CN102056211A - Method and system for triggering neighbor cell measurement - Google Patents
Method and system for triggering neighbor cell measurement Download PDFInfo
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- CN102056211A CN102056211A CN2009102091682A CN200910209168A CN102056211A CN 102056211 A CN102056211 A CN 102056211A CN 2009102091682 A CN2009102091682 A CN 2009102091682A CN 200910209168 A CN200910209168 A CN 200910209168A CN 102056211 A CN102056211 A CN 102056211A
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Abstract
The invention discloses a method for triggering neighbor measurement, comprising the following steps: adding the received signal quality threshold (RSQT) of a serving cell to measurement control information which is sent to a terminal by the serving cell; measuring the reference signal received power (RSRP) and the reference signal received quality (RSRQ) of the serving cell by the terminal; and beginning to measure the neighbor cell by the terminal when the obtained RSRP of the serving cell is less than received signal strength (RSS) or the obtained RSRQ of the serving cell is less than the RSQT of the serving cell. The invention also discloses a system for triggering neighbor cell measurement. By using the method, the problem that the neighbor cell measurement is not triggered in time when macro cells are subject to switching and the macro cells are switched to household cells can be solved, thus reducing probability of switching failures.
Description
Technical field
The present invention relates to the RRM field in the wireless communication system, particularly a kind of method and system that trigger adjacent cell measurement.
Background technology
Being provided with the influence of performance of handoffs of handoff parameter is very big.It is extremely important for the performance of sub-district switching that adjacent cell measurement in the handoff parameter begins thresholding, if it is unreasonable that this parameter is provided with, to cause adjacent cell measurement (to comprise: the measurement of the adjacent sub-district of co-frequency neighbor cell, iso-frequency adjacent community and different radio access technologies) untimely, thereby the promptness that influence is switched, and cause handoff failure.
Existing switching flow mainly may further comprise the steps as shown in Figure 1:
Step 101: Serving cell is to the control information of terminal sending measuring.
According to 3GPP 36.331 standards, in this step, Serving cell will send to terminal to S-measure as the part of measuring control information.S-measure is the received signal strength threshold of Serving cell, and whether the receiving intensity that is used to weigh the reference signal of Serving cell meets the requirements.Prior art begins thresholding with S-measure as adjacent cell measurement.
Step 102: terminal is measured the Reference Signal Received Power (RSRP:Reference Signal Received Power) of Serving cell, and whether the RSRP that judges Serving cell satisfies less than this condition of S-measure, when satisfying, continue execution in step 103.
Step 103: terminal begins adjacent cell measurement.
Step 104: terminal judges that according to the result of adjacent cell measurement whether the A3 incident satisfies, and when the A3 incident satisfies, continues execution in step 105.
Step 105: the measurement result that reports adjacent sub-district to Serving cell.
Step 106: Serving cell carries out switch decision, determines the Target cell that switches.
Step 107: Serving cell sends handoff request to Target cell.
Step 108: Target cell is admitted control.
Step 109: Target cell returns handoff request to Serving cell and replys.
Step 110: Serving cell sends switching command to terminal.
By above-mentioned existing handoff procedure as seen, terminal only when the RSRP that measures Serving cell is lower than certain threshold value, just can begin to carry out adjacent cell measurement.
Yet technique scheme is only effective at omnidirectional antenna sub-district as shown in Figure 2, and this technical scheme is inoperable under the applied environment of as shown in Figure 3 the macro base station that has the sector.Specifically the reasons are as follows:
Referring to Fig. 3, the current service cell of supposing terminal is sector 1, and sector 2 and sector 3 are adjacent sub-districts of sector 1.When terminal moved to as shown in the figure position, 1 signal that receives was more intense from the sector, and the interference of the sector 2 that is subjected to is also very strong, and therefore, the signal to noise ratio of actual reference signal is more weak, should carry out adjacent cell measurement.But, because the RSRP of the Serving cell that terminal measures also begins thresholding greater than adjacent cell measurement, do not meet the condition that begins to carry out adjacent cell measurement, therefore, terminal can not begin adjacent cell measurement, thus the promptness that influence is switched, and cause handoff failure.
