisfies:
- M New is the pilot quality measurement result of the target cell
- CIO New is the network configuration, the optimal cell relative to the CIO of the target cell
- CIOmAS is configured by the network, and the CIO of the optimal cell relative to the worst cell of the active set;
- H lc is the hysteresis of the 1C event
- Some of the above formulas (1), (2), and (3) are sent to the terminal by the network side through the measurement control mode, and the terminal performs measurement, and then reports the corresponding event to the network side according to the above evaluation situation. Including but not limited to the above three types of measurement events. ,
- the cell independent offset directly affects the result of the event evaluation. It can be understood that, in the process of evaluating the measurement report based on the independent offset of each cell in the neighboring cell, the evaluation decision condition used may be other methods, such as:
- Eventl A Event 1A or a wireless link addition event
- EventlB Event 1B
- Event 1B Event 1B
- EventlC Event 1C or a wireless link replacement event
- Reporting_range (report range) soft switching gate P ⁇ value
- Hy steresis_e vent 1 A (1A hysteresis) is the hysteresis of the force
- Hysteresis_eventlC (1C hysteresis) is the replacement hysteresis
- ⁇ is the trigger time
- Best-candidate-Pilot-Ec/IO (Best Candidate Pilot Ec/Io) is the strongest value of the pilot Ec/Io of all cells in the monitoring set;
- Pilot_Ec/I0 measured and filtered pilot Eclo
- ClOnew is the cell independent offset of the cell to be added to the active set relative to the active set optimal cell
- ClOold is the cell independent offset of the cell to be deleted in the active set with respect to the active cell of the active set;
- ClOworst is the cell independent offset of the active set worst cell relative to the active set optimal cell. Some of the above parameters are sent to the terminal by the network side through measurement and control, and the terminal performs measurement, and then informs the network side according to the above evaluation situation. It can be seen that the cell independent offset directly affects the result of the event evaluation.
- Step 23 The network side instructs the terminal to perform cell handover according to the measurement report reported by the terminal.
- the network side performs handover evaluation according to the measurement report result on the terminal. If the handover condition is met, the handover indication message is sent to the terminal. If the handover condition is not met, the network side will not process the measurement report.
- the process of performing cell handover is as follows:
- the terminal sends a corresponding event measurement report to the network side according to the event evaluation process of step 22. For example, after receiving the 1A event report, the network side performs handover evaluation, and after receiving the corresponding handover condition, sends a handover indication message to the terminal, where the message includes the target cell information; after receiving the handover indication message, the terminal joins the target cell. Go to the activity set, and mark the target cell in the active set list as the cell that has joined the active set, and send a handover complete message to the network side.
- the network side After receiving the 1B event report, the network side performs handover evaluation, and after receiving the handover condition, sends a handover indication message to the terminal, where the message includes the target cell information; after receiving the handover indication message, the terminal receives the handover target message The activity is deleted in a centralized manner, and a handover completion message is sent to the network side.
- the neighboring cell of the active set cell includes both the neighboring cell of the optimal cell and the neighboring cell of the non-optimal cell. Therefore, in the embodiment of the present invention, when the optimal/non-optimal cell in the active set changes, the network side needs to adjust the cell independent offset of each neighboring cell according to the change of the active centralized cell, and adjust the adjusted The active centralized cell is sent to the terminal with respect to the cell independent offset of each neighboring cell.
- the processing flow after the cell of the active set changes in the embodiment of the present invention shown in FIG. 3 includes the following steps:
- Step 31 The network side learns that the active centralized cell has changed.
- the change of the active set cell may refer to that the active set cell is deleted, or may refer to that the signal strength of the active set cell changes.
- the network side learns that the change of the active centralized cell is a prior art method, which is not described in detail in the embodiments of the present invention.
- Step 32 The network side adjusts the cell independent offset of the active set cell relative to each neighboring cell.
- Step 33 The cell independent offset of the adjusted active set cell relative to each neighboring cell is sent to the terminal.
- Step 34 The terminal performs measurement on the cell and its neighboring area, and performs measurement and evaluation according to the measurement result and the cell independent offset of the cell relative to each neighboring cell, and reports the measurement report according to the measurement evaluation result.
- Step 35 The network side instructs the terminal to perform cell handover according to the measurement report result reported by the terminal.
