WO2010121549A1 - Procédé et système de gestion de mobilité pour des terminaux utilisateurs le long de lignes fixes - Google Patents

Procédé et système de gestion de mobilité pour des terminaux utilisateurs le long de lignes fixes Download PDF

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Publication number
WO2010121549A1
WO2010121549A1 PCT/CN2010/072000 CN2010072000W WO2010121549A1 WO 2010121549 A1 WO2010121549 A1 WO 2010121549A1 CN 2010072000 W CN2010072000 W CN 2010072000W WO 2010121549 A1 WO2010121549 A1 WO 2010121549A1
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cell
neighboring
signal quality
current serving
received signal
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PCT/CN2010/072000
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English (en)
Chinese (zh)
Inventor
朱昀
王曼
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中兴通讯股份有限公司
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Publication of WO2010121549A1 publication Critical patent/WO2010121549A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network

Definitions

  • the present invention relates to the field of mobile communications, and in particular to a method and system for mobility management of a third generation mobile communication technology along a predetermined line (such as a high-speed railway, a highway), the mobility management including cell reselection and cell handover.
  • a predetermined line such as a high-speed railway, a highway
  • the radio access network is composed of a plurality of cellular shaped cells covering the entire land terrestrial system (PLMN). Each of the cells is covered by a radio signal transmitted by a base station node (NodeB) on the cell, and user terminals (UEs) and NodeBs in a plurality of cells are controlled and managed by a radio network controller (RNC).
  • NodeB base station node
  • UEs user terminals
  • RNC radio network controller
  • the geographic information in which the UE is located is known by the RNC, and the RNC allocates the radio resources to the NodeB and each UE, the NodeB, and each according to the information of the learned cell and the information of the UE in the cell.
  • the UE uses these radio resources to establish a radio channel and receives/transmits data on the radio channel.
  • the cell reselection (or handover) is triggered.
  • the implementation of the cell reselection follows the S criterion and the H criterion: that is, the UE first Performing S criterion determination on the received signal quality of the cell, and performing cell quality ordering on the cell satisfying the S criterion according to the H criterion. If the optimal cell ranked first is not the current serving cell, the UE will leave the current cell and camp on the cell. Optimal cell.
  • the implementation of the handover is that the UE continuously measures the received signal quality of the (current) serving cell and the neighboring cell, when It is formulated and sent to the UE. The UE will send a measurement report to the RNC, and then the RNC decides the handover according to the received measurement report, and the UE performs.
  • the conventional wireless coverage cell is a hexagonal shape in a honeycomb shape, and the high speed is high.
  • the shape of the railway is linear, and there is a big difference in the geometry between the two.
  • the second is that when the cell reselection or handover is implemented, the UE initiates measurement to signal averaging, decision, and execution, and the process needs to go through a certain period of time, which is not caused by the normal situation, and when the UE is at a high speed.
  • the call drop rate is high, and the user terminal is prone to technical problems such as disorder reselection and ping-pong effect.
  • the user terminal UE calculates the cell level value of the neighboring cell and the current serving cell, and performs reselection according to the cell level value, and the UE preferentially reselects the neighboring cell in the UE moving direction;
  • the UE When the cell handover is performed, the UE reports the received message of the neighboring cell to the radio network controller RNC.
  • the measurement report of the quality of the number the RNC preferentially switches to the neighboring cell in the direction of motion of the UE according to the direction of motion of the UE.
  • the coverage of the wireless coverage along the established line is separated from the public network by the private network;
  • the RNC configures the private network cells connected to the current private network cell along the two lines along the existing line as the neighboring cells of the current private network cell.
  • the RNC will all the geographical and current public networks.
  • the cells adjacent to the network cell are configured as neighboring cells of the current public network cell; the coverage area of the private network is a chain area along the established line.