In addition, under the applied environment of macrocell and home cell coexistence, even more serious than the situation of the macrocell of being with the sector, because home cell is covered by macrocell, the distance between home cell and the macro base station is very near sometimes.Referring to Fig. 4, the current service cell of supposing terminal is sector 1, and sector 2, sector 3 and home cell are the adjacent sub-districts of sector 1.When terminal moved to as shown in the figure position, from Serving cell, promptly the signal that receives of sector 1 was more intense, and the interference of the home cell that is subjected to is also very strong, and therefore, the signal to noise ratio of actual reference signal is more weak, should carry out adjacent cell measurement.But, because the RSRP that terminal measures also begins thresholding greater than adjacent cell measurement, do not meet the condition that begins to carry out adjacent cell measurement, therefore, terminal can not begin adjacent cell measurement, thus the promptness that influence is switched, and cause handoff failure.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and system that trigger adjacent cell measurement, be intended to solve between the macrocell switch and macrocell when home cell switches, can't in time trigger the problem of adjacent cell measurement, thereby reduce the probability of handoff failure.
For achieving the above object, the invention provides a kind of method that triggers adjacent cell measurement, this method comprises: terminal receives the measuring control information that Serving cell sends, and comprises in the described measuring control information: the received signal strength threshold of Serving cell and received signal quality thresholding; Terminal is measured the Reference Signal Received Power and the Reference Signal Received Quality of Serving cell, if the Reference Signal Received Power of the Serving cell that measures is less than the received signal strength threshold of Serving cell, the Reference Signal Received Quality of the Serving cell that perhaps measures is less than the received signal quality thresholding of Serving cell, and then terminal begins adjacent cell measurement.
The present invention also provides a kind of system, and this system comprises: terminal and Serving cell; Described Serving cell is used for sending measuring control information to described terminal, comprises in the described measuring control information: the received signal strength threshold of Serving cell and received signal quality thresholding; Described terminal, be used to measure the Reference Signal Received Power and the Reference Signal Received Quality of described Serving cell, in the Reference Signal Received Power of the Serving cell that measures received signal strength threshold less than Serving cell, the Reference Signal Received Quality of the Serving cell that perhaps measures is during less than the received signal quality thresholding of Serving cell, and terminal begins adjacent cell measurement.
As seen from the above technical solution, received signal strength threshold and the received signal quality thresholding of the present invention by Serving cell is set, and judge according to the received signal of Serving cell by terminal, in the Reference Signal Received Power of Serving cell received signal strength threshold less than Serving cell, when perhaps the Reference Signal Received Quality of Serving cell is less than the received signal quality thresholding of Serving cell, the beginning adjacent cell measurement, thereby avoided the untimely problem of measurement in the face of application scenarios as shown in Figure 3 and Figure 4 the time, improve the promptness of switching, and reduced the probability of handoff failure.
Description of drawings
Fig. 1 is existing switching flow schematic diagram;
Fig. 2 is the schematic diagram that the adjacent cell measurement of omnidirectional antenna macrocell begins;
Fig. 3 is the schematic diagram that the adjacent cell measurement of fan antenna macrocell begins;
The schematic diagram that adjacent cell measurement when Fig. 4 is fan antenna macrocell and home cell coexistence begins;
Fig. 5 triggers the schematic flow sheet of the method for adjacent cell measurement for the present invention;
Fig. 6 is the equivalent schematic of different received signal strength threshold in the fan antenna macrocell;
Fig. 7 is that the sub-district performance of handoffs that utilizes different adjacent cell measurements to begin thresholding compares.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Main thought of the present invention is: the received signal quality thresholding that increases Serving cell at Serving cell in the measuring control information that terminal issues, and measure the RSRP and the Reference Signal Received Quality (RSRQ:Reference Signal Received Quality) of Serving cell by terminal, in the RSRP of the Serving cell that measures received signal strength threshold less than Serving cell, the RSRQ of the Serving cell that perhaps measures is during less than the received signal quality thresholding of Serving cell, and terminal begins adjacent cell measurement.
After the beginning adjacent cell measurement, the follow-up execution in step of the present invention is same as the prior art, as step 104～110, does not repeat them here.
