Switching controlling method in mobile communication system and wireless network controller

[0054] In order to make the technical problems, technical solutions, and advantages to be solved by the embodiments of the present invention clearer, a detailed description will be given below in conjunction with the drawings and specific embodiments.

[0055] figure 1 It is a schematic flowchart of a handover control method in a mobile communication system according to an embodiment of the present invention. Such as figure 1 , The method of this embodiment includes the following steps:

[0056] Step 101: The radio network controller determines the measurement quantity to be measured and the handover measurement in the current terminal measurement management state according to the corresponding relationship between the preset terminal measurement management state and the measurement quantity to be measured and the switching measurement control parameter Control parameters;

[0057] Step 102: The radio network controller delivers a measurement control message to the mobile terminal and/or base station, where the measurement control message includes the determined measurement quantity to be measured;

[0058] Step 103: The radio network controller receives measurement data measured and reported by the mobile terminal and/or base station according to the measurement quantity to be measured included in the measurement control message;

[0059] Step 104: The radio network controller triggers a cell handover when the measurement data reported by at least one of the mobile terminal and the base station meets the handover decision condition determined by the handover measurement control parameter.

[0060] In the embodiment of the present invention, multiple terminal measurement management states (UMMS, UE Measurement Management Status) are set, and in different terminal measurement management states, that is, the UMM state, the measurement quantity corresponding to the terminal measurement management state and the switching measurement control parameters are adopted, This enables the network side such as the wireless network controller to monitor different measurement data reported by the terminal and/or base station, and configure multiple sets of handover measurement control parameters, so that different handover measurement control parameters can be configured for different terminal measurement management states, using different The handover decision strategy of this technology realizes the precise control of handover and avoids various problems such as dragging and dropped calls caused by inaccurate handover caused by the single handover decision strategy of the prior art.

[0061] Preferably, in the handover control method, the handover measurement control parameters include: a neighbor cell list to be measured; the measurement control message sent by the network side further includes: handover measurement control parameters; and the step 102 After that, before step 103, it also includes:

[0062] The terminal and/or base station measures the neighboring cells included in the neighboring cell list according to the measurement quantity to be measured included in the measurement control message, obtains measurement data, and reports it.

[0063] Preferably, the aforementioned measurement quantities to be measured and handover measurement control parameters corresponding to different terminal measurement management states are different.

[0064] Preferably, after the network side, such as the radio network controller, receives the measurement data measured and reported by the mobile terminal and/or base station, it further includes: the radio network controller’s measurement data of at least one of the mobile terminal and the base station satisfies the terminal measurement When the trigger condition of the state change is managed, the current terminal measurement management state of the terminal is changed to the terminal measurement management state corresponding to the trigger condition. After the terminal measurement management state is changed, the network side, such as a radio network controller, issues measurement control messages and performs switching control according to the measurement values ​​and switching measurement control parameters corresponding to the changed terminal measurement management state.

[0065] In the embodiment of the present invention, the network side changes the current terminal measurement management state to the terminal measurement management state corresponding to the trigger condition when the measurement data reported by the terminal and/or the base station meets the trigger condition of the measurement management state of other terminals. Realize the monitoring of different measurement data reported by the terminal and/or base station, analyze and determine the measurement management status of the terminal according to the measurement result, dynamically adjust the measurement volume and switch the measurement control parameters according to the measurement management status of the different terminal, and issue new measurement control messages, thereby Can realize more precise switching control. Exemplarily, the handover measurement control parameters include: a list of neighboring cells to be measured and handover decision parameters, where the handover decision parameters include: handover thresholds such as handover hysteresis and cell-by-cell handover thresholds, handover trigger time, filter coefficients, etc., all of which are The algorithm parameters specified by the existing international standards for mobile communications.

[0066] Preferably, the trigger condition for the above-mentioned terminal measurement management state is preset on the network side.

[0067] The embodiment of the present invention improves the measurement control method in the handover process, and introduces the terminal measurement management state, which can be set according to the mobile characteristics of the terminal, the amount of data transmission, and/or the wireless signal level and quality. Various terminal measurement management status.

[0068] Preferably, in the handover control method of the embodiment of the present invention, after the terminal obtains the measurement data by measuring, the method further includes:

[0069] When the terminal determines that the measurement data meets the handover decision condition determined according to the handover measurement control parameter, the terminal notifies the network side to trigger the cell handover.

[0070] In the embodiment of the present invention, both the terminal and the network side can trigger the handover decision, whichever is triggered first.

[0071] figure 2 It is a schematic flowchart of a handover control method according to another embodiment of the present invention. Such as figure 2 , The method of this embodiment includes:

[0072] Step 201: The network side, such as the radio network controller, sends a measurement control message according to the current measurement management state of the terminal. The measurement control message includes: the measurement quantity to be measured and the switching measurement control parameter;

[0073] Step 202: The terminal performs data measurement according to the measurement control message, and reports the measurement data;

[0074] After the terminal reports the measurement data, the radio network controller judges whether the handover trigger condition is met according to the measurement data on the one hand, that is, executes step 203; on the other hand, judges whether to trigger the change of the terminal measurement management state condition, that is, executes step 206;

[0075] Step 203: The network side judges whether the measurement data reported by the terminal meets the handover trigger condition corresponding to the handover decision strategy in the current terminal measurement management state; if so, go to step 204; otherwise, go to step 202;

[0076] Step 204: The network side selects a target cell according to the measurement data reported by the terminal;

[0077] Step 205: The terminal issues a handover command, executes the handover, and ends the process.

[0078] Step 206: The network side judges whether the measurement data meets the trigger condition of the terminal measurement state change; for example, it judges whether the measurement data of the terminal meets at least one trigger condition of the terminal measurement management state except the current terminal measurement management state ; If yes, go to step 207; otherwise, go to step 202;

[0079] Step 207: The terminal changes the current terminal measurement management state to the terminal measurement management state corresponding to the trigger condition, and then proceeds to step 201.

