CN102256319A - Communication device and method for selecting communication cell in communication system - Google Patents

Abstract

The invention discloses a communication device and a method for selecting a communication cell in a communication system. The communication frequency band supported by the communication system includes a plurality of communication frequency points, and the method includes: measuring one of the plurality of communication frequency points corresponding to The pilot signal received power or reference signal received power of a plurality of sub-districts; Judging whether the maximum value in the measured pilot signal received power or reference signal received power exceeds the first threshold value, if not, then measure the multiple The pilot signal received power or the reference signal received power of a plurality of sub-districts corresponding to other communication frequency points of a communication frequency point, and get back to the step of said judgment; The power or the total received power of the communication cell corresponding to the received power of the reference signal; and selecting the current serving cell based on the determined total received power.

Description

Communication device and method for selecting a communication cell in a communication system

technical field

The content disclosed in this application relates to a communication device and a method for selecting a communication cell in a communication system.

Background technique

At present, when the terminal selects a communication cell, it only measures the Signal Received Power Reference (RSRP). As long as the RSRP of the cell corresponding to the measurement frequency point meets a certain strength requirement, the terminal will be connected to the cell. It is not optimal to access a cell simply based on the measurement of RSRP, and often cannot guarantee the performance of the terminal when it is working normally.

In addition, there is also a technical solution in the prior art that simply uses the pilot signal-to-interference ratio to select the primary cell. This technical solution needs to traverse all the carrier frequencies of the frequency band supported by the terminal, which will lead to cell search and access to the cell. The process is lengthened, which affects the user experience. In addition, this solution is not suitable for the LTE (Long Term Evolution) system, because the LTE system uses Reference Signal Received Quality (RSRQ) as the evaluation of the received quality of the reference signal instead of the traditional pilot signal-to-interference ratio.

Contents of the invention

On the one hand, the present application discloses a method for selecting a communication cell in a communication system. The communication frequency band supported by the communication system includes multiple communication frequency points. The method includes:

Measuring pilot signal received power (Received Signal Code Power, RSCP) or reference signal received power (RSRP) of multiple cells corresponding to one of the multiple communication frequency points;

judging whether the largest value of the measured pilot signal received power or reference signal received power exceeds a first threshold value,

If not, measure the pilot signal received power or reference signal received power of multiple cells corresponding to other communication frequency points of the multiple communication frequency points, and return to the step of judging;

If so, determining the total received power of the communication cell corresponding to the received power of the pilot signal or the received power of the reference signal exceeding the first threshold; and

A current serving cell is selected based on the determined total received power.

As an option, the methods described above may include:

Measuring pilot signal received power or reference signal received power of multiple cells corresponding to the multiple communication frequency points;

determining, from the measured pilot signal received power or reference signal received power, pilot signal received power or reference signal received power exceeding a preset first threshold;

Measuring the total received power of the communication cell corresponding to the determined pilot signal received power or reference signal received power; and

The current cell is selected as the serving cell based on the determined total received power.

A communication device provided according to another aspect of the present invention may include:

A measuring unit, configured to measure pilot signal received power or reference signal received power of multiple cells corresponding to one of the multiple communication frequency points supported by the communication device;

a judging unit, judging that the largest value of the measured pilot signal received power or reference signal received power exceeds the first threshold; and

The RSSI determining unit determines the total received power of the communication cell whose pilot signal received power or reference signal received power exceeds the first threshold; and

The cell selection unit selects the current cell as the serving cell based on the determined total received power.

As an option, the above means may include:

A measuring unit, configured to measure pilot signal received power or reference signal received power of multiple cells corresponding to the multiple communication frequency points;

A judging unit, judging from the measured pilot signal received power or reference signal received power that exceeds the preset first threshold value;

The RSSI determination unit determines the total received power of the communication cell corresponding to the received power of the pilot signal or the received power of the reference signal exceeding the preset first threshold value; and

The cell selection unit selects the current cell as the serving cell based on the determined total received power.

