CN101631348A - Neighbor cell detecting method - Google Patents

Abstract

The invention relates to a neighbor cell detecting method, which is characterized by arranging a distance threshold and arranging neighbor cell detecting timers and detection pausing timers respectively for neighbor cells to be tracked. The method comprises that: when a terminal accesses a network, the network side informs the terminal of information of a neighbor cell to be measured and orders the terminal to measure the neighbor cell; the terminal measures the neighbor cell, and starts a neighbor cell detecting timer corresponding to each neighbor cell according to the acquired neighbor cell information, and uses the current position of the terminal as an initial detecting position; and the terminal controls neighbor cell measuring time and detection pausing time according to a terminal displacement distance, the distance threshold and timing length of the detecting timer and the detection pausing timer corresponding to each neighbor cell. The terminal performs intermittent measurement on each neighbor cell by the neighbor cell detecting method, so that system resources and terminal power are saved, and the terminal can effectively track the neighbor cells.

Description

A kind of neighbor cell detecting method

Technical field

The present invention relates to the cell detection technology in the radio communication, be specifically related to a kind of neighbor cell detecting method.

Background technology

In Long Term Evolution (LTE) system of 3G (Third Generation) Moblie, in order to support Serving cell to switch, the LTE terminal need carry out measuring or inter-frequency measurement or system's measurements in the frequency, to determine the signal coverage varies and the signal quality of current service cell and adjacent area.

Safeguard the workload of adjacent area in order to reduce network side, generally do not dispose adjacent area in the frequency in the LTE system, and the adjacent area only disposes carrier frequency frequently, this just needs the LTE terminal constantly to go to follow the trail of, measure the adjacent area by the automatic measuring ability of self.Fig. 1 is a LTE terminal moving process schematic diagram, as shown in Figure 1, the initial position of LTE terminal is position A, the frequency of current service cell is frequency 1 (Frequency1), six adjacent areas are arranged around the current service cell, frequency is respectively frequency 2 (Frequency2), frequency 3 (Frequency3), frequency 4 (Frequency4), frequency 5 (Frequency5), frequency 6 (Frequency6) and frequency 7 (Frequency7), if the metering system of LTE terminal is an inter-frequency measurement, then move to the process of position B along route shown in Figure 1 from position A in the LTE terminal, the LTE terminal can be followed the trail of six adjacent areas always, measure.As can be seen from Figure 1, when the LTE terminal was in position A, frequency was that the adjacent area of Frequency7 can't detect signal or detected signal is extremely faint; When the LTE terminal is in position B, frequency is that the adjacent area of Frequency7 is not the best adjacent area of signal quality yet, so, the LTE terminal moves to the process of position B along route shown in Figure 1 from position A, the tracking and the measurement that to frequency are the adjacent area of Frequency7 have consumed a lot of electric weight of terminal, but without any meaning.

Though, in order to reduce the workload of LTE terminal, can be when the Serving cell quality be lower than to a certain degree, just start measurement to the adjacent area, as frequently interior measurement, inter-frequency measurement, system's measurements etc., but can be because follow the trail of the low excessively adjacent area of some signal qualitys, waste system resource, waste LTE terminal power, and make the LTE terminal can not follow the trail of the adjacent area effectively.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of neighbor cell detecting method, can conserve system resources and terminal power, and make terminal can follow the trail of the adjacent area effectively.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of neighbor cell detecting method is provided with distance threshold, and the adjacent area that need are followed the trail of is provided with adjacent area detection timer respectively and detects pause timer, and this method comprises:

When a, accessing terminal to network, the neighboring BS information that network side notice terminal need be measured, and command terminal carries out nearby region measurement;

B, terminal are according to the neighboring BS information that step a obtains, and timer is detected in the adjacent area that starts each adjacent area correspondence, carry out nearby region measurement with the terminal current location as detecting original position;

C, terminal detect timer according to the adjacent area of terminal displacement, set distance threshold and each adjacent area correspondence and detect the timing length of pause timer, control nearby region measurement.

The timing length that timer and detection pause timer are detected in described adjacent area is fixed value, and the described control of step c comprises the measurement of adjacent area:

C11, judge whether timer is detected in the adjacent area overtime, if, execution in step c12; Otherwise, continue the adjacent area is measured, return step c11;

C12, whether judge terminal displacement less than distance threshold, if then terminal is suspended corresponding adjacent area is measured, the start detection pause timer, and suspend original position, execution in step c14 as detecting with the terminal current location; Otherwise execution in step c13;

C13, terminal continue the adjacent area is measured, and replacement adjacent area detection timer, as after detecting original position, return step c11 with the terminal current location;

Whether c14, judge to detect pause timer overtime, or whether terminal displacement surpass distance threshold, if terminal is measured the adjacent area, and starts the adjacent area and detect timer, as after detecting original position, returns step c11 with the terminal current location; Otherwise, continue to suspend described adjacent area is measured, return step c14.