[0080] In the embodiment of the present invention, under the initial condition, the UMM state is set as the initial state, and a default state can be preset as the initial state. The initial state may be any terminal measurement management state, or a collection of multiple terminal measurement management states.

[0081] The implementation of the embodiments of the present invention will be described in detail below.

[0082] In the technical solution of the embodiment of the present invention, the network side sets a series of terminal measurement management states, and each state has a corresponding switching judgment strategy. The mobile communication network can set the corresponding terminal measurement management state trigger condition, that is, the trigger rule, based on certain measurement quantities and parameters for each terminal measurement management state. image 3 Shown. image 3 The corresponding meaning of each data is as follows:

[0083] A1, A2, ... An: for the n measurement quantities of the terminal measurement management state A, n is a natural number;

[0084] FA(x): Trigger condition for terminal measurement management state A;

[0085] Xa, Ya, Za...: Trigger parameters for the terminal measurement management state A.

[0086] When a mobile communication terminal initiates a service, the network side can instruct the terminal to measure the corresponding measurement quantity. Taking state A as an example: the network side can instruct the terminal to measure a series of measurement quantities such as A1, A2, ... An, and when the terminal The reported measurement value is when the measurement data meets the state trigger condition and the expression specified by the state trigger parameter (Xa, Ya, Za...), namely:

[0087] FA(A1, A2,……An, Xa, Ya, Za……)=True

[0088] Then it is judged that the terminal is in the UMM state A, in this case, the UMM state of the terminal is not the A state, and it is changed to the A state.

[0089] The terminal measurement management state measurement quantity involved in the embodiment of the present invention includes but is not limited to the measurement quantity in the following fields: distance measurement; time measurement; level measurement; quality measurement; signal-to-noise ratio measurement; data throughput measurement; base station/terminal power measurement ; Frequency measurement, etc.

[0090] The embodiments of the present invention exemplarily provide the following UMM states that are set according to the mobile characteristics of the terminal, the amount of data transmission, the wireless signal level and the quality and other conditions, and the measured quantities that need to be reported to determine whether they are in the corresponding UMM state, and the corresponding UMM State trigger conditions and switching strategies.

[0091] 1. UMM status related to the distance between the terminal and the base station: cross-area coverage status and non-cross-area coverage status. Among them, the over-area coverage (OOD) state refers to the state when the terminal has entered the reasonable coverage of other cells, but no handover occurs; the non-over-area coverage (NOD) state refers to the reasonable coverage of the terminal in the serving cell The state within the time.

[0092] To determine whether the terminal is in the above-mentioned distance-related UMM state, the measurement quantity that the terminal needs to measure includes at least one of the following:

[0093] Time advance (Tadv): the time difference between the mobile communication terminal sending a wireless signal and the mobile communication base station receiving the wireless signal; or the mobile communication base station sending a wireless signal, and the mobile communication terminal receiving the wireless signal The time difference; the specific calculation formula is:

[0094] TADV=TRX-TTX

[0095] GPS Difference: The distance between the terminal and the base station calculated based on the longitude and latitude of the mobile communication terminal and the longitude and latitude of the mobile communication base station (the terminal needs to be built-in GPS), the specific calculation formula is:

[0096] DGPS=2R*arcsin(sqrt(0.5*(1-sinα1*sinα2-cosα1*cosα2*cos(β2-β1))))

[0097] Among them, α1, α2 are the latitudes of the two points; β1, β2 are the longitudes of the two points, and R is the radius of the earth.

[0098] The distance-related state trigger conditions are:

[0099] Trigger conditions for cross-area coverage status:

[0100] In the predetermined first continuous time period T1, the time advance or the latitude and longitude difference is always greater than or equal to the predetermined first time advance threshold or the first latitude and longitude threshold; that is, in the predetermined first continuous time period T1, the time advance The amount is always greater than or equal to the predetermined first timing advance threshold; or within the predetermined first continuous time period T1, the latitude and longitude difference is always greater than or equal to the predetermined first latitude and longitude threshold;

[0101] Trigger conditions for non-cross-area coverage status:

[0102] In the predetermined second continuous time period, the timing advance or the latitude and longitude difference is always smaller than the predetermined second timing advance threshold or the second latitude and longitude difference threshold.

[0103] Exemplarily, the handover measurement control parameters in the cross-area coverage state include: neighbor cell measurement and handover decision parameters, and the setting strategy includes:

[0104] Neighboring cell configuration: increase the number of neighboring cells;

[0105] Handover threshold setting: The neighboring cell handover threshold configuration is gradually increased from near to far according to the distance between the target cell and the source cell, and finely optimized cell by cell according to the wireless environment;

[0106] Handover trigger time configuration: The handover trigger time is short, and it is finely optimized according to the wireless environment;

[0107] Filter coefficient configuration: The filter coefficient is low and finely optimized according to the wireless environment.

[0108] And in the cross-area coverage state, the terminal can be forced to initiate a handover to a specific neighboring cell.

[0109] The handover measurement control parameter setting strategy in the non-cross-area coverage state includes:

[0110] Neighboring cell configuration: the number of neighboring cells is small, and only the neighboring cells that are close to the source cell are configured;

[0111] Handover threshold setting: Neighbor cell handover threshold is optimized cell by cell according to the wireless environment;

[0112] Handover trigger time configuration: The handover trigger time is longer, and it is finely optimized according to the wireless environment;

[0113] Filter coefficient configuration: The filter coefficient is high, and it is finely optimized according to the wireless environment.

[0114] According to the above-mentioned different handover decision strategies adopted for the cross-area coverage state and the non-cross-area coverage state, in the case of non-cross-area coverage, the terminal only needs to measure a small number of neighboring cells in the inner layer, which improves the measurement accuracy of neighboring cells; In the case of cross-cell coverage, the terminal measures a large area of ​​neighboring cells, and can quickly switch to the correct neighboring cell to avoid dragging and dropping calls due to driving out of the serving cell and neighboring cell coverage area. Thereby, the accuracy of the terminal handover is improved.