According to the above-mentioned communication device and the method for selecting a communication cell in a communication system, it may have at least one of the following beneficial effects:

1. Compared with the method of simply measuring the received strength of the pilot signal or the received strength of the reference symbol, it can effectively reduce the current high quality strength of the received signal of the pilot/reference signal caused by only measuring the strength of the pilot signal and choosing to reside in the cell, but the traffic channel The receiving quality of the terminal is very poor, and the probability that the terminal cannot work normally can ensure that the channel quality of the service cell selected by the terminal is better;

2. Compared with the method of simply measuring the signal-to-interference ratio of pilot signal reception or the quality of reference symbol reception, it can effectively reduce the cell search time and measurement complexity; or

3. Since RSRP/RSCP is the quantity of baseband measurement, after receiving the radio frequency signal, it needs to be down-converted to the baseband for physical layer demodulation and decoding, while RSSI is the quantity of radio frequency measurement. When doing RSRP/RSCP measurement, minor changes The RSSI measurement can be realized, and the complexity of the terminal is slightly increased.

Description of drawings

FIG. 1 is a method for selecting a communication cell in a communication system according to an embodiment of the present application;

FIG. 2 is a schematic diagram showing communication frequency points in the TD-LTE frequency band;

FIG. 3 is a method for selecting a communication cell in a communication system according to another embodiment of the present application;

FIG. 4 is a functional structural block diagram of a communication device according to an embodiment of the present application; and

FIG. 5 is a block diagram of the functional structure of the cell selection unit shown in FIG. 4 .

Detailed ways

The method and communication settings for selecting a communication cell in a communication system according to the embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 shows a method 1000 for selecting a communication cell in a communication system according to an embodiment of the present application. As shown in FIG. 1 , in step S101 , the terminal sequentially or randomly selects and measures one frequency point among multiple communication frequency points supported by the communication system. For example, as known in the art, 2300-2400 MHz is an important frequency band for TD-LTE deployment, as shown in FIG. 2 . For the purpose of illustration, Fig. 2 exemplarily configures five 20MHz communication frequency points f1, f2, f3, f4 and f5 on the system side of the 2300-2400MHz frequency band. Wherein each frequency point supports multiple communication cells, for example, it is assumed that f5 corresponds to three communication cells cell 1, cell 2 and cell 3 (not shown). As an example, frequency point f5 is selected in this step.

In step S102, the pilot signals RSCP or RSRP of multiple cells corresponding to the selected communication frequency point are measured. For example, measure the pilot signal RSCP or RSRP of cell 1, cell2 and cell3 corresponding to the communication frequency point f5 respectively.

In step S103, it is judged whether the maximum value of RSCP or RSRP measured in step S102 exceeds a first threshold value. For example, it is judged whether the RSCP or RSRP of cell 1, cell 2 and cell 3 corresponding to the communication frequency point f5 exceeds the first threshold value. In one embodiment, a judging manner in an existing standard may be used to judge whether the RSCP or RSRP exceeds the first threshold. The first threshold can be preset according to existing standards, for example, the judgment method in Chapter 5.2.3.2 Cell Selection Criterion of 3GPP TS36.304.

If the result of judgment in step S103 is yes, then measure the total received power (Received Signal Strength Indication, RSSI) of the communication cell with the largest RSCP or RSRP in step S104. For example, in step S103, it is determined that the RSCP or RSRP corresponding to cell 2 is the largest and exceeds the first threshold value, then the total received power RSSI of cell 2 is determined in this step.

Next, in steps S105-106, based on the RSSI measured in step S104, it is determined whether to select the communication cell exceeding the maximum RSCP or RSRP as the current serving cell. Specifically, in step S105, determine the pilot signal received quality (Ec/N0) or the reference signal received quality (RSRQ) of this communication cell (such as above-mentioned cell2); Then judge determined Ec/N0 in step S106 Or whether the RSRQ exceeds the preset second threshold value, and if so, select the communication cell as the current serving cell. Wherein, the second threshold value is configurable, specifically, it can be configured according to network planning experience value, and can also be configured according to parameters, for example, according to PLMN priority, terminal power level, etc., and wherein, Ec/N0 and RSRQ can be determined according to formulas 1) and 2)1.

Ec/N0＝RSCP/RSSI Formula 1)

RSRQ＝N×RSRP/RSSI Formula 2)

Where N is the number of resource blocks (Resource Block, RB) of the RSSI measurement bandwidth.