The adjacent area is set to be detected the maximum regularly length of timer and detects pause timer minimum timing length;

The timing length that timer is detected in described adjacent area is the product that a maximum regularly length of timer and a variable coefficient are detected in described adjacent area, and described variable coefficient is the ratio of terminal displacement and distance threshold;

The length of described detection pause timer is the product of a minimum detection pause timer length and a variable coefficient, and described variable coefficient is: two times of distance threshold poor with terminal displacement, compare the value that obtains again with distance threshold.

The described control of step c comprises the measurement of adjacent area:

C21, judge whether timer is detected in the adjacent area overtime, if timer expiry, then execution in step c22 are detected in the adjacent area; Otherwise terminal continues the adjacent area is measured, and returns step c21;

C22, terminal time-out are measured the adjacent area, and the start detection pause timer, serve as to detect to suspend original position with the terminal current location;

Whether c23, judge to detect pause timer overtime, if it is overtime to detect pause timer, then timer is detected in the starting terminal adjacent area, and carries out nearby region measurement with the terminal current location as detecting original position, returns step c21; Otherwise terminal continues to suspend to be measured described adjacent area, returns step c23.

Terminal is during to nearby region measurement, and described terminal displacement detects original position according to terminal current location and terminal and calculates;

When terminal was suspended the measurement of adjacent area, described terminal displacement calculated according to terminal current location and terminal time-out detection original position.

The neighbor cell detecting method that the present invention proposes, at each adjacent area that need follow the trail of the adjacent area being set detects timer and detects pause timer, detect the displacement that timer, detection pause timer and terminal are obtained according to position measurement by the adjacent area, control terminal carries out intermittence to each adjacent area and measures, so carry out the adjacent area detect can conserve system resources, save terminal power, and make terminal follow the trail of the adjacent area effectively.

Description of drawings

Fig. 1 is a LTE terminal moving process schematic diagram;

Fig. 2 is the neighbor cell detecting method flow chart of embodiment 1 based on the terminal with position-measuring functions;

Fig. 3 is the neighbor cell detecting method flow chart of embodiment 2 based on the terminal with position-measuring functions.

Embodiment

Basic thought of the present invention is: at each adjacent area that need follow the trail of the adjacent area is set and detects timer and detect pause timer, detect the displacement that timer, detection pause timer and terminal are obtained according to position measurement by the adjacent area, control terminal carries out intermittence to each adjacent area and measures.

Be that inter-frequency measurement is a specific embodiment with the terminal metering system below, in conjunction with the accompanying drawings the present invention be described in further detail.

In order to realize neighbor cell detecting method of the present invention, respectively each adjacent area that need follow the trail of being provided with the adjacent area detects timer and detects pause timer, the timing length that timer and detection pause timer are detected in the adjacent area can be set to fixed value, also can change with the variation of terminal displacement.

Embodiment 1:

In the present embodiment, the timing length that timer and detection pause timer are detected in the adjacent area is set to fixed value, and the timing length that timer is detected in the adjacent area is T _{Detect_max}, the length that detects pause timer is T _{Pause_max}, and, also be provided with distance threshold DistanceThresh, here T _{Detect_max}, T _{Pause_max}, DistanceThresh value generally by the system default setting.

Fig. 2 is the flow chart that embodiment 1 realizes neighbor cell detecting method, and as shown in Figure 2, the neighbor cell detecting method among the embodiment 1 mainly may further comprise the steps:

Step 201: during accessing terminal to network, automatic enable position measurement function.

Step 202: the neighboring BS information that network side will need to measure is informed terminal, and command terminal carries out nearby region measurement.

Here, network side can be determined its affiliated subdistrict according to the current present position of terminal, and then determines all adjacent areas that this terminal need be measured.Network side generally carries out nearby region measurement by measuring the control messages command terminal, and described measurement control messages is the neighboring BS information that need measure of carried terminal also.Terminal metering system in the present embodiment is an inter-frequency measurement, so, measure control messages and carry frequency point information, for example, the frequency that terminal need be measured is Frequency1, Frequency2, Frequency3 and Frequency4.

Step 203: terminal is carried out nearby region measurement, and the neighboring BS information that obtains according to step 202, start corresponding adjacent area at each adjacent area and detect timer, with the terminal current location as detecting original position.