[0115] 2. The UMM state related to the terminal location, including: still state (Still): the terminal is in a static state; low-speed movement state (LSM): the terminal is in a low-speed movement state; high-speed movement state (HSM): the terminal is in a high-speed movement state;

[0116] To determine whether the terminal is in the UMM state related to the above-mentioned terminal location, the measurement quantity that the terminal needs to measure includes at least one of the following:

[0117] Switching frequency: in continuous time T P , The number of times the terminal has switched;

[0118] Moving speed: the moving speed of the mobile communication terminal, in this case the terminal needs to support GPS;

[0119] Terminal latitude and longitude: mobile communication terminal latitude and longitude, in this case the terminal needs to support GPS;

[0120] Time advance (Tadv): The time difference between the mobile communication terminal sending a wireless signal and the mobile communication base station receiving the wireless signal; or the mobile communication base station sending a wireless signal, and the mobile communication terminal receiving the wireless signal. Time difference;

[0121] Camping cell: the serving cell where the terminal currently camps.

[0122] The trigger condition of the static state includes at least one of the following conditions:

[0123] 1) When judging based on the switching frequency, the trigger condition is that the switching frequency is lower than the predetermined first switching frequency threshold;

[0124] 2) When judging according to the latitude and longitude of the terminal, the trigger condition is: set a time period value T G ,Calculate the terminal latitude and longitude average L in each time period Gn , In consecutive N1 (first number) time periods (T G ×N1), L Gn And L Gn The difference between the minimum values ​​is lower than the predetermined terminal latitude and longitude average difference threshold, or L Gn The variance of is lower than the predetermined latitude and longitude average variance threshold;

[0125] 3) When judging based on the cell where the terminal resides, the trigger condition is: preset a cell set Scell ​​where the terminal resides, and within a predetermined continuous time Ts (third continuous time period), the serving cell where the terminal resides All fall into the collection;

[0126] 4) When judging according to the time advance, the trigger condition is to set a time period value T A ,Calculate the average value T of Tadv in each time period AAn , In consecutive N2 (second number) time periods (T A ×N2), T AAn The difference between the maximum value and its minimum value is lower than the predetermined time advance average difference threshold, or L An The variance of is lower than the average variance threshold of the time advance;

[0127] The high-speed movement state includes at least one of the following trigger conditions:

[0128] 1) When judging based on the switching frequency, the trigger condition is that the switching frequency is higher than the second switching frequency threshold;

[0129] 2) When judging based on the terminal moving speed, the trigger condition is: in a predetermined continuous time period, such as the fourth continuous time period, the mathematical expectation of the terminal moving speed is higher than the predetermined first mathematical expectation threshold;

[0130] The trigger condition of the low-speed movement state includes at least one of the following conditions:

[0131] 1) When judging based on the switching frequency, the trigger condition is that the switching frequency is between the static state threshold and the high-speed movement threshold, that is, between the first switching frequency threshold and the second switching frequency threshold;

[0132] 2) When judging according to the moving speed of the terminal, the triggering condition is: within a predetermined continuous period of time (the fifth continuous time period), the mathematical expectation of the terminal moving speed is lower than the predetermined second mathematical expectation threshold and greater than zero;

[0133] Exemplarily, the handover measurement control parameters in the cross-area coverage state include: neighbor cell measurement and handover decision parameters, and the setting strategy includes:

[0134] Neighboring cell configuration: a small number of neighboring cells;

[0135] Handover threshold setting: The neighboring cell handover threshold is configured to be higher, and it is finely optimized according to the wireless environment;

[0136] Handover trigger time configuration: The handover trigger time is longer, and it is finely optimized according to the wireless environment;

[0137] Filter coefficient configuration: The filter coefficient is high, and it is finely optimized according to the wireless environment;

[0138] Handover control parameter setting strategies under low-speed movement include:

[0139] Neighboring cell configuration: a small number of neighboring cells;

[0140] Handover threshold setting: Neighbor cell handover threshold is optimized cell by cell according to the wireless environment;

[0141] Handover trigger time configuration: The handover trigger time is longer, and it is finely optimized according to the wireless environment;

[0142] Filter coefficient configuration: The filter coefficient is high, and it is finely optimized according to the wireless environment.

[0143] Compulsory handover can also be set in the low-speed mobile state, that is, the terminal can be forced to initiate handover to a specific neighboring cell;

[0144] The switching measurement control parameter setting strategy under high-speed movement includes:

[0145] Neighboring area configuration: the number of adjacent areas is large;

[0146] Handover threshold setting: The neighboring cell handover threshold configuration is gradually increased from near to far according to the distance between the target cell and the source cell, and finely optimized cell by cell according to the wireless environment;

[0147] Handover trigger time configuration: The handover trigger time is short, and it is finely optimized according to the wireless environment;

[0148] Filter coefficient configuration: The filter coefficient is low and finely optimized according to the wireless environment.

[0149] A forced handover can also be set in the high-speed mobile state, that is, the terminal can be forced to initiate a handover to a specific neighboring cell.

[0150] According to the different handover decision strategies adopted in the static state, low-speed moving state and high-speed moving state, the number of handovers can be reduced in the static and low-speed state, avoiding the increase of terminal and network signaling load due to frequent switching, and controlling the terminal station. Stay in the cell to achieve accurate traffic load sharing; it can quickly switch to the correct neighboring cell at high speed to avoid dragging dropped calls due to driving out of the serving cell and neighboring cell coverage area, thereby improving the handover accuracy.