  • the radio frequency remote technology and the different types of remote radio unit combining technologies are used to implement the chain coverage of the private network cell;
  • the radio remote technology refers to centrally placing a large-capacity baseband processing unit in a base station in a central equipment room, and using a fiber-optic connection to extend the radio frequency module in the base station to both sides of the established line;
  • the different types of remote radio unit combining technologies refer to a plurality of types of geographically connected remote radio modules covered by a plurality of remote radio modules to be classified into a logical cell by baseband processing, so that the combined logical cells are combined. Covers an area along a given line.
  • a method for the UE of the present invention to perform cell reselection is:
  • the UE continuously measures the received signal quality of the current serving cell.
  • the UE finds that the received signal quality of the current serving cell is less than the set threshold, the UE measures the received signal quality of the neighboring cell.
  • A2 The UE determines its own motion direction, and excludes the cell in the reverse motion direction from the reselected target cell range, and calculates the cell level only for the current serving cell and the neighboring cell in the UE moving direction;
  • the cell rank value of the current serving cell is: the current serving cell received signal quality value Qmeas s minus the current serving cell reselection hysteresis parameter Qhcs s ;
  • the cell rank value of the neighboring cell is: the neighboring cell receives the signal quality value Qmeas n minus the phase
  • the UE reselects to a neighboring cell that can always maintain the highest cell rank value within the set time T reselcet .
  • Another method for the UE of the present invention to perform cell reselection is:
  • the UE continuously measures the received signal quality of the current serving cell, and when the UE finds that the received signal quality of the current serving cell is less than the set threshold, the UE measures the received signal quality of the neighboring cell;
  • the RNC determines the direction of motion of the UE, and informs the UE of the direction of motion.
  • the UE calculates the cell level of the current serving cell and the neighboring cell by:
  • the cell rank value of the current serving cell is: the current serving cell received signal quality value Qmeas s minus the current serving cell reselection hysteresis parameter Qhcs s ;
  • the cell gradation value of the neighboring cell in the moving direction of the UE is: the received cell quality value of the neighboring cell
  • the cell gradation value of the neighboring cell in the direction of the reverse UE motion is: the received cell quality value Qmeas n of the neighboring cell minus the reselection hysteresis parameter Qhcs n of the neighboring cell, when the neighboring cell and the current serving cell are not in the same level, It is also necessary to subtract the offset parameter TO n of the cells between different levels;
  • the UE reselects the adjacent cell that can always maintain the highest cell rank value within the set time.
  • a method for the UE of the present invention to perform cell handover is:
  • the UE determines the direction of motion of the UE. When the UE finds that the received signal quality of the current service d, the area, and/or the neighboring cell meets the preset report triggering condition, the UE only reports the current serving cell and the motion direction.
  • the received signal quality of the neighboring cell is given to the RNC;
  • the C2 and the RNC determine that the UE is based on the measurement report of the received signal quality of the cell reported by the UE. Whether to perform handover, and if the decision is handed over, simultaneously decide which neighboring cell the UE switches to. Further, another method for the UE of the present invention to perform cell handover is:
  • the RNC determines the motion direction of the UE and excludes the adjacent cell in the reverse motion direction from the selected cell of the handover, and the RNC determines whether the UE performs handover according to the signal quality of the remaining neighboring cell and the current serving cell, and if the decision is switched, Then, it is determined which neighboring cell the UE switches to.
  • Another object of the present invention is to provide a system for managing mobility of a user terminal along a predetermined line.
  • the present invention uses the following technical solutions:
  • a system for mobility management of user terminals along a given line comprising:
  • a UE motion direction determining module configured to determine a current motion direction of the UE
  • a cell reselection module configured to perform cell reselection according to a cell gradation value of the neighboring cell and the current serving cell
  • the cell switching module is configured to perform cell handover of the neighboring cell priority in the UE moving direction according to the measurement report of the received signal quality of the neighboring cell reported by the UE and the UE moving direction output by the UE motion direction determining module.