- the following is a detailed description of the cell independent offset adjustment process after the active centralized cell changes in the embodiment of the present invention.
- Support a certain monitoring set cell A belongs to the common neighboring area of multiple cells (cell 1, cell 2, ...) in the active set.
- the network side can know the signal quality of each cell of the active set, after the cell signal changes, the active set cell with the best signal quality with the neighboring cell relationship with the A cell is selected, and the cell independent offset with respect to the cell A is configured as The new cell independent offset of cell A; if the active set cell with the best quality before and after the signal change is the same, the cell independent offset of the current configuration is kept unchanged.
- the network side does not know the signal quality of each cell in the active set, the current configured cell independent bias is maintained. The amount is unchanged.
- the network side can know the quality of each cell in the active set, after the active set cell is deleted, the active set cell with the best signal quality with the neighboring cell relationship with the A cell is selected, and the cell independent offset with respect to the cell A is configured as The new cell independent offset of cell A; if the active set cell with the best quality before and after deletion is the same, the cell independent offset of the current configuration is kept unchanged.
- the network side does not know the quality of each cell of the active set, and the active set cell corresponding to the current cell independent offset is not deleted (eg, cell 1 is not deleted), then the currently configured cell independent offset is kept unchanged; Otherwise, if the active set cell corresponding to the current cell independent offset is deleted (for example, cell 1 is deleted), the network side randomly selects one cell (such as a cell) from the active set cell having the neighbor relationship with the A cell. 2), configure its cell independent offset with respect to cell A as the new cell independent offset of cell A.
- the quality of each cell of the active set can be known as follows: when the signal strength of the active set cell changes or the active set cell is deleted, the terminal measures the signal quality of the active set cell, and selects the network side of the active set, and selects by the network side.
- the activity set There are three cells in the activity set, which are cells 1, 2, and 3.
- the network side on the network side (in the database), there are two CIO values, Celll->CellA (representing cell A versus cell 1:) and Cell2->CellA, but the network side does not send two CIOs simultaneously.
- the UE because according to the agreement, for the monitoring of a certain cell, the network can only send a CIO to the UE to evaluate the quality of the cell. In this example, the network side sends a CIO of 1->A to the UE to evaluate the quality of the A cell.
- the network side selects the best active set cell with the neighboring cell relationship with the A cell, and configures the cell independent offset amount relative to the cell A as the new cell independent offset of the cell A. .
- the CIO value of the cell 2 relative to the cell A is selected as the new CIO value of the cell A, and the value is sent to the UE. , used to evaluate the shield of the A community. If the active set cell 3 becomes the optimal cell, since the cell A is not the neighbor of the cell 3, there is no CIO of the cell 3 relative to the cell A.
- the A cell is still a part of the 1/2 cell, belonging to the monitoring set cell, it is still necessary to configure the CIO for the A cell.
- the cell with the relatively good signal quality in the cell 1 and the cell 2 is still selected, and the cell independent offset of the cell A is the independent offset of the new cell of the cell A, and the UE is delivered. If the cell 1 signal is still better than the cell 2 signal, the independent offset of the current configuration is kept unchanged.
- the network side selects the best active set cell with the neighboring cell relationship with the A cell, and adjusts the cell independent offset corresponding to the cell A to the cell A. .
- the original best cell 1 is deleted, and the cell 2 becomes the optimal cell.
- the network side updates the CIO to 2->A and sends it to the UE.
- cell 1 is deleted, cell 3 becomes the best cell.
- the CIO needs to be configured for the A cell. Therefore, the CIO of the cell 2 is sent to the UE as the new CIO of the cell A.
- the active set cell with the best signal quality in the neighbor relationship with the A cell is the same. For example, if the cell 3 is deleted, and the cell 1 is still better than the cell 2 signal, the currently configured cell independent bias is maintained. If the cell 2 is better than the cell 1 signal, the CIO of the cell 2 is sent to the UE as the new CIO of the cell A.
- cell 1 is the optimal cell and cell A is only the neighboring cell of cell 2 and cell 3
- the signal is always selected from cells 2 and 3.
- One of them is used as a new CIO value with respect to the CIO of the cell A, and the UE is sent to evaluate the quality of the A cell.