[0151] 3. UMM status related to terminal reception level, including: good coverage state (InC), that is, the state when the terminal is in a good coverage area; weak coverage state (LoC), that is, the state when the terminal is in a weak coverage area; deep fading state (DFC), the state when the terminal is in a deep fading area;

[0152] To determine whether the terminal is in the UMM state related to the above-mentioned terminal reception level, the measurement quantity that the terminal needs to measure includes at least one of the following:

[0153] Common control channel reference level: the mobile communication base station pilot channel and broadcast channel received by the terminal, such as GSM network BCCH RSSI, WCDMA network CPICH RSCP, TD-SCDMA network PCCPCH RSCP, etc.;

[0154] Service channel level: the level of the service channel received by the terminal;

[0155] The trigger conditions for the good coverage state (InC) include: during a continuous period of time, that is, the predetermined sixth continuous period of time T RC Inside, the reference level of the common control channel or the service channel level received by the terminal is higher than the first level threshold;

[0156] The trigger conditions of the weak coverage state (LoC) include: a predetermined period of time T RC In (the seventh continuous time period), the reference level of the common control channel or the service channel level received by the terminal is lower than the second level threshold;

[0157] The deep fading state (DFC) trigger conditions include: examining a predetermined continuous time T RD (Eighth continuous time period), the common control channel reference level or traffic channel level received by the terminal, if the last measured value of the received level minus T RD The difference after the maximum value within is a negative number and is lower than a predetermined level difference threshold, it is judged as a deep fading state.

[0158] The setting strategy of switching measurement control parameters in the good coverage state includes:

[0159] Handover trigger time configuration: The handover trigger time is longer, and it is finely optimized according to the wireless environment;

[0160] Filter coefficient configuration: The filter coefficient is high, and it is finely optimized according to the wireless environment;

[0161] Neighbor cell measurement and handover parameter strategy in weak coverage state;

[0162] Neighboring cell configuration: the number of neighboring cells increases moderately, and the neighboring cells between systems are configured;

[0163] Handover threshold setting: The neighboring cell handover threshold is finely optimized cell by cell according to the wireless environment, and the inter-system handover threshold is moderately reduced to prompt the terminal to switch to a stronger different system network.

[0164] Compulsory handover can be set in the good coverage state, that is, the terminal can be forced to initiate handover to a specific neighboring cell;

[0165] The setting strategy of switching measurement control parameters in the deep fading state includes:

[0166] Handover threshold setting: The neighboring cell handover threshold is higher, and it is finely optimized according to the wireless environment;

[0167] Handover trigger time configuration: The handover trigger time is short, and it is finely optimized according to the wireless environment;

[0168] Filter coefficient configuration: The filter coefficient is low and finely optimized according to the wireless environment.

[0169] According to the different handover decision strategies adopted in the good coverage state, weak coverage state, and deep fading state, the number of handovers can be reduced in the good coverage state to avoid the increase in terminal and network signaling load caused by frequent handoffs; in the weak coverage state It can actively switch to other neighboring cells of the system or other mobile communication systems to avoid weak coverage drop; in the deep fading state, it can quickly switch to other neighboring cells to avoid dropped calls, thereby improving the handover accuracy.

[0170] In the embodiment of the present invention, the uplink and downlink quality, uplink and downlink interference, uplink and downlink signal-to-noise ratio and data throughput need to be tested by the terminal and the base station, the terminal tests the downlink, and the base station tests the uplink.

[0171] 4. Status related to the uplink and downlink quality, including: Deteriorated Quality (LoQ), that is, when the uplink and downlink quality is degraded, and the block error rate is high; Normal Quality Status (NoQ), that is, the state when the uplink and downlink quality is normal;

[0172] To determine whether the terminal is in the UMM state related to the above-mentioned uplink and downlink quality-related states, the terminal or the measurement quantities that need to be measured include:

[0173] Block error rate: The ratio of the number of CRC error packets received by the terminal or base station to the total number of data packets within a period of time;

[0174] The trigger condition of the degraded quality (LoQ) includes at least one of the following conditions:

[0175] In a predetermined continuous time period (the ninth continuous time period), the block error rate of the data packet received by the terminal is higher than the predetermined first block error rate threshold;

[0176] In the predetermined eleventh continuous time period (the eleventh continuous time period), the block error rate of the data packet received by the base station is higher than the predetermined third block error rate threshold;

[0177] The trigger condition of the normal state of quality (NoQ) includes at least one of the following conditions:

[0178] During a predetermined continuous time T Q In the (tenth continuous time period), the block error rate of the data packet received by the terminal is lower than the predetermined first block error rate threshold;

[0179] In a predetermined continuous time period (twelfth continuous time period), the block error rate of the data packet received by the base station is lower than the predetermined fourth block error rate threshold.

[0180] The setting strategy of handover measurement control parameters in the state of quality deterioration includes:

[0181] Handover threshold setting: The neighbor cell handover threshold is low, and the cell-by-cell fine optimization is performed according to the wireless environment, and the inter-system handover threshold can be appropriately lowered according to the wireless environment;

[0182] Handover trigger time configuration: The handover trigger time is short, and it is finely optimized according to the wireless environment;

[0183] Filter coefficient configuration: The filter coefficient is low and finely optimized according to the wireless environment.

[0184] When the quality is deteriorated, a forced handover is set, that is, the terminal can be forced to initiate a handover to a specific neighboring cell, such as a handover to a neighboring cell of a different frequency or system;

[0185] Under normal quality conditions, there are no specific requirements for handover measurement control parameters, such as neighbor cell measurement and handover decision parameters, and fine optimization is performed according to the wireless environment.

[0186] According to the above-mentioned different handover decision strategies adopted in the quality deterioration state and the quality normal state, it is possible to quickly switch to other neighboring cells of the system or other mobile communication systems when the quality is deteriorated, avoiding call drops and improving the handover accuracy.

