CN107517470B - Cell measurement method and device - Google Patents
Cell measurement method and device Download PDFInfo
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- CN107517470B CN107517470B CN201610436790.7A CN201610436790A CN107517470B CN 107517470 B CN107517470 B CN 107517470B CN 201610436790 A CN201610436790 A CN 201610436790A CN 107517470 B CN107517470 B CN 107517470B
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
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Abstract
The application discloses a cell measurement method and a device, wherein the method comprises the following steps: in each wireless frame, User Equipment (UE) determines the order of the modulation coding mode of the current service sub-band; and executing corresponding cell measurement operation according to the frame number of the wireless frame according to a preset measurement rule only when the order is less than or equal to a preset threshold value. The invention can support the adjacent cell switching and ensure that the transmission rate of the air interface data is not reduced.
Description
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a cell measurement method and apparatus.
Background
In a multi-channel wireless communication system, the entire frequency band resource is divided into several sub-bands, which are divided into two categories: a synchronization sub-band and a traffic sub-band. The synchronous sub-band is mainly used for sending synchronous and broadcast signals, and the service sub-band is mainly used for uplink and downlink data transmission. And the UE physical layer periodically performs the measurement of the local cell and the adjacent cell on the synchronous sub-band according to the configured measurement period, and calculates whether the switching condition is met or not according to the measurement result, if the switching condition is met, the UE initiates a switching request to the eNodeB to complete the subsequent switching process.
In the existing cell measurement scheme, the UE does not interrupt service data transmission during the measurement of the synchronization subband, that is, the neighbor measurement and the service transmission are performed simultaneously, and this design way makes the UE have a switching capability without reducing the transmission efficiency of air interface data, thereby placing a higher requirement on the hardware processing capability of the UE.
Since the chip terminal is designed to be miniaturized, low-cost and low-power, the hardware processing capability of the UE is limited. At present, the design scheme for simultaneously performing measurement and service exceeds the maximum processing capacity of a chip terminal in practical application, so that the measurement and the service cannot be considered at the same time: if the adjacent cell switching characteristic is not supported, the UE is disconnected in the moving process; if the adjacent cell switching characteristic is supported, the modulation coding mode of the service data can only support MCS to 8 (MCS to 11 can be supported when the adjacent cell switching is not supported), and the transmission rate of the air interface data is reduced by nearly one time; the former has a large influence on the transmission performance of the system and is not generally adopted in practical application, and the latter can reduce the transmission rate of air interface data when being realized.
Therefore, the cell measurement scheme for simultaneously performing measurement and service cannot support neighbor cell switching in practical application and ensure that the transmission rate of air interface data is not reduced.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a cell measurement method and apparatus, which can support the neighboring cell handover and ensure that the transmission rate of air interface data is not reduced.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a cell measurement method, comprising:
in each wireless frame, User Equipment (UE) determines the order of the modulation coding mode of the current service sub-band; and executing corresponding cell measurement operation according to the frame number of the wireless frame according to a preset measurement rule only when the order is less than or equal to a preset threshold value.
A cell measurement apparatus, comprising:
a modulation coding mode determining unit, configured to determine, at each radio frame, an order of a modulation coding mode of a current service subband of the UE;
and the cell measuring unit is used for executing corresponding cell measuring operation according to the frame number of the wireless frame according to a preset measuring rule only when the order is less than or equal to a preset threshold value.
In summary, the cell measurement method and apparatus provided by the present invention control the execution time of the cell measurement operation according to the order of the current modulation and coding scheme of the UE, that is, the cell measurement is executed only when the order of the modulation and coding scheme is low (that is, smaller than a certain threshold), so that the switching probability is high when the order of the modulation and coding scheme is low, and then the cell measurement is executed, which enables the UE to support the neighboring cell switching, and simultaneously effectively reduces the processing overhead of the cell measurement, so that the processing capability of the existing UE can meet the processing overhead of the present invention.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The core idea of the invention is as follows: in each frame, whether corresponding cell measurement operation is executed or not is determined according to the modulation and coding mode of the UE, if the modulation and coding mode of the UE is in a low order, the communication quality is general, which indicates that the UE is likely to be in the edge of a cell, and the probability of cell switching is high, the corresponding cell measurement operation needs to be triggered, otherwise, if the modulation and coding mode of the UE is in a high order, the communication quality is good, which indicates that the UE is likely to be in the center of the cell, cell switching is not performed in the center of the cell, and the cell measurement operation is not triggered to be executed. Therefore, the cell measurement operation is triggered only when needed, the processing overhead generated by cell measurement can be effectively reduced, the requirement on the hardware processing capacity of the UE can be greatly reduced, and the transmission rate of air interface data can be ensured not to be reduced while the adjacent cell switching is supported.