  • an implementation manner of the cell reselection module of the present invention includes:
  • a first cell measurement module configured to: when the UE finds that the received signal quality of the current serving cell is less than a set threshold, measures the received signal quality of the neighboring cell;
  • An inverse motion direction cell exclusion module configured to exclude a neighboring cell in a reverse UE motion direction from a reselected target cell range according to a UE motion direction output by the UE motion direction determining module; and a first cell level calculation module, configured to calculate Excluding the cell level of the reselected target cell after the neighboring cell in the reverse UE motion direction;
  • the first reselection module is configured to reselect to a neighboring cell that can always maintain the highest cell rank value within a set time.
  • Another implementation manner of the cell reselection module of the present invention includes:
  • a second cell measurement module configured to: when the UE finds that the received signal quality of the current serving cell is less than a set threshold, measures the received signal quality of the neighboring cell;
  • a cell level correction calculation module configured to calculate a cell level of the current serving cell and the neighboring cell, and perform a priority on the UE moving direction according to the UE moving direction output by the UE motion direction determining module. Correction of the neighboring cell;
  • a second reselection module configured to reselect the result calculated by the cell level correction calculation module to a neighboring cell that can always maintain the cell rank value as the highest value within the set time.
  • an implementation manner of the cell switching module of the present invention includes:
  • a first measurement report reporting module configured to report, when the UE, by using the measurement, that the received signal quality of the current serving cell and/or the neighboring cell meets a preset reporting trigger condition, reporting the current serving cell and the neighboring cell in the moving direction of the UE Receiving signal quality to the first switching module;
  • the first switching module is configured to determine whether the UE performs handover according to the measurement report of the received signal quality of the cell reported by the UE, and if the handover is decided, determine which neighboring cell the UE switches to.
  • Another implementation manner of the cell switching module of the present invention includes:
  • a second measurement report reporting module configured to report the received signal quality of the current serving cell and all neighboring cells when the UE finds that the received signal quality of the current serving cell and/or the neighboring cell meets a preset reporting trigger condition by using the measurement RNC;
  • a second switching module configured to exclude the adjacent cell in the reverse motion direction from the selected cell according to the UE motion direction determined by the UE motion direction determining module, and determine the UE according to the signal quality of the remaining neighboring cell and the current serving cell. Whether to perform handover, if the handover is decided, it is simultaneously determined which neighboring cell the UE switches to.
  • the UE motion direction determining module is located at the UE end or the RNC end; the present invention separates the private network network covered by the high-speed railway from the common public network, and the private network coverage uses radio frequency remote and merges different types of RRU cells. The technology expands the coverage of each cell and adapts its cell coverage to a linear shape under the railway scene to reduce the number of cell reselections and handovers.
  • the target cell improves the accuracy of UE mobility management.
  • the invention utilizes the Doppler shift value generated when the UE moves to set parameters such as Qhcs s and Qhcs n , so that it is easier to camp in the private network cell under the high-speed motion state of the UE, thereby further improving the cell weight.
  • Figure 1 is a schematic diagram of wireless coverage along a high speed railway
  • FIG. 2 is a schematic structural diagram of a system for realizing radio frequency remoteness according to the present invention.
  • FIG. 3 is a flowchart of implementing cell reselection according to the present invention.
  • FIG. 5 is a logical structural diagram of a first cell reselection module according to the present invention.
  • FIG. 6 is a logical structural diagram of a second cell reselection module according to the present invention.
  • FIG. 7 is a logical structural diagram of a first cell switching module according to the present invention.
  • FIG. 8 is a logical structural diagram of a second cell switching module according to the present invention. detailed description
  • Figure 1 shows the different levels of cell coverage in a layered network (HCS) along a high-speed railway.