[0187] 5. UMM status related to uplink and downlink interference includes:

[0188] High Interference State (HiI): The state when the uplink and downlink interference is high;

[0189] Low interference state (LoI): Low uplink and downlink interference;

[0190] To determine whether the terminal is in the UMM state related to the above-mentioned uplink and downlink interference related state, the measurement quantities that the terminal or base station needs to measure include:

[0191] Interference level: the uplink and downlink interference level measured by the mobile communication base station or mobile communication terminal on the carrier where the mobile communication terminal works;

[0192] The trigger condition of the high interference state (HiI) includes at least one of the following conditions:

[0193] In a predetermined continuous period of time (the thirteenth continuous period of time), the downlink time slot interference level measured by the terminal is higher than the first interference level threshold;

[0194] In a predetermined continuous time period (fifteenth continuous time period), the uplink time slot interference level measured by the base station is higher than the predetermined third interference level threshold;

[0195] The trigger condition of the low interference state (LoI) includes at least one of the following conditions:

[0196] In a predetermined period of continuous time (fourteenth continuous period of time), the downlink time slot interference level measured by the terminal is lower than the predetermined second interference level threshold;

[0197] In a predetermined continuous time period (sixteenth continuous time period), the uplink time slot interference level measured by the base station is lower than the predetermined fourth interference level threshold.

[0198] The thirteenth, fourteenth, fifteenth, and sixteenth consecutive time periods mentioned above can be the same as T I..

[0199] The setting strategy of handover measurement and control control parameters under high interference state includes:

[0200] Handover threshold setting: The neighbor cell handover threshold is low, and the cell-by-cell fine optimization is performed according to the wireless environment, and the inter-system handover threshold can be appropriately lowered according to the wireless environment;

[0201] Handover trigger time configuration: The handover trigger time is short, and it is finely optimized according to the wireless environment;

[0202] Filter coefficient configuration: The filter coefficient is low and finely optimized according to the wireless environment.

[0203] Set forced handover in high interference state, you can force the terminal to initiate handover to specific neighboring cells, such as neighboring cells of different frequencies and systems;

[0204] In the low-interference state, there are no specific requirements for the settings of handover measurement control parameters, neighbor cell measurement and handover parameters, and fine optimization is made according to the wireless environment.

[0205] According to the above-mentioned different handover decision strategies for high-interference and low-interference states, it is possible to quickly switch to other neighboring cells of the system or other mobile communication systems when high interference occurs, avoiding call drops, and improving the handover accuracy.

[0206] 6. UMM status related to uplink and downlink signal-to-noise ratio, including:

[0207] Deteriorating signal-to-noise ratio (LoCI): Low uplink and downlink signal-to-noise ratio;

[0208] Normal signal-to-noise ratio (HiCI): The uplink and downlink signal-to-noise ratio is high;

[0209] To determine whether the terminal is in the UMM state related to the above-mentioned uplink and downlink signal-to-noise ratio, the measurement quantity that the terminal needs to measure includes at least the following:

[0210] Common control channel reference signal-to-noise ratio: the signal-to-noise ratio of the pilot channel and broadcast channel of the mobile communication base station received by the terminal, such as WCDMA network CPICH C/I, TD-SCDMA network PCCPCH C/I, etc.;

[0211] Service channel signal-to-noise ratio: uplink and downlink service channel SIR, such as the SIR value of WCDMA network and TD_SCDMA network.

[0212] The triggering condition of the degraded signal-to-noise ratio (LoCI) state includes: in a predetermined continuous time period (the seventeenth continuous time period), the reference signal-to-noise ratio of the common control channel or the traffic channel signal-to-noise ratio is lower than the predetermined first signal-to-noise ratio Ratio threshold

[0213] Normal state of signal-to-noise ratio (HiCI) trigger condition: in a predetermined continuous time (the eighteenth continuous time period), the common control channel reference signal-to-noise ratio or traffic channel signal-to-noise ratio is higher than the predetermined second signal-to-noise ratio threshold .

[0214] The above-mentioned predetermined seventeenth continuous time period and the eighteenth continuous time period may be the same as the time period T CI , The above-mentioned first signal-to-noise ratio threshold and the second signal-to-noise ratio threshold may be equal.

[0215] The setting strategy of switching measurement control parameters under the deteriorating signal-to-noise ratio includes:

[0216] Handover threshold setting: The neighbor cell handover threshold is low, and the cell-by-cell fine optimization is performed according to the wireless environment, and the inter-system handover threshold can be appropriately lowered according to the wireless environment;

[0217] Handover trigger time configuration: The handover trigger time is short, and it is finely optimized according to the wireless environment;

[0218] Filter coefficient configuration: The filter coefficient is low, and it is finely optimized according to the wireless environment;

[0219] When the signal-to-noise ratio deteriorates, the forced handover can be set, which can force the terminal to initiate handover to a specific neighboring cell such as a different frequency or a different system neighboring cell;

[0220] In the normal state of signal-to-noise ratio, there are no specific requirements for switching measurement control parameters, such as neighbor cell measurement and switching parameters, and fine optimization is made according to the wireless environment.

[0221] According to the above-mentioned different handover decision strategies for SNR deterioration and normal SNR conditions, it is possible to quickly switch to other neighboring cells of the system or other mobile communication systems when the SNR deteriorates, avoiding call drops and improving The switching accuracy is improved.

[0222] 7. UMM status related to data throughput measurement, including:

[0223] User Away State (AFK): The user is online, but does not use any services, and is in the on-line state;

[0224] User online status (BTK): The user is online and using services.

[0225] To determine whether the terminal is in the UMM state related to the above data throughput measurement, the measurement quantities that the terminal and base station need to measure include:

[0226] Uplink and downlink data throughput: Uplink and downlink throughput of mobile communication terminals.

[0227] The triggering condition of the user leaving state (AFK) includes: in a predetermined continuous time period (the nineteenth continuous time period), the user uplink and downlink data throughput is lower than the predetermined first throughput threshold;

[0228] User online status (BTK) trigger condition: in a predetermined continuous time period (twentieth continuous time period), the user uplink and downlink data throughput is higher than the predetermined second throughput threshold;

[0229] The above-mentioned predetermined nineteenth continuous time period and the twentieth continuous time period may be the same as the time period T T Within; the above-mentioned first throughput threshold and the second throughput threshold may be the same or different.