Also take cell 2 as an example, if Ec/N0 or RSRQ in cell 2 exceeds the preset second threshold value, cell 2 is selected as the current serving cell.

If the result determined in the above step S103 is that a plurality of RSCPs or RSRPs measured in the step S102 do not exceed the first threshold value, then in step S107, it is determined whether there are untraversed support frequency points, and if so, the In step S108, select the next frequency point among multiple communication frequency points, such as f4, and return to step S102; otherwise, the selection of the communication cell fails, for example, a message of cell selection failure is optionally given in step S111.

If the result determined in the above step S105 is that the determined Ec/N0 or RSRQ does not exceed the preset second threshold value, then determine in step S109 whether there are untraversed support frequency points, and if so, perform step S108, otherwise, in step S110, select the cell with the best Ec/N0 or RSRQ from all the measured cells as the current serving cell or notify the terminal that the cell selection fails.

The following describes a method 2000 for selecting a communication cell in a communication system according to another embodiment of the present application with reference to FIG. 3 .

As shown in FIG. 3 , in step S201 , one frequency point among multiple communication frequency points supported by the measurement communication system is randomly selected. In step S202, the pilot signals RSCP or RSRP of multiple cells corresponding to the selected communication frequency point are measured. In step S203, it is judged whether the maximum RSCP or RSRP measured in step S202 exceeds a first threshold. If the result of the judgment is yes, measure the RSSI of the communication cell corresponding to the RSCP or RSRP exceeding the first threshold in step S204. The above steps 201-204 are the same as steps S101-104, so they will not be repeated here.

Then, in step S205, it is determined whether there are untraversed support frequency points, if not, then in step S207, based on the RSSI calculated in step S204, the Ec/N of each cell is calculated respectively by the above formulas 1) and 2). or RSRQ, and select the cell with the best Ec/N0 or RSRQ from all measured cells as the current serving cell; otherwise, select the next frequency point in step S206 and return to step S202 for processing.

If the result determined in the above step S203 is that the maximum RSCP or RSRP measured at all frequency points measured in the step S202 does not exceed the first threshold value, then determine in step S205 whether there are untraversed support frequency points, If not, in step S207, notify the terminal that the cell selection fails; otherwise, in step S206, select the next frequency point among the multiple communication frequency points, and return to step S202.

A communication device 4000 capable of implementing the above processes 1000 and 2000 according to an embodiment of the present application will be described below with reference to FIG. 4 . In one embodiment, the communication device 4000 may be an LTE terminal.

As shown in FIG. 4 , the communication device 4000 includes a measuring unit 401 , a judging unit 402 , an RSSI determining unit 403 and a cell selecting unit 404 .

In one embodiment, the measurement unit 401 measures pilot signal received power or reference signal received power of multiple cells corresponding to one of the multiple communication frequency points supported by the communication device 4000 .

Judging unit 402 judges whether the largest value in the measured pilot signal received power or reference signal received power exceeds the first threshold value; power or the total received power of the communication cell corresponding to the received power of the reference signal, and the cell selection unit 404 selects the current serving cell based on the determined total received power. If the judging unit 402 judges that the largest value of the measured pilot signal received power or reference signal received power does not exceed the first threshold value, the measuring unit 401 measures multiple cells corresponding to other communication frequency points of multiple communication frequency points The received power of the pilot signal or the received power of the reference signal, and then the judging unit 402 performs the above judging process.

According to an embodiment of the present application, the cell selection unit 404 determines the pilot signal reception quality or the reference signal reception quality of the communication cell with the maximum reception power or reference signal reception power based on the total reception power determined by the RSSI determination unit 403 . If the judgment unit 402 judges that the determined pilot signal reception quality or reference signal reception quality exceeds the second threshold value, the cell selection unit 404 determines the communication cell with the maximum reception power or reference signal reception power based on the total reception power Pilot signal reception quality or reference signal reception quality. Wherein, if the judgment unit 402 judges that the determined pilot signal reception quality or reference signal reception quality does not exceed the second threshold value, the cell selection unit 404 selects the communication channel with the best pilot signal reception quality or reference signal reception quality. The cell serves as the current serving cell.