  • the layer A cell shown in shaded area
  • the layer B cell are in two different levels. The two levels overlap geographically along the high-speed railway and nearby areas; but the difference between the two is:
  • Level B is the ordinary (public network) cell level, and its target service object is that it does not move at high speed in the car, only geographically. It is advantageous for UEs in the area along the railway, whose cells are normal cellular hexagonal cells.
  • Level A is a private network cell level covering the high-speed railway.
  • the target service object is the UE moving in the car.
  • the coverage of the cell is chain-shaped coverage (that is, a single cell covers a section along the railway, and the cell and the cell are like a chain.
  • the interlocking, covering the entire area along the railway, covers the technology that enables the use of RF remote and different types of remote radio unit (RRU) combinations.
  • the radio remote control technology refers to: centrally placing a large-capacity baseband processing unit (BBU) in a base station in a central computer room, and using a fiber-optic connection to pull the radio frequency module in the base station to the far end, and each remote module is called a remote end.
  • Radio Frequency Unit RRU
  • the baseband signal is down-converted, filtered, RF filtered, and sent to the antenna feed line after the linear power amplifier.
  • the UE uplink signal received by the uplink is filtered, low-noise amplified, RF small-signal amplification and down-converted, and then analog-to-digital conversion and digital intermediate frequency processing are performed and sent to the baseband unit.
  • the connection between the RRU and the BBU may be a Common Public Radio Interface (CPRI) or an Open Base Station Architecture (OBASI).
  • CPRI Common Public Radio Interface
  • OBASI Open Base Station Architecture
  • the remote RRU unit along the high-speed railway is arranged on both sides of the railway line, so its wireless signal covers the railway line and both sides; at the same time, multiple types, but geographically
  • the connected RRU cell (the RRU cell refers to the area covered by one RRU unit) is classified into a logical cell by means of baseband processing (the logical cell refers to a set of baseband resources corresponding to one carrier frequency and its coverage in the base station node). region).
  • RRU cells may have different geographical scenarios, such as a common plain environment, a tunnel environment, and a tunnel portion of a high-speed rail, a curved portion of a railroad, and the like.
  • the number of merged RRUs is only in the range of the number of baseband resources supported on the BBU baseband board, and the merge manner is any combination. Therefore, the merged logical cell covers a section of the railway along the line, and the cells are linked to each other to achieve linear coverage.
  • the hierarchical cells of two different levels (dedicated network level A and public network level B) are wirelessly overlapped along the high-speed railway and its vicinity.
  • the technical problem to be solved by the present invention is: how to make these UEs stay in the private network cell as much as possible; and how to perform more efficient mobility management for these UEs, Specifically, how to enable these UEs to achieve accurate and efficient cell reselection or handover.
  • the cell list is optimized by the RNC to enable the UE to camp in the private network cell as much as possible:
  • the RNC sets the neighbor cell list: For a cell whose geographic location is a station, when the RNC configures its neighbor cell list, the RNC and the public network cell are mutually configured into adjacent cells; for the non-station location cell, the RNC is When configuring the neighbor cell list of the private network cell, the cell is configured as a neighboring cell along the two adjacent dedicated network cells along the railway line; when the RNC configures the neighbor cell list of the public network cell, according to the prior art All geographically adjacent cells join the list. Further, after configuring the neighbor cell list of each cell, the RNC sends the system message (SIB) on the cell broadcast channel (BCH) to all UEs in the cell.
  • SIB system message
  • BCH cell broadcast channel
  • the optimization setting of the foregoing neighbor cell list is aimed at narrowing the cell range to be reselected by the UE in the non-station private network cell, reducing the number of reselection measurements, and avoiding the disordered reselection (and handover) of the possible lateral cells.
  • the excluded cells are geographically adjacent public network cells, and other adjacent private network cells such as railroad crossings or merging.
  • FIG. 3 The process of cell reselection of the present invention is shown in FIG. 3, and the specific contents are as follows:
  • Step 301 The UE periodically, or triggered by an event, measures the received signal quality of the current serving cell.