[0230] The neighbor handover strategy when the user is away includes:

[0231] Forced handover: The terminal can be forced to initiate a handover to a specific neighboring cell such as a different frequency or a neighboring cell of a different system;

[0232] The handover strategy when the user is online includes;

[0233] Forced handover: The terminal can be forced to initiate a handover to a specific neighboring cell such as a different frequency or a neighboring cell of a different system;

[0234] According to the above-mentioned different handover decision strategies for the user's away state and the user's online state, it is possible to actively switch from a high-speed mobile communication system to a low-speed mobile communication system (such as switching from a TD network to a GPRS network) when the user leaves, and when the user is online Actively switch from a low-speed mobile communication system to a high-speed mobile communication system (such as switching from a GPRS network to a TD network), thereby realizing the precise sharing of traffic load between different mobile communication systems and improving the utilization of system resources.

[0235] 8. Related UMM status of base station or terminal transmit power, including:

[0236] Full power transmission state (FuP): The transmission power of the mobile communication base station or terminal reaches the maximum value allowed by the corresponding capability or configuration parameters;

[0237] High power transmission state (HiP): the transmission power of the mobile communication base station or terminal is high, such as higher than the predetermined first transmission power threshold;

[0238] Low power transmission state (LoP): The transmission power of the mobile communication base station or terminal is low, such as lower than the predetermined second transmission power threshold;

[0239] For the base station and the terminal, the first and second transmit power thresholds used for comparison may be the same or different.

[0240] To determine whether the terminal is in the UMM state related to the above data throughput measurement, the measurement quantity that the terminal or base station needs to measure includes at least the following:

[0241] Terminal transmit power: the transmit power of mobile communication terminals;

[0242] Base station transmit power: the transmit power of a mobile communication base station on a specific downlink traffic channel;

[0243] The trigger condition of the full power transmission state (FuP) includes at least one of the following conditions:

[0244] Within a predetermined continuous period of time (the twenty-first continuous period of time), the transmit power of the mobile communication terminal always reaches the terminal capacity or reaches the maximum value allowed by the terminal configuration parameters;

[0245] Within a predetermined continuous period of time (the twenty-fourth continuous period of time), the base station transmit power always reaches the base station's capacity, or reaches the maximum allowed by the base station configuration parameters.

[0246] The trigger condition of the high power transmission state (HiP) includes at least one of the following conditions:

[0247] In a predetermined continuous time period (the twenty-second continuous time period), the mobile communication terminal transmit power is higher than the predetermined first transmit power threshold;

[0248] In a predetermined continuous time period (twenty-fifth continuous time period), the base station transmit power is higher than the predetermined third transmit power threshold.

[0249] The trigger condition of the low power transmission state (LoP) includes at least one of the following conditions:

[0250] In a predetermined continuous time period (the twenty-third continuous time period), the mobile communication terminal transmit power is lower than the predetermined second transmit power threshold;

[0251] In a predetermined continuous period of time (the twenty-sixth continuous period of time), the base station transmit power is lower than the predetermined fourth transmit power threshold;

[0252] The above-mentioned twenty-first continuous time period to the twenty-sixth continuous time period can be the same as the time period T p , The aforementioned transmit power threshold can be the same or different.

[0253] The setting strategies for switching measurement control parameters under full power transmission include:

[0254] Handover threshold setting: The neighbor cell handover threshold is low, and the cell-by-cell fine optimization is performed according to the wireless environment, and the inter-system handover threshold can be appropriately lowered according to the wireless environment;

[0255] Handover trigger time configuration: The handover trigger time is short, and it is finely optimized according to the wireless environment;

[0256] Filter coefficient configuration: The filter coefficient is low, and it is finely optimized according to the wireless environment;

[0257] In the full power transmission state, a forced handover can be set, and the terminal can be forced to initiate handover to a specific neighboring cell such as a different frequency or a neighboring cell of a different system.

[0258] The setting strategy of switching measurement control parameters in the high-power transmission state includes:

[0259] Handover threshold setting: The neighbor cell handover threshold is low, and the cell-by-cell fine optimization is performed according to the wireless environment, and the inter-system handover threshold can be appropriately lowered according to the wireless environment;

[0260] Handover trigger time configuration: The handover trigger time is short, and it is finely optimized according to the wireless environment;

[0261] Filter coefficient configuration: The filter coefficient is low and finely optimized according to the wireless environment.

[0262] In the low-power transmission state, there are no specific requirements for handover measurement control parameters such as neighbor cell measurement and handover decision parameters, and fine optimization is performed according to the wireless environment.

[0263] According to the above-mentioned different handover decision strategies adopted for the full power state, high power and low power state, it can quickly switch to other neighboring cells of the system or other mobile communication systems when the terminal is in full power or high power state to avoid call drop , Thereby improving the switching accuracy.

[0264] In specific applications, the UMM state is not limited to the above-mentioned types.

[0265] In specific implementation, certain UMM states can be turned on for specific application scenarios, and when setting the measurement quantities to be measured, it is desirable to judge the union of the measurement quantities required by the several UMM states.

[0266] The embodiment of the present invention allows the configuration of corresponding handover measurement control parameters for each UMM state on the cell of the mobile communication base station, for example, such as a neighbor cell list and handover decision parameters. Specifically, see Figure 4 Shown. Such as Figure 4 , Shows the corresponding neighbor cell list and handover decision parameters when the terminal is in UMM state A to state M. When the network determines that the terminal is in a different UMM state, it will issue the neighbor cell list and handover decision parameters in the corresponding state.

[0267] According to the above description of the switching measurement control parameter setting strategy in different UMM states, for some UMM states, there is no special requirement for the neighbor cell list.