If the reception quality of the pilot signal or the reception quality of the reference signal in the communication cells corresponding to the multiple communication frequency points does not exceed the second threshold value, the cell selection unit 404 gives a prompt message that the selection of the communication cell fails.

Specifically, as shown in FIG. 5 , the cell selection unit 404 may further include an Ec/N0 or RSRQ determination module 4041 and a selection module 4042 . Wherein, the Ec/N0 or RSRQ determining module 4041 determines the Ec/N0 or RSRQ of the communication cell corresponding to the pilot signal exceeding the first threshold based on the total received power (RSSI). The selection module 4042 selects the communication cell corresponding to the highest Ec/N0 or RSRQ value as the current serving cell.

As an option, after the Ec/N0 or RSRQ determination module 4041 determines the Ec/N0 or RSRQ of the communication cell corresponding to the pilot signal exceeding the first threshold based on the total received power (RSSI), the selection module 4042 judges Whether the determined Ec/N0 or RSRQ exceeds the second threshold value, if yes, then select the communication cell corresponding to the pilot signal RSCP or RSRP exceeding the first threshold value as the current serving cell; if not, select the next communication cell The frequency point is used as the measurement object, and the above processing is repeatedly performed by the measuring unit 401 , the judging unit 402 , the RSSI determining unit 403 , and the cell selecting unit 404 . In addition, if the result of measurement on all communication frequency points supported by the communication system is that the Ec/N0 or RSRQ of no cell is higher than the second threshold, select the cell with the highest Ec/N0 or RSRQ value as the current serving cell, or directly notify The terminal cell selection failed.

Also take the five communication frequency points f1, f2, f3, f4 and f5 shown in FIG. 2 as an example. For example, the measuring unit 401 first selects the frequency point f5 and measures pilot signals RSCP or RSRP of multiple cells corresponding to it. For example, measure the pilot signal RSCP or RSRP of cell 1, cell 2 and cell 3 corresponding to communication frequency f5. The judging unit 402 judges whether the maximum value of the pilot signal RSCP or RSRP measured in the unit 401 exceeds a preset first threshold value. For example, the judging unit 402 judges that the RSCP or RSRP corresponding to the cell 2 is the largest and exceeds the first threshold value, then the RSSI determining unit 403 determines the total received power RSSI of the cell 2. The Ec/N0 or RSRQ determination module 4041 of the cell selection unit 404 calculates the Ec/N0 or RSRQ in cell2 according to the determined RSSI, and further judges whether the Ec/N0 or RSRQ in cell2 exceeds the preset second threshold Limit value, if yes, the control unit 4042 selects cell 2 as the current serving cell; otherwise, selects other frequency points such as f4 to repeat the above operations.

The above is only the preferred implementation mode of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the application, or directly or indirectly used in other related All technical fields are equally included in the patent protection scope of the present application.

Claims (14)