  • Step 302 If the UE finds that the received signal quality value of the current serving cell is lower than a certain threshold, that is, whether the S criterion is met, if it is satisfied, the measurement of the received signal quality of the neighboring cell is started, and step 303 is performed; otherwise, Step 301; Step 303: The UE calculates the cell level H value of the neighboring cell with the received signal quality value of the cell in the neighboring cell that is greater than the set threshold, and sorts the obtained H value, and searches for the obtained H value. The highest ranked cell (called H criterion;);
  • the UE determines the direction of motion of the UE, and excludes the cell in the direction of the reverse motion from the range of the target cell to be reselected, and only moves the current serving cell and the UE.
  • the neighboring cell in the direction calculates the cell level H, and the calculation manner is as follows:
  • the subscript s represents the current serving cell
  • n represents the neighboring cell.
  • Qmeas is the received signal quality value obtained by the measurement
  • Qhcs s and Qhcs n are the reselection hysteresis parameters of the current serving cell and the reselection hysteresis parameters of the neighboring cells, respectively.
  • TO n is an offset parameter of a cell between different levels.
  • judging the direction of motion of the UE for example, it can be judged by the positive or negative of the Doppler frequency offset (fd) of the UE, that is, if the Doppler frequency offset is positive, the UE moves toward the NodeB.
  • the Doppler frequency offset is negative, the UE is moving away from the NodeB; it may also be determined according to the change of the timing advance (TA) of the corresponding cell base station measured by the UE, that is, when the TA decreases, the UE moves toward the NodeB, TA When increasing, the UE is moving away from the NodeB.
  • TA timing advance
  • the RNC determines the motion direction of multiple UEs in the cell.
  • the NodeB first needs to report the Doppler shift value or the TA value of the UE to the RNC, and then The direction of motion of each UE is judged by the RNC, and the RNC then informs the UE of the direction of motion.
  • the RNC can determine the motion direction of most UEs. As the direction of motion of all UEs, this improves the accuracy of the judgment.
  • the cell rank value of the neighboring cell in the direction of motion of the UE is:
  • H n Qmeas n +Qhcs n - TO n *Ln
  • the cell level value of the neighboring cell in the direction of the reverse UE motion is:
  • H n Qmeas n -Qhcs n - TO n *Ln
  • the neighboring cell level in the moving direction is easily higher than the neighboring cell in the reverse moving direction, so the UE will reselect to the correct cell.
  • Step 304 it is determined whether a cell can always maintain the cell rank value is the highest in the set time (T reselect ), if yes, step 305 is performed; otherwise, step 303 is performed;
  • Step 305 UE reselects to the fixed time (T reselect) the cell remains within the cell with the highest level value.
  • the present invention respectively provides an implementation structure diagram of two cell reselection modules as shown in FIG. 5 and FIG. 6, and in FIG. 5, the first cell measurement module measures the received signal quality of the cell and outputs the same.
  • the reverse motion direction cell exclusion module the reverse motion direction cell exclusion module excludes the adjacent cell in the reverse UE motion direction from the selected cell according to the UE motion direction determination result output by the UE motion direction determination module located at the UE end, and then
  • the first cell level calculation module performs level calculation on the selected cell, and the first reselection module reselects to the cell with the highest rank according to the result of the first cell level calculation module.
  • the UE motion direction determining module is located at the RNC end, and the RNC performs comprehensive judgment according to the data reported by each UE, and obtains an accurate value of the UE motion direction and notifies the UE.
  • the cell level correction module in this embodiment performs a correction calculation on the calculation formula of the cell level according to the determination result of the UE motion direction, so that the second reselection module can preferentially reselect the cell in the UE motion direction.
  • Step 401 The NodeB measures the Doppler frequency shift value of each UE and reports it to the RNC.
  • the RNC sets The triggering condition of the measurement report is reported by the UE, and is sent to the UE;
  • Step 402 The UE continuously measures the received signal quality of the current serving cell and the neighboring cell.