In the present embodiment, timer is detected at different carrier frequency in different adjacent areas, if the frequency that terminal need be measured is Frequency1, Frequency2, Frequency3 and Frequency4, timer 1 is detected in the respectively corresponding adjacent area of Frequency1, Frequency2, Frequency3 and Frequency4 so, the adjacent area is detected timer 2, adjacent area detection timer 3 and adjacent area and detected timer 4, and the timing length that timer is detected in each adjacent area all is defaulted as T _{Detect_max}

Step 204: judge whether timer is detected in the adjacent area overtime, if, execution in step 206; Otherwise, execution in step 205.

Step 205: terminal continues the adjacent area is measured, and returns step 204.

Step 206: whether judge terminal displacement less than distance threshold, if, execution in step 208; Otherwise execution in step 207.

Here, terminal displacement calculates according to terminal current location and terminal detection original position.

Step 207: terminal continues the adjacent area is measured, and replacement adjacent area detection timer, as detecting original position, returns step 204 with the terminal current location.

Step 208: the terminal time-out is measured corresponding adjacent area, and the start detection pause timer, and record terminal current location is suspended original position for detecting.

If the frequency that terminal need be measured is Frequency1, Frequency2, Frequency3 and Frequency4, Frequency1, Frequency2, Frequency3 and Frequency4 are corresponding respectively so detects pause timer 1, detects pause timer 2, detects pause timer 3 and detects pause timer 4, and each timing length that detects pause timer all is defaulted as T _{Pause_max}

Whether step 209: it is overtime judge to detect pause timer, and whether terminal displacement surpass distance threshold, if it is overtime to detect pause timer, or terminal displacement surpasses distance threshold, and then execution in step 210, otherwise, execution in step 211.

Here, terminal displacement calculates according to terminal current location and terminal detection time-out original position.

Step 210: terminal is measured the adjacent area, and starts adjacent area detection timer, as detecting original position, returns step 204 with the terminal current location.

Step 211: terminal continues to suspend to be measured described adjacent area, returns step 209.

In the present embodiment, it is that example describes that above-mentioned steps 204～step 211 is only measured frequency with certain, and the described method of step 204～step 211 is measured frequency to each and all is suitable for.

Embodiment 2:

In the present embodiment, distance threshold DistanceThresh is set equally, timer is detected in the adjacent area, and the variation with terminal displacement changes with the timing length that detects pause timer, and the length T that timer is detected in the adjacent area specifically is set _DetectFor:

$T_{\mathrm{Detect}}=T_{\mathrm{Detect}\_\max }\×\frac{\mathrm{Dis}\tan \mathrm{ce}}{\mathrm{Dis}\tan \mathrm{ceThresh}}---\left(1\right)$

Wherein, T _{Detect_max}Detect the maximum regularly length of timer for the adjacent area, Distance is a terminal displacement.

After the timer startup was detected in the adjacent area, acquiescence is length T regularly _Detect=T _{Detect_max}, Distance changes up to terminal displacement, and promptly Distance is non-vanishing, and the adjacent area is detected timer and is just begun to adjust according to formula (1) the timing length of self.By formula (1) as can be seen, terminal displacement is more little, and it is short more that the timing length of timer is detected in the adjacent area, and it is easy more overtime that promptly timer is detected in the adjacent area, and it is short more that terminal is carried out the time of nearby region measurement; Otherwise terminal displacement is big more, and the timing length that timer is detected in the adjacent area is long more, and promptly the adjacent area is detected timer and is not easy overtimely more, and it is long more that terminal is carried out time of nearby region measurement.

Here, for fear of detect timer regularly length be not intended to the free burial ground for the destitute and increase, Distance is set reaches after the DistanceThresh, even Distance continues to increase, timer is detected in the adjacent area, and still to keep regularly length be T _{Detect_max}

Be provided with and detect the pause timer length T _PauseFor:

$T_{\mathrm{Pause}}=T_{\mathrm{Pause}\_\min }\×\frac{2\mathrm{Dis}\tan \mathrm{ceThresh}-\mathrm{Dis}\tan \mathrm{ce}}{\mathrm{Dis}\tan \mathrm{ceThresh}}---\left(2\right)$

Wherein, T _{Pause_min}Be minimum detection pause timer length.

After detecting the pause timer startup, acquiescence is length T regularly _Pause=T _{Pause_min}, Distance changes up to terminal displacement, and promptly Distance is non-vanishing, detects pause timer and just begins to adjust according to formula (2) the timing length of self.By formula (2) as can be seen, terminal displacement is more little, and the timing length that detects pause timer is long more, promptly detects pause timer and is not easy overtimely more, and it is long more that terminal is suspended the time that the adjacent area is measured; Otherwise terminal displacement is big more, and the timing length that detects pause timer is short more, and it is easy more overtime promptly to detect pause timer, and it is short more that terminal is suspended the time that the adjacent area is measured.