Fig. 1 is a schematic flowchart of a method according to an embodiment of the present invention, and as shown in fig. 1, a cell measurement method implemented by the embodiment mainly includes:
In this step, the modulation and coding scheme currently used by the traffic channel of the UE needs to be determined, so as to control the execution of the cell measurement operation of the current radio frame according to the order thereof in step 102.
The order determination method of the modulation coding scheme is known by those skilled in the art and is not described herein again.
And 102, executing corresponding cell measurement operation according to the frame number of the wireless frame according to a preset measurement rule only when the order is less than or equal to a preset threshold value.
In this step, the execution of the corresponding cell measurement operation is triggered only when the order of the modulation and coding scheme determined in step 101 is low (i.e., exceeds the preset threshold), so that the execution of the cell measurement operation is not triggered when the order of the modulation and coding scheme is high, thereby greatly reducing the cell measurement overhead of the UE. As described above, when the traffic channel of the UE operates in the lower order modulation coding mode, it indicates that the quality of the traffic channel is general, and the UE is located at the edge of the cell and has a high possibility of performing neighbor cell handover, and at this time, the cell measurement operation is triggered, so that the support of cell handover can be realized; on the contrary, when the traffic channel of the UE works in the higher-order modulation coding mode, it indicates that the communication quality is better, and it is likely to be located in the center of the cell, and the probability of cell handover is very low, and at this time, the cell measurement operation is not triggered to be executed, so that although the processing overhead of the traffic channel works in the higher-order modulation coding mode is relatively high, the processing capability of the chip terminal can still meet the requirement because the neighbor cell measurement calculation is not performed, and therefore, it can be ensured that the transmission rate of the air interface data is not reduced.
Therefore, in this step, only when the traffic channel of the UE operates in the lower order modulation and coding scheme, the corresponding cell measurement operation is performed, so that the order of the modulation and coding scheme is not reduced while the neighboring cell handover is supported, and it is ensured that the transmission rate of the air interface data is not reduced.
The threshold value can be set by those skilled in the art according to the channel characteristics in the actual application scenario. Considering that in practical application at present, when the traffic channel operates at MCS5, the channel quality is general, and the UE is at the edge of the cell and the probability of handover is high, the threshold may be set to 5.
Preferably, for better compatibility with the existing system, the measurement rule may be implemented by using an existing measurement rule, for example, when the three-cell networking mode is used, the measurement rule may specifically include the following:
when the frame number SFN% X is 0, the UE receives downlink antenna data at a synchronization frame of a synchronization subband s0 of the serving cell, and performs timing estimation to obtain a synchronization position of the serving cell; and if the current switching condition is met, reporting a switching request to a network side.
Wherein,% is the modulo operator; and X is a preset measuring period. Preferably, the X may be set to 8, compatible with existing systems.
When the frame number SFN% X is 1, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the serving cell in the synchronization subband s0, and calculates a reference signal received power value RSRP of the serving cell according to the downlink antenna data received this time0(ii) a According to the RSRP0Updating the reference signal received power average value of the serving cell
After the current frame is received, switching a channel for receiving the synchronous sub-band antenna data to a synchronous sub-band s1 of an adjacent cell 1; and if the switching condition is met currently, reporting a switching request to a network side.
When the frame number SFN% X is 2, the UE receives downlink antenna data in the synchronization frame of the synchronization subband s1, and performs timing estimation to obtain the synchronization position of the neighboring cell 1; and if the switching condition is met currently, reporting a switching request to a network side.
When the frame number SFN% X is 3, the UE is positioned in the same neighbor cell 1 according to the synchronous position of the neighbor cell 1Receiving downlink antenna data by a broadcast frame of a step band s1, and calculating the current reference signal received power value RSRP of the adjacent cell 1 according to the downlink antenna data received this time1(ii) a According to the RSRP1Updating the average value of the reference signal received power of the adjacent area 1
After the reception of the current frame is completed, switching a channel for receiving the synchronous subband antenna data to a synchronous subband s2 of an adjacent cell 2; and if the switching condition is met currently, reporting a switching request to a network side.
When the frame number SFN% X is 4, the UE receives downlink antenna data in the synchronization frame of the synchronization subband s2, and performs timing estimation to obtain the synchronization position of the neighboring cell 2; and if the switching condition is met currently, reporting a switching request to a network side.
When the frame number SFN% X is 5, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the neighboring cell 2 in the synchronization subband s2, and calculates the current reference signal received power value RSRP of the neighboring cell 2 according to the downlink antenna data received this time2(ii) a According to the RSRP2And updating the reference signal received power average value of the adjacent area 2
Switching a channel for receiving the synchronous subband antenna data to a synchronous subband s0 of the serving cell after said receiving of the current frame is completed; and if the switching condition is met currently, reporting a switching request to a network side.