  • Step 403 when the UE finds that the signal quality of a certain cell meets the preset trigger condition, step 404 is performed; otherwise, step 402 is performed;
  • Step 404 The measurement result of the received signal quality value of the current serving cell and/or the neighboring cell is reported to the RNC as a measurement report.
  • the UE determines the direction of its own motion, and the UE finds that the received signal quality of the current serving cell and/or the neighboring cell meets the preset cell by measurement. Receiving the signal quality reporting trigger condition, only reporting the received signal quality of the neighboring cell in the current serving cell and the moving direction to the RNC;
  • the triggering condition is similar to the S criterion of the cell reselection, that is, the RNC pre-sets and sends the threshold to the UE. If the measurement result of the UE occurs, the signal quality of a certain cell exceeds the threshold or the timing time. If the signal quality of the neighboring cell is better than that of the current serving cell, the signal quality of the cell is reported to the RNC;
  • Step 405 The RNC determines, according to the measurement report reported by the UE, whether the UE performs handover, and which neighboring cell to switch to.
  • the RNC determines the direction of motion of the UE, because a single UE may appear to determine that the direction of motion is wrong, and the RNC may obtain multiple trains in the same train.
  • the motion direction information of the UE in the whole reduces the possibility of such a judgment error as a whole.
  • the UE reports the received signal quality value of the cell that meets the preset trigger condition to the RNC, and the RNC excludes the adjacent cell in the reverse motion direction from the target cell of the handover, and the RNC switches according to the handover.
  • the received signal quality of the target cell determines whether the UE performs handover.
  • the first measurement report reporting module at the UE end in FIG. 7 reports only the measurement report of the received signal quality of the neighboring cell in the moving direction of the UE according to the judgment result of the UE moving direction determining module at the UE end, so that the first switching at the RNC end is performed.
  • the module can preferentially switch to neighboring cells in the direction of UE motion.
  • the embodiment shown in FIG. 8 is different from the corresponding embodiment in FIG.
  • the UE motion direction determining module is located at the RNC end, and the second measurement report reporting module located at the UE end does not perform the exclusion operation on the reverse motion direction cell, as long as the trigger condition is met. All the neighboring cells will be reported to the second handover module, and the second handover module excludes the adjacent cells in the reverse motion direction from the target cell of the handover according to the judgment result of the UE motion direction judgment module, thereby playing the RNC to judge the UE motion.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention porte sur un procédé et un système de gestion de mobilité pour des terminaux utilisateurs le long de lignes fixes, résolvant le problème technique selon lequel la gestion de mobilité est difficile lorsque les terminaux utilisateurs le long de lignes fixes sont dans un état de mouvement à haute vitesse. Dans la présente invention, lorsqu'une re-sélection de cellule ou un transfert intercellulaire est effectué, la direction de mouvement de l'équipement utilisateur (UE) est évaluée et l'équipement utilisateur commute de préférence sur la cellule adjacente ou re-sélectionne celle-ci dans la direction de mouvement de l'UE, permettant ainsi à l'UE dans l'état de mouvement à haute vitesse de tendre à demeurer dans la cellule de réseau privé, et améliorant davantage la précision et l'efficacité de la re-sélection de cellule et du transfert intercellulaire. Dans la présente invention, une liste de cellules adjacentes appropriées est établie, réduisant ainsi des temps de mesure inutiles, évitant une re-sélection et une commutation sur des cellules latérales sans ordre, et améliorant l'efficacité de la gestion de mobilité pour l'UE.
PCT/CN2010/072000 2009-04-24 2010-04-21 Procédé et système de gestion de mobilité pour des terminaux utilisateurs le long de lignes fixes WO2010121549A1 (fr)

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CN107454637A (zh) * 2017-07-28 2017-12-08 努比亚技术有限公司 小区切换方法、移动终端及计算机可读存储介质
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