Fig. 5 triggers the schematic flow sheet of the method for adjacent cell measurement for the present invention.Referring to Fig. 5, this method comprises:
Step 501: terminal receives the measuring control information that Serving cell sends, and comprises in the described measuring control information: the received signal strength threshold of Serving cell and received signal quality thresholding;
Step 502: terminal is measured the Reference Signal Received Power and the Reference Signal Received Quality of Serving cell, if the Reference Signal Received Power of the Serving cell that measures is less than the received signal strength threshold of Serving cell, the Reference Signal Received Quality of the Serving cell that perhaps measures is less than the received signal quality thresholding of Serving cell, and then terminal begins adjacent cell measurement.
When received signal quality thresholding that needs the update service sub-district or received signal strength threshold, the macro base station of serving terminal can upgrade by reconfiguring of measuring control information.
The computing formula of the RSRQ that defines in 3GPP 36.214 standards is as the formula (1):
According to background technology, when terminal is switched between macrocell, and from macrocell when home cell switches, if adopt prior art will cause in time to begin adjacent cell measurement, and then cause switching untimely and handoff failure, therefore, technical solution of the present invention is applicable to that Serving cell is a macrocell, and adjacent sub-district is the situation of macrocell or home cell.
Be example with application scenarios shown in Figure 3 below, the beneficial effect of technical solution of the present invention is described.
Referring to Fig. 3, when terminal moved to as shown in the figure position, 1 signal that receives was more intense from the sector, and the interference of the sector 2 that is subjected to is also very strong, and therefore, the signal to noise ratio of actual reference signal is more weak, should carry out adjacent cell measurement.According to the inventive method, with the RSRQ of through type (1) calculation services sub-district.In the formula (1), though the RSRP of sector 1 is bigger, but RSSI is the received signal intensity that comprises sector 1 and sector 2, also can be bigger, after both are divided by, to obtain a less RSRQ, thereby satisfy RSRQ this condition of received signal quality thresholding less than set Serving cell, triggering terminal is carried out adjacent cell measurement.Therefore,, improve the promptness of switching, reduce the probability of handoff failure even during greater than the received signal strength threshold of set Serving cell, also can triggering terminal carry out adjacent cell measurement at the RSRP of Serving cell.
Corresponding to said method, the present invention also provides a kind of system to comprise: terminal and Serving cell.Wherein:
Described Serving cell is used for sending measuring control information to described terminal, comprises in the described measuring control information: the received signal strength threshold of Serving cell and received signal quality thresholding;
Described terminal, be used to measure the Reference Signal Received Power and the Reference Signal Received Quality of described Serving cell, in the Reference Signal Received Power of the Serving cell that measures received signal strength threshold less than Serving cell, the Reference Signal Received Quality of the Serving cell that perhaps measures is during less than the received signal quality thresholding of Serving cell, and terminal begins adjacent cell measurement.
Described terminal, the resource block number and the Reference Signal Received Power that are used for receiving in the bandwidth multiply each other, and indicate the Reference Signal Received Quality of resulting value as Serving cell divided by total received signal intensity in the measurement bandwidth.
In the said system, described Serving cell is a macrocell; Described terminal is used for adjacent macrocell and home cell are carried out adjacent cell measurement.
In the said system, described Serving cell also is used for reconfiguring measuring control information to described terminal, with received signal strength threshold and the received signal quality thresholding that upgrades described Serving cell;
Described terminal also is used for according to Serving cell the reconfiguring of measuring control information upgraded the received signal strength threshold and the received signal quality thresholding of described Serving cell.
Below by a concrete example, the number of times of prior art and handoff failure of the present invention is compared explanation.
Fig. 6 shows 3 adjacent sectors: sector 1, sector 2 and sector 3, the radius of each sector are 577 meters.Two circles have been shown among Fig. 6, wherein:
With the macro base station is the center of circle, circle expression shown in broken lines: S-measure (that is: the received signal strength threshold of Serving cell) is set to-during 40dBm, begins to carry out adjacent cell measurement when being equivalent to apart from 150 meters of macro base stations;
With the macro base station is the center of circle, with the circle expression shown in the chain-dotted line: S-measure be set to-during 60dBm, being equivalent to apart from macro base station is for 507 meters to begin to carry out adjacent cell measurement.