In practical applications, a person skilled in the art may set a matching measurement rule according to application requirements of an actual communication system, and since the specific change of the measurement rule does not affect the implementation of the object of the present invention, further description is omitted here.
In addition, in the above method, for
And
the updating of (2) can be realized by adopting the existing method, for example, the updating can be realized based on the formula:
updating the average value of the received power of the reference signal of the cell, wherein the weight factor alpha is configurable,
is the average value of the received power of the reference signal of the cell before updating, RSRPCurrent frameFor the current cell reference signal received power value,
the updated cell reference signal received power average value is obtained.
Preferably, the reporting condition of the handover request may be set as follows: and when the current measurement report period reaches a preset measurement report period, the difference between the average value of the reference signal received power of the adjacent cell 1 or the adjacent cell 2 and the average value of the reference signal received power of the serving cell is greater than a preset switching threshold.
Fig. 2 is a cell measurement apparatus corresponding to the method, as shown in fig. 2, including:
a modulation coding mode determining unit, configured to determine, at each radio frame, an order of a modulation coding mode of a current service subband of the UE;
and the cell measuring unit is used for executing corresponding cell measuring operation according to the frame number of the wireless frame according to a preset measuring rule only when the order is less than or equal to a preset threshold value.
Preferably, the threshold is 5.
Preferably, when the three-cell networking mode is adopted, the measurement rule includes:
when the frame number SFN% X is 0, the UE receives downlink antenna data at a synchronization frame of a synchronization subband s0 of the serving cell, and performs timing estimation to obtain a synchronization position of the serving cell; wherein,% is the modulo operator; x is a preset measurement period; if the current switching condition is met, reporting a switching request to a network side;
when the frame number SFN% X is 1, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the serving cell in the synchronization subband s0, and calculates a reference signal received power value RSRP of the serving cell according to the downlink antenna data received this time0(ii) a According to the RSRP0Updating the reference signal received power average value of the serving cell
After the current frame is received, switching a channel for receiving the synchronous sub-band antenna data to a synchronous sub-band s1 of an adjacent cell 1; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 2, the UE receives downlink antenna data in the synchronization frame of the synchronization subband s1, and performs timing estimation to obtain the synchronization position of the neighboring cell 1; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 3, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the neighboring cell 1 in the synchronization subband s1, and calculates the current reference signal received power value RSRP of the neighboring cell 1 according to the downlink antenna data received this time1(ii) a According to the RSRP1Updating the average value of the reference signal received power of the adjacent area 1
After the reception of the current frame is completed, switching a channel for receiving the synchronous subband antenna data to a synchronous subband s2 of an adjacent cell 2; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 4, the UE receives downlink antenna data in the synchronization frame of the synchronization subband s2, and performs timing estimation to obtain the synchronization position of the neighboring cell 2; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 5, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the neighboring cell 2 in the synchronization subband s2, and calculates the current reference signal received power value RSRP of the neighboring cell 2 according to the downlink antenna data received this time2(ii) a According to the RSRP2And updating the reference signal received power average value of the adjacent area 2
Switching a channel for receiving the synchronous subband antenna data to a synchronous subband s0 of the serving cell after said receiving of the current frame is completed; and if the switching condition is met currently, reporting a switching request to a network side.
Preferably, X is 8.
Preferably, the reporting condition includes:
and when the current measurement report period reaches a preset measurement report period, the difference between the average value of the reference signal received power of the adjacent cell 1 or the adjacent cell 2 and the average value of the reference signal received power of the serving cell is greater than a preset switching threshold.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method of cell measurement, comprising:
in each wireless frame, User Equipment (UE) determines the order of the modulation coding mode of the current service sub-band; executing corresponding cell measurement operation according to the frame number of the wireless frame according to a preset measurement rule only when the order is less than or equal to a preset threshold value;
when the three-cell networking mode is adopted, the measurement rule comprises:
when the frame number SFN% X is 0, the UE receives downlink antenna data at a synchronization frame of a synchronization subband s0 of the serving cell, and performs timing estimation to obtain a synchronization position of the serving cell; wherein,% is the modulo operator; x is a preset measurement period; if the current switching condition is met, reporting a switching request to a network side;
when the frame number SFN% X is 1, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the serving cell in the synchronization subband s0, and calculates a reference signal received power value RSRP of the serving cell according to the downlink antenna data received this time0(ii) a According to the RSRP0Updating the reference signal received power average value of the serving cell
After the current frame is received, switching a channel for receiving the synchronous sub-band antenna data to a synchronous sub-band s1 of an adjacent cell 1; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 2, the UE receives downlink antenna data in the synchronization frame of the synchronization subband s1, and performs timing estimation to obtain the synchronization position of the neighboring cell 1; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 3, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the neighboring cell 1 in the synchronization subband s1, and calculates the current reference signal received power value RSRP of the neighboring cell 1 according to the downlink antenna data received this time1(ii) a According to the RSRP1Updating the average value of the reference signal received power of the adjacent area 1
After the reception of the current frame is completed, switching a channel for receiving the synchronous subband antenna data to a synchronous subband s2 of an adjacent cell 2; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 4, the UE receives downlink antenna data in the synchronization frame of the synchronization subband s2, and performs timing estimation to obtain the synchronization position of the neighboring cell 2; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 5, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the neighboring cell 2 in the synchronization subband s2, and calculates the current reference signal received power value RSRP of the neighboring cell 2 according to the downlink antenna data received this time2(ii) a According to the RSRP2And updating the reference signal received power average value of the adjacent area 2
Switching a channel for receiving the synchronous subband antenna data to a synchronous subband s0 of the serving cell after said receiving of the current frame is completed; if the switching condition is met currently, reporting a switching request to a network side;
and X is a positive integer.