Here, for fear of detect timer regularly length be not intended to the free burial ground for the destitute and reduce, Distance is set reaches after the DistanceThresh, even Distance continues to increase, detecting pause timer, still to keep regularly length be T _{Pause_min}

Fig. 3 is a neighbor cell detecting method flow chart among the embodiment 2, as shown in Figure 3, realizes among the embodiment 2 that the method that the adjacent area is detected mainly may further comprise the steps:

Step 31～step 33: identical with the processing of step 201～step 203.

Step 34: judge whether timer is detected in the adjacent area overtime, if timer expiry is detected in the adjacent area, then execution in step 36; Otherwise, execution in step 35.

The timing length that timer is detected in the adjacent area as shown in Equation (1), wherein, terminal displacement Distance according to the terminal current location with detect original position and calculate.

Step 35: terminal continues the adjacent area is measured, and returns step 34.

Step 36: the terminal time-out is measured the adjacent area, and the start detection pause timer, suspends original position with the terminal current location as detecting.

Step 37: judge whether the detection pause timer is overtime, if it is overtime to detect pause timer, then execution in step 39, otherwise, execution in step 38.

Here, the timing length that detects pause timer as shown in Equation (2), wherein, terminal displacement Distance suspends original position and calculates with detecting according to the terminal current location.

Step 38: terminal continues to suspend to be measured the adjacent area, returns step 37.

Step 39: terminal is measured the adjacent area, and starts adjacent area detection timer, as detecting original position, returns step 34 with the terminal current location.

In the present embodiment, it is that example describes that above-mentioned steps 34～step 39 is only measured frequency with certain, and the described method of step 34～step 39 is measured frequency to each and all is suitable for.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (5)

1, a kind of neighbor cell detecting method is characterized in that, distance threshold is set, and the adjacent area that need are followed the trail of is provided with adjacent area detection timer respectively and detects pause timer, and this method comprises:

When a, accessing terminal to network, the neighboring BS information that network side notice terminal need be measured, and command terminal carries out nearby region measurement;

B, terminal are according to the neighboring BS information that step a obtains, and timer is detected in the adjacent area that starts each adjacent area correspondence, carry out nearby region measurement with the terminal current location as detecting original position;

C, terminal detect timer according to the adjacent area of terminal displacement, set distance threshold and each adjacent area correspondence and detect the timing length of pause timer, control nearby region measurement.

2, method according to claim 1 is characterized in that, the timing length that timer and detection pause timer are detected in described adjacent area is fixed value, and the described control of step c comprises the measurement of adjacent area:

C11, judge whether timer is detected in the adjacent area overtime, if, execution in step c12; Otherwise, continue the adjacent area is measured, return step c11;

C12, whether judge terminal displacement less than distance threshold, if then terminal is suspended corresponding adjacent area is measured, the start detection pause timer, and suspend original position, execution in step c14 as detecting with the terminal current location; Otherwise execution in step c13;

C13, terminal continue the adjacent area is measured, and replacement adjacent area detection timer, as after detecting original position, return step c11 with the terminal current location;

Whether c14, judge to detect pause timer overtime, or whether terminal displacement surpass distance threshold, if terminal is measured the adjacent area, and starts the adjacent area and detect timer, as after detecting original position, returns step c11 with the terminal current location; Otherwise, continue to suspend described adjacent area is measured, return step c14.

3, method according to claim 1 is characterized in that, the adjacent area is set detects the maximum regularly length of timer and detect pause timer minimum timing length;

The timing length that timer is detected in described adjacent area is the product that a maximum regularly length of timer and a variable coefficient are detected in described adjacent area, and described variable coefficient is the ratio of terminal displacement and distance threshold;

The length of described detection pause timer is the product of a minimum detection pause timer length and a variable coefficient, and described variable coefficient is: two times of distance threshold poor with terminal displacement, compare the value that obtains again with distance threshold.

4, method according to claim 3 is characterized in that, the described control of step c comprises the measurement of adjacent area:

C21, judge whether timer is detected in the adjacent area overtime, if timer expiry, then execution in step c22 are detected in the adjacent area; Otherwise terminal continues the adjacent area is measured, and returns step c21;

C22, terminal time-out are measured the adjacent area, and the start detection pause timer, serve as to detect to suspend original position with the terminal current location;

Whether c23, judge to detect pause timer overtime, if it is overtime to detect pause timer, then timer is detected in the starting terminal adjacent area, and carries out nearby region measurement with the terminal current location as detecting original position, returns step c21; Otherwise terminal continues to suspend to be measured described adjacent area, returns step c23.

According to claim 2 or 3 described methods, it is characterized in that 5, terminal is during to nearby region measurement, described terminal displacement detects original position according to terminal current location and terminal and calculates;

When terminal was suspended the measurement of adjacent area, described terminal displacement calculated according to terminal current location and terminal time-out detection original position.

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