Simulation result by Fig. 7 we as can be seen: when only judging whether to begin adjacent cell measurement according to the reference signal receiving intensity, if S-measure is set to-60dBm, begin to carry out adjacent cell measurement when being equivalent to apart from 507 meters of macro base stations, in switching for 3747 times altogether, the number of times of handoff failure is 1007 times, accounts for 26.9% of total switching times.When only judging whether to begin adjacent cell measurement according to the reference signal receiving intensity, if S-measure is set to-40dBm, begin to carry out adjacent cell measurement when being equivalent to, in switching for 3804 times altogether apart from 150 meters of macro base stations, the number of times of handoff failure is 300, accounts for 7.9% of total switching times.And, do not have the situation of handoff failure to occur as employing-10.8dB during as the received signal quality thresholding of Serving cell.Adopt RSRQ to judge whether to begin adjacent sub-district as seen from the figure and switch the number of times that switches that may cause rattling less increase is arranged, this can take some signal resources, but for the performance of switching, handoff failure is bigger to the performance impact of system.Therefore, employing the present invention can significantly reduce the number of times of handoff failure, improves the performance of system.
As seen from the above-described embodiment, received signal strength threshold and the received signal quality thresholding of the present invention by Serving cell is set, and judge according to the received signal of Serving cell by terminal, in the Reference Signal Received Power of Serving cell received signal strength threshold less than Serving cell, when perhaps the Reference Signal Received Quality of Serving cell is less than the received signal quality thresholding of Serving cell, the beginning adjacent cell measurement, thereby avoided the untimely problem of measurement in the face of application scenarios as shown in Figure 3 and Figure 4 the time, improve the promptness of switching, and reduced the probability of handoff failure.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a method that triggers adjacent cell measurement is characterized in that, comprising:
Terminal receives the measuring control information that Serving cell sends, and comprises in the described measuring control information: the received signal strength threshold of Serving cell and received signal quality thresholding;
Terminal is measured the Reference Signal Received Power and the Reference Signal Received Quality of Serving cell, if the Reference Signal Received Power of the Serving cell that measures is less than the received signal strength threshold of Serving cell, the Reference Signal Received Quality of the Serving cell that perhaps measures is less than the received signal quality thresholding of Serving cell, and then terminal begins adjacent cell measurement.
2. method according to claim 1 is characterized in that, the account form of the Reference Signal Received Quality of Serving cell is:
3. method according to claim 1 and 2 is characterized in that:
Described Serving cell is a macrocell, and described adjacent sub-district is macrocell or home cell.
4. method according to claim 1 and 2 is characterized in that, this method further comprises:
Described terminal to the reconfiguring of measuring control information, is upgraded the received signal strength threshold and the received signal quality thresholding of described Serving cell according to described Serving cell.
5. a system is characterized in that, comprising: terminal and Serving cell;
Described Serving cell is used for sending measuring control information to described terminal, comprises in the described measuring control information: the received signal strength threshold of Serving cell and received signal quality thresholding;
Described terminal, be used to measure the Reference Signal Received Power and the Reference Signal Received Quality of described Serving cell, in the Reference Signal Received Power of the Serving cell that measures received signal strength threshold less than Serving cell, the Reference Signal Received Quality of the Serving cell that perhaps measures is during less than the received signal quality thresholding of Serving cell, and terminal begins adjacent cell measurement.
6. system according to claim 5 is characterized in that:
Described terminal, the resource block number and the Reference Signal Received Power that are used for receiving in the bandwidth multiply each other, and indicate the Reference Signal Received Quality of resulting value as Serving cell divided by total received signal intensity in the measurement bandwidth.
7. according to claim 5 or 6 described systems, it is characterized in that:
Described Serving cell is a macrocell;
Described terminal is used for adjacent macrocell and home cell are carried out adjacent cell measurement.
8. according to claim 5 or 6 described systems, it is characterized in that:
Described Serving cell also is used for reconfiguring measuring control information to described terminal, with received signal strength threshold and the received signal quality thresholding that upgrades described Serving cell;
Described terminal also is used for according to Serving cell the reconfiguring of measuring control information upgraded the received signal strength threshold and the received signal quality thresholding of described Serving cell.
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Application publication date: 20110511 |