1. A method for selecting a communication cell in a communication system, the communication frequency band supported by the communication system includes a plurality of communication frequency points, the method comprising: Measuring pilot signal received power or reference signal received power of multiple cells corresponding to one of the multiple communication frequency points; judging whether the largest value of the measured pilot signal received power or reference signal received power exceeds a first threshold value, If not, measure the pilot signal received power or reference signal received power of multiple cells corresponding to other communication frequency points of the multiple communication frequency points, and return to the step of judging; If so, determining the total received power of the communication cell corresponding to the received power of the pilot signal or the received power of the reference signal exceeding the first threshold; and The current cell is selected as the serving cell based on the determined total received power. 2. The method of claim 1, wherein the step of selecting comprises: determining the pilot signal reception quality or reference signal reception quality of the communication cell having the maximum reception power or reference signal reception power based on the total reception power; judging that the determined pilot signal reception quality or reference signal reception quality exceeds a second threshold; and The communication cell corresponding to the received power of the pilot signal or the received power of the reference signal is selected as the serving cell. 3. The method of claim 1, wherein the step of selecting comprises: determining the pilot signal reception quality or reference signal reception quality of the communication cell having the maximum reception power or reference signal reception power based on the total reception power; judging that the determined pilot signal reception quality or reference signal reception quality does not exceed a second threshold; and Select the communication cell with the best pilot signal reception quality or reference signal reception quality as the serving cell. 4. The method according to claim 1, wherein, if the received quality of the pilot signal or the received quality of the reference signal in the corresponding communication cell in the plurality of communication frequency points does not exceed the second threshold value, then Give a prompt message that the selection of the communication cell fails. 5. A method for selecting a communication cell in a communication system, the communication frequency band supported by the communication system includes a plurality of communication frequency points, the method comprising: Measuring pilot signal received power or reference signal received power of multiple cells corresponding to the multiple communication frequency points; determining, from the measured pilot signal received power or reference signal received power, pilot signal received power or reference signal received power exceeding a preset first threshold; Measuring the total received power of the communication cell corresponding to the determined pilot signal received power or reference signal received power; and The current cell is selected as the serving cell based on the determined total received power. 6. The method of claim 5, wherein the step of selecting the current serving cell based on the determined total received power comprises: determining a respective corresponding pilot signal reception quality or reference signal reception quality based on the determined total reception power; and The communication cell corresponding to the highest pilot signal reception quality or reference signal reception quality is selected as the serving cell. 7. A communication device comprising: A measuring unit, configured to measure pilot signal received power or reference signal received power of multiple cells corresponding to one of the multiple communication frequency points supported by the communication device; a judging unit, judging that the largest value of the measured pilot signal received power or reference signal received power exceeds the first threshold; and The RSSI determining unit determines the total received power of the communication cell whose pilot signal received power or reference signal received power exceeds the first threshold; and The cell selection unit selects the current cell as the serving cell based on the determined total received power. 8. The communication device of claim 7, wherein: The cell selection unit determines the pilot signal reception quality or reference signal reception quality of the communication cell having the maximum reception power or reference signal reception power based on the total reception power; Wherein, if the judging unit judges that the determined received quality of the pilot signal or the received quality of the reference signal exceeds the second threshold value, the cell selection unit selects the communication cell corresponding to the received power of the pilot signal or the received power of the reference signal as a service area. 9. The communication device according to claim 7, wherein the cell selection unit determines the pilot signal reception quality or the reference signal reception quality of the communication cell having the maximum reception power or the reference signal reception power based on the total reception power; Wherein, if the judging unit judges that the determined pilot signal reception quality or reference signal reception quality does not exceed the second threshold value, the cell selection unit selects the communication channel with the best pilot signal reception quality or reference signal reception quality. The cell serves as the serving cell. 10. The communication device according to claim 7, if neither the received quality of the pilot signal nor the received quality of the reference signal in the corresponding communication cell in the plurality of communication frequency points exceeds the second threshold value, then the The cell selection unit gives a prompt message that the selection of the communication cell fails. 11. The communication device according to claim 7, wherein the cell selection unit further comprises: Ec/N0 or RSRQ determination module, based on the total received power, determines the pilot signal reception quality or reference signal reception quality of the communication cell corresponding to the pilot signal exceeding the first threshold; and The selection module judges that the determined received quality of the pilot signal or the received quality of the reference signal exceeds the second threshold value, and selects the communication cell as the current serving cell. 12. A communication device comprising: A measuring unit, configured to measure pilot signal received power or reference signal received power of multiple cells corresponding to the multiple communication frequency points; A judging unit, judging from the measured pilot signal received power or reference signal received power that exceeds the preset first threshold value; The RSSI determination unit determines the total received power of the communication cell corresponding to the received power of the pilot signal or the received power of the reference signal exceeding the preset first threshold value; and The cell selection unit selects the current serving cell based on the determined total received power. 13. The communication device according to claim 12, wherein the cell selection unit determines the corresponding pilot signal reception quality or reference signal reception quality based on the determined total reception power, and selects the highest pilot signal reception quality or The communication cell corresponding to the received quality of the reference signal is used as the current serving cell. 14. The communication device according to claim 12, wherein the cell selection unit further comprises: Ec/N0 or RSRQ determination module, based on the total received power, determines the pilot signal reception quality or reference signal reception quality of the communication cell corresponding to the pilot signal exceeding the first threshold; and The selection module selects the communication cell corresponding to the highest pilot signal reception quality or reference signal reception quality as the current serving cell.

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