- Support a certain monitoring set cell A only belongs to the neighboring area of a certain cell (such as cell 1) in the active set.
- the cell independent offset currently allocated to cell A is relative to cell 1.
- the active set cell When the active set cell is deleted, if the cell 1 is not deleted, the currently configured cell independent offset is kept unchanged. If cell 1 is deleted, then A does not belong to the monitoring set cell, and A is not required to configure an independent offset.
- the embodiment of the present invention sets the cell independent offset amount of the cell relative to each neighboring cell; and enables the terminal Performing measurement and evaluation according to the cell measurement result and the cell independent offset of the cell relative to each neighboring cell, and reporting the measurement report to the network side; the network side performs handover evaluation according to the measurement report, and instructs the terminal to perform cell handover according to the handover evaluation result, Thereby, the negative impact of the cell independent offset on the cell-only handover for the cell unique configuration is overcome.
- the method of the embodiment of the present invention configures a cell independent offset parameter for the neighboring cell. When the signal strength of the active centralized cell changes, the network side is independent of the cell of the neighboring cell in real time according to the change of the active centralized cell.
- the offset is adjusted; when the active set cell is deleted, the cell independent offset of the corresponding cell relative to the neighboring cell is also adjusted, thereby further ensuring the accuracy of the terminal for performing measurement and evaluation, and triggering the handover in time and avoiding The required switching improves the switching efficiency.
- the method of the embodiment of the present invention is applicable to all handover methods using cell independent offsets, including but not limited to co-frequency, inter-frequency system handover, which may be soft handover or softer handover, hard handover.
- the embodiment of the invention further provides a terminal and a network controller.
- FIG. 4 is a schematic block diagram of a terminal according to an embodiment of the present invention:
- the method includes: an independent offset amount acquiring unit 41, a measuring unit 42, a measurement evaluating unit 43, a measurement reporting unit 44, and a switching execution unit 45; and may further include: a reporting unit 46.
- the independent offset quantity obtaining unit 41 is configured to obtain, from the network side, a cell independent offset of the active set cell relative to each neighboring cell; the measuring unit 42 is configured to perform measurement on the active set cell and its neighboring area; the measurement evaluating unit 43 The measurement result is used to measure the measurement result of the measurement unit 42 and the cell independent offset of the active set cell with respect to each neighboring cell; the measurement report unit 44 is configured to report the measurement to the network side according to the measurement evaluation result of the measurement evaluation unit 43. Reporting, so that the network side sends a cell handover indication to the terminal according to the measurement report; the handover execution unit 45 is configured to perform cell handover according to the cell handover indication of the network side received by the terminal.
- the uplink unit 46 is further configured to measure the signal quality of the active centralized cell and report the signal quality to the network side after the active set cell changes, so that the network side can learn the activity according to the signal quality. Concentrating the changes of the cell, thereby adjusting the activity of the concentrated cell relative to each neighborhood The cell is independently offset, and the adjusted active set cell independent offset is sent to the terminal.
- FIG. 5 is a schematic block diagram of a network controller in an embodiment of the present invention. The method includes: an independent offset amount setting unit 51, an independent offset amount sending unit 52, and a switching indicating unit 55.
- the independent offset setting unit 51 is configured to set a cell independent offset of the active set cell relative to each of its neighboring cells, and each cell has an independent cell independent offset relative to its different neighboring cells;
- the sending unit 52 is configured to send the cell independent offset of the cell in the active set to the terminal with respect to the neighboring cell, and the terminal performs the cell measurement evaluation and reports the measurement report. For example, when the terminal initially accesses the cell, the cell is independently sent to the terminal with respect to the cell independent offset of the neighboring cell; after the terminal accesses the cell, if the active cell in the active set changes, the network controller needs The cell-independent offset of each neighboring cell is adjusted.
- the independent offset-amounting unit 52 also needs to send the adjusted cell-independent offset of the active active cell to its neighboring cell to ensure that the cell is independently offset.
- the accuracy of the cell independent offset is configured to instruct the terminal to perform cell handover according to the measurement report reported by the terminal.
- the active set cell change learning unit 53 and the independent offset adjustment unit 54 are further provided in the embodiment.