2. The method of claim 1, wherein the threshold is 5.
3. The method of claim 1, wherein X-8.
4. The method of claim 1, wherein the reporting condition comprises:
and when the current measurement report period reaches a preset measurement report period, the difference between the average value of the reference signal received power of the adjacent cell 1 or the adjacent cell 2 and the average value of the reference signal received power of the serving cell is greater than a preset switching threshold.
5. A cell measurement apparatus, comprising:
a modulation coding mode determining unit, configured to determine, at each radio frame, an order of a modulation coding mode of a current service subband of the UE;
the cell measurement unit is used for executing corresponding cell measurement operation according to the frame number of the wireless frame according to a preset measurement rule only when the order is less than or equal to a preset threshold; when the three-cell networking mode is adopted, the measurement rule comprises:
when the frame number SFN% X is 0, the UE receives downlink antenna data at a synchronization frame of a synchronization subband s0 of the serving cell, and performs timing estimation to obtain a synchronization position of the serving cell; wherein,% is the modulo operator; x is a preset measurement period; if the current switching condition is met, reporting a switching request to a network side;
when the frame number SFN% X is 1, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the serving cell in the synchronization subband s0, and calculates a reference signal received power value RSRP of the serving cell according to the downlink antenna data received this time0(ii) a According to the RSRP0Updating the reference signal received power average value of the serving cell
After the current frame is received, switching a channel for receiving the synchronous sub-band antenna data to a synchronous sub-band s1 of an adjacent cell 1; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 2, the UE receives downlink antenna data in the synchronization frame of the synchronization subband s1, and performs timing estimation to obtain the synchronization position of the neighboring cell 1; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 3, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the neighboring cell 1 in the synchronization subband s1, and calculates the current reference signal received power value RSRP of the neighboring cell 1 according to the downlink antenna data received this time1(ii) a According to the RSRP1Updating the average value of the reference signal received power of the adjacent area 1
After the reception of the current frame is completed, switching a channel for receiving the synchronous subband antenna data to a synchronous subband s2 of an adjacent cell 2; if the switching condition is satisfied currently, the network is switched toThe network side reports the switching request;
when the frame number SFN% X is 4, the UE receives downlink antenna data in the synchronization frame of the synchronization subband s2, and performs timing estimation to obtain the synchronization position of the neighboring cell 2; if the switching condition is met currently, reporting a switching request to a network side;
when the frame number SFN% X is 5, the UE receives downlink antenna data according to the broadcast frame of the synchronization position of the neighboring cell 2 in the synchronization subband s2, and calculates the current reference signal received power value RSRP of the neighboring cell 2 according to the downlink antenna data received this time2(ii) a According to the RSRP2And updating the reference signal received power average value of the adjacent area 2
Switching a channel for receiving the synchronous subband antenna data to a synchronous subband s0 of the serving cell after said receiving of the current frame is completed; if the switching condition is met currently, reporting a switching request to a network side;
and X is a positive integer.
6. The apparatus of claim 5, wherein the threshold is 5.
7. The apparatus of claim 5, wherein X-8.
8. The apparatus of claim 5, wherein the reporting condition comprises:
and when the current measurement report period reaches a preset measurement report period, the difference between the average value of the reference signal received power of the adjacent cell 1 or the adjacent cell 2 and the average value of the reference signal received power of the serving cell is greater than a preset switching threshold.
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| CN105323726A (en) * | 2014-07-28 | 2016-02-10 | 中兴通讯股份有限公司 | Autonomous switching and switching processing method of terminal in cluster group and apparatus thereof |
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