[0268] Combine Figure 4 The steps specifically executed by the handover control method of the embodiment of the present invention are described:

[0269] a. When the mobile communication terminal MS initiates a service, the mobile communication network sets the terminal state to the initial state and issues a measurement control message:

[0270] The measurement control message should include the relevant measurement quantities of the UMM state. In this example, it includes the discriminative measurement quantities of each state (A1, A2, ...An, B1, B2, ...M1, M2, ...Mn), each UMM The state trigger conditions and state trigger parameters of the state can be notified to the terminal or not notified;

[0271] The measurement control message should include the initial state. The following is marked as state A, the parameter configuration under the state, the mobile communication network instructs the mobile communication terminal to check the neighbor cell (N A1 …N An ) Perform measurement, and the handover decision parameter can be notified to the terminal or not;

[0272] b. The mobile communication terminal and the base station measure each measurement value and report the data according to the instructions of the measurement control message. The data reporting method can be periodic reporting or event-triggered reporting;

[0273] c. When the measured value of the mobile communication base station and the terminal meets the trigger condition of a certain UMM state, the state change is triggered, and the terminal state is set to the corresponding UMM state, which is marked as state M below, and is dynamically based on the state change Adjustment of the handover parameters, and issue the neighbor list in this state (N M1 , N M2 , N M3 ……N Mn ) And switching decision parameters (T HM , H HM , C HM...), instruct the mobile communication terminal to perform measurement according to the new neighbor list and handover parameters;

[0274] d. For example, when the mobile communication terminal detects that the magnitude, such as level, quality, etc. of a neighboring cell meets the judgment conditions specified by the handover decision parameter, it will notify the network side radio network controller to start the handover process to the neighboring cell; When the mobile communication base station measures the magnitude of a neighboring cell, such as level, quality, etc., to meet the judgment conditions specified by the handover decision parameter, it notifies the network side radio network controller to start the handover process to the neighboring cell

[0275] Application case description:

[0276] In the following, a measurement control/handover algorithm based on distance judgment in a TD-SCDMA mobile communication network is taken as an example to illustrate the technical effects of the present invention. The basic idea of ​​distance handover is to determine that the terminal is in a cross-area coverage state when it leaves the coverage area of ​​the serving cell but does not switch to the surrounding neighboring area in time. The measurement values ​​and trigger conditions related to distance switching are as follows:

[0277] Cross-area coverage state measurement: time advance Tadv;

[0278] Cross-area coverage state trigger parameters: trigger duration TimetoTrigger, time advance threshold TadvThreshold

[0279] Trigger condition of cross-area coverage status: Within the continuous time specified by the TimetoTrigger parameter, the Tadv value measured by the mobile communication terminal is always greater than the threshold specified by TadvThreshold;

[0280] The neighbor cell list and handover decision parameters related to distance handover are configured as follows:

[0281] List of neighboring cells under non-cross-area coverage;

[0282] Handover decision parameters in non-cross-area coverage state;

[0283] Neighboring cell list under cross-area coverage

[0284] Handover decision parameters in the cross-area coverage state.

[0285] Such as Figure 5 , There are 10 base stations and 30 cells in the figure, the sequence number is from cell A1 to cell J3, A1 is the serving cell of the current terminal:

[0286] For cell A1, the configuration is as follows

[0287] (1) Measurement of cross-area coverage status:

[0288] TadvThreshold: trigger threshold for cross-area coverage events

[0289] TimetoTrigger: The trigger time of the cross-area coverage event

[0290] (2) Neighbor cell parameters in the initial state. In this example, the initial state of the terminal is set to the non-cross-area coverage state. In this state:

[0291] Neighborhood list: A2, A3, B2, B3, H1, J1, J2, a total of 7 neighborhoods;

[0292] Handover decision parameters include:

[0293] Switching hysteresis Hysteresis: 6dB

[0294] TimetoTrigger: 1280ms

[0295] CIO Cell Individual Offset: Configure one by one according to different neighboring cells

[0296] Filter factor: 6;

[0297] (3) Neighboring cell parameters under cross-area coverage:

[0298] Neighborhood list: A2, A3, B2, B3, H1, J1, J2, B1, C2, C3, D2, D3, E1, E2, E3, F1, F2, G3, H3, I1, I2, a total of 21 neighbors Area;

[0299] Handover decision parameters include:

[0300] Hysteresis: higher than normal Hysteresis parameters, such as 8dB

[0301] TimetoTrigger: lower than the normal TimetoTrigger parameter, such as 160~320ms

[0302] CIO: Configure one by one according to different neighboring cells

[0303] Filter coefficient: lower than the normal filter coefficient, such as 0 or 2

[0304] Under normal circumstances, the terminal is located in the coverage area of ​​cell A1. At this time, the terminal only needs to measure the surrounding 7 cells. In the same time, if the number of neighboring cells is small, the number of measurement reports for each neighboring cell is larger, which is beneficial Improve the accuracy of measurement and switching, such as Image 6 As shown, the terminal switches from A1 to B2.

[0305] In the case of cross-area coverage, the terminal has been far away from the coverage area of ​​cell A1. At this time, the network judges that the terminal is in a cross-covered state, and the network issues a list of neighboring cells for cross-cell coverage. In this state, the number of neighboring cells is increased. A large number of neighboring cells need to be measured. However, in the cross-area coverage state, the optimizer can configure separate handover decision parameters, and can flexibly adopt parameter optimization methods such as shortening the TimetoTrigger time and reducing the filter coefficient, so that the terminal can switch from A1 to F2. Such as Figure 7 Shown.

[0306] According to the measurement control and handover mechanism specified in the present invention, the mobile communication network can configure different neighbor cell lists and handover decision parameters for different conditions, which has great application value and significance for the refined control of the measurement and handover process and the improvement of network quality. .

[0307] Still taking distance switching as an example, under normal circumstances, the terminal only needs to measure a small number of neighboring cells in the inner layer, which improves the accuracy of neighboring cell measurement; in the case of cross-area coverage, the terminal measures a large area of ​​neighboring cells and can quickly switch to Correct neighboring cells to avoid dragging dropped calls due to driving out of the service cell and neighboring cell coverage area.

[0308] After the mobile communication network introduces the terminal measurement management (UMM) state, the mobile communication network can store and count the UMM state of the mobile communication terminal, and analyze user behavior based on the statistical results for business data analysis or auxiliary network optimization.