- the active set cell change learning unit 53 is configured to learn the change of the active set cell;
- the independent offset adjustment unit 54 is configured to adjust the cell independent offset of the active set cell relative to each part after the active set cell changes, and
- the adjusted active set cell independent offset is transmitted to the independent offset amount delivering unit 52. Then, the adjusted cell independent offsets are sent to the terminal by the independent offset amount issuing unit 52.
- the change of the active centralized cell may be caused by the deletion of the original cell, or may be caused by a change in the signal strength of the original cell.
- the network side may re-determine the new activity set.
- the cell may also be re-determined by the terminal side to the new cell.
- the independent offset adjustment unit 54 includes: a cell determination sub-unit 541 and an adjustment sub-unit 542.
- the cell determining sub-unit 541 is configured to determine, after the change of the active set cell, the active set cell with the best signal quality in a neighbor relationship with a certain monitoring set cell according to the signal quality of the terminal; 542, configured to determine, according to the determination result of the cell determining unit 541, a cell independent offset of the active set cell with the best signal quality relative to the monitored set cell, and transmit the independent offset of the cell to the independent offset
- the unit 52 is delivered.
- the adjustment sub-unit 542 may refer to the foregoing embodiment of the present invention. Description in the method.
- the terminal and the network controller in the embodiment of the present invention overcome the negative impact of the cell independent handover on the unique configuration of the cell for cell handover, so that the cell handover is more accurate and the user experience is better.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Selective Calling Equipment (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT07721315T ATE497683T1 (de) | 2006-07-05 | 2007-05-31 | Verfahren, netzwerksteuergerät und system zur zellübergabe |
EP20070721315 EP2037696B1 (en) | 2006-07-05 | 2007-05-31 | Cell handover method, network controller and system |
DE200760012351 DE602007012351D1 (de) | 2006-07-05 | 2007-05-31 | Verfahren, netzwerksteuergerät und system zur zellübergabe |
US12/265,702 US20090069012A1 (en) | 2006-07-05 | 2008-11-05 | Method and apparatus for cell handoff |
US13/251,773 US8498643B2 (en) | 2006-07-05 | 2011-10-03 | Method and apparatus for cell handoff |
US13/929,367 US9144001B2 (en) | 2006-07-05 | 2013-06-27 | Method and apparatus for cell handoff |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CNB200610064819XA CN100466843C (zh) | 2006-07-05 | 2006-07-05 | 一种基于小区独立偏置量的小区切换方法 |
CN200610100263.5 | 2006-07-05 |
Related Child Applications (2)
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US12/265,705 Continuation US8234552B2 (en) | 2006-07-05 | 2008-11-05 | Method and apparatus for preamble creation and communication in a wireless communication network |
US12/265,702 Continuation US20090069012A1 (en) | 2006-07-05 | 2008-11-05 | Method and apparatus for cell handoff |
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WO2008006278A1 true WO2008006278A1 (fr) | 2008-01-17 |
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Family Applications (1)
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PCT/CN2007/001742 WO2008006278A1 (fr) | 2006-07-05 | 2007-05-31 | Procédé et appareil de transfert cellulaire |
Country Status (7)
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US (3) | US20090069012A1 (zh) |
EP (1) | EP2037696B1 (zh) |
CN (2) | CN100466843C (zh) |
AT (1) | ATE497683T1 (zh) |
DE (1) | DE602007012351D1 (zh) |
RU (1) | RU2418388C2 (zh) |
WO (1) | WO2008006278A1 (zh) |
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Also Published As
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US20130286878A1 (en) | 2013-10-31 |
EP2037696B1 (en) | 2011-02-02 |
RU2418388C2 (ru) | 2011-05-10 |
DE602007012351D1 (de) | 2011-03-17 |
US20120021745A1 (en) | 2012-01-26 |
CN1878419A (zh) | 2006-12-13 |
RU2009103782A (ru) | 2010-08-10 |
CN100466843C (zh) | 2009-03-04 |
US20090069012A1 (en) | 2009-03-12 |
CN101317496A (zh) | 2008-12-03 |
ATE497683T1 (de) | 2011-02-15 |
US8498643B2 (en) | 2013-07-30 |
EP2037696A1 (en) | 2009-03-18 |
US9144001B2 (en) | 2015-09-22 |
EP2037696A4 (en) | 2009-12-02 |
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