[0309] The invention also discloses a wireless network controller in the mobile communication system. FIG. 8 is a schematic structural diagram of a network side device according to an embodiment of the present invention. As shown in Fig. 8, the network side device includes: a parameter determination module 801, which is used to determine the current terminal measurement management based on the corresponding relationship between the preset terminal measurement management state and the measurement quantity to be measured and the switching measurement control parameter The measurement quantity to be measured and the handover measurement control parameter in the state; the measurement control message issuing module 802 is used to issue a measurement control message to the mobile terminal and/or base station, and the measurement control message includes the determined measurement to be measured Measurement volume; data receiving module 803, configured to receive the measurement data measured and reported by the mobile terminal and/or base station according to the measurement volume to be measured contained in the measurement control message; cell switching module 804, used to When the measurement data of at least one of the mobile terminal and the base station meets the handover decision condition determined by the handover measurement control parameter, a cell handover is triggered.

[0310] Preferably, the radio network controller, wherein the handover measurement control parameter includes: a neighbor cell list to be measured; the measurement data measured and reported by the terminal and/or base station includes: the terminal and/or base station According to the measurement quantity to be measured included in the measurement control message, the measurement data of the neighboring cells included in the neighboring cell list are measured and reported.

[0311] Preferably, the wireless network controller, wherein the terminal measurement management state change module is configured to change the terminal measurement management state that the terminal is currently in when the measurement data meets the trigger condition of the terminal measurement management state change Change to the terminal measurement management state corresponding to the trigger condition.

[0312] Preferably, the radio network controller, wherein the measurement control message issuing module is further configured to issue a measurement management state corresponding to the changed terminal measurement management state when the terminal measurement management state where the terminal is located is changed. A corresponding measurement control message, where the measurement control message includes the measurement quantity to be measured and the switching measurement control parameter in the changed terminal measurement management state.

[0313] Preferably, the radio network controller, wherein the measurement control message issued by the network side further includes: handover measurement control parameters; the cell handover module is further configured to receive the cell handover notification reported by the terminal The cell handover notification is issued by the terminal when it is determined that the downlink measurement data on the network side meets the handover decision condition determined according to the handover measurement control parameter.

[0314] In other embodiments of the present invention, a base station, a mobility management unit (MME) or other equipment with a handover measurement control function may implement the handover method of the embodiment of the present invention. The base station, mobility management unit (MME) or other equipment with handover measurement control function sends corresponding measurement control messages to the mobile terminal according to the current UMM state of the terminal, and judges whether the handover measurement control parameters are met according to the measurement data of the mobile terminal The determined handover decision condition triggers the cell handover. The changes and examples of UMM status refer to the previous descriptions, and will not be repeated here.

[0315] The embodiment of the present invention also provides a handover control method in a mobile communication system. The method includes the following steps:

[0316] Step A1: The network side determines the measurement quantity to be measured and the switching measurement control parameter in the current terminal measurement management state according to the corresponding relationship between the preset terminal measurement management state and the measurement quantity to be measured and the switching measurement control parameter ;

[0317] Step B1, the network side sends a measurement control message, the measurement control message includes the determined measurement quantity to be measured;

[0318] Step C1: The network side receives measurement data measured and reported by the mobile terminal according to the measurement quantity to be measured included in the measurement control message;

[0319] Step D1: The network side triggers a cell handover when the measurement data meets the handover decision condition determined by the handover measurement control parameter.

[0320] In the handover method of this embodiment, the method further includes: when the measurement data of the mobile terminal meets the trigger condition of the terminal measurement management state change, changing the terminal measurement management state that the terminal is currently in to the one corresponding to the trigger condition Terminal measurement management status. Further, the network side issues the measurement control message in the UMM state, and the measurement control message includes the measurement quantity to be measured and the switching measurement control parameter corresponding to the UMM state. Among them, the changes and examples of the UMM state are the same as those described above, and will not be repeated here.

[0321] Preferably, the above-mentioned network side may execute the above-mentioned steps through a radio network controller, a base station, a mobility management unit (MME) and/or other devices with a handover measurement control function.

[0322] The embodiment of the present invention also provides a handover control device in a mobile communication system. The network side device includes: a parameter determination module, which is used to measure and switch measurement control parameters according to a preset terminal measurement management state and a measurement quantity to be measured. The corresponding relationship between the two, determining the measurement quantity to be measured in the current terminal measurement management state and switching measurement control parameters; the measurement control message issuing module is used to issue measurement control messages, the measurement control messages include the The determined measurement quantity to be measured; a data receiving module for receiving the measurement data measured and reported by the mobile terminal according to the measurement quantity to be measured contained in the measurement control message; a cell switching module for receiving When the measurement data meets the handover decision condition determined by the handover measurement control parameter, a cell handover is triggered.

[0323] Preferably, the handover control device in the embodiment of the present invention further includes: a terminal measurement management state change module, configured to: when the measurement data reported by at least one of the mobile terminal and the base station meets the trigger condition of the terminal measurement management state change, The current terminal measurement management state of the terminal is changed to the terminal measurement management state corresponding to the trigger condition

[0324] Preferably, the measurement control message issuing module is further configured to issue a measurement control message corresponding to the changed terminal measurement management state when the terminal measurement management state where the terminal is located is changed, the measurement control message It contains the measurement quantities to be measured and the switching measurement control parameters in the changed terminal measurement management state.

[0325] Preferably, the above-mentioned handover control device can be implemented as: a radio network controller, a base station, a mobility management unit (MME) and/or other equipment with a handover measurement control function.

[0326] The present invention allows the network side to configure different neighbor cell lists and measurement quantities and switching parameters according to the different states of the terminal, and the network side issues different neighbor cell lists and parameters according to different judgments on the terminal measurement management state, which solves the complexity of the network The contradiction between the wireless environment and the requirements for fine coverage and the contradiction between the terminal measurement capability and the number of neighboring cell configurations have achieved precise switching control.

[0327] The above are the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles described in the embodiments of the present invention, several improvements and modifications can be made. These improvements and Retouching should also be regarded as the protection scope of the present invention.