CN100459815C - Method and system for random access of user equipment - Google Patents

Abstract

The present invention discloses a UE random access method. In the method, a distance threshold value is set in advance for the distance between UE and Node B of a base station, and a high increase value is set for the chip increase rate, including: Node B measurement and When the distance of the current UE is determined to be greater than the distance threshold value, the propagation delay value Pd is calculated according to the set high increase value and sent to the RNC; the RNC receives the Pd value from the Node B, according to the set value The set high increase value determines the distance range interval between the current UE and the Node B reporting the Pd value. The invention also discloses a UE random access system, including Node B and RNC. The method and system provided by the present invention can increase the access radius, and can ensure the positioning accuracy of the UE that is closer to the Node B.

Description

Method and system for random access of user equipment

technical field

The present invention relates to mobile communication technology, in particular to a method and system for random access of user equipment (UE, UserEquipment).

Background technique

In the initial protocol formulation of Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), the maximum radius of the cell is set to 60 kilometers, that is, the coverage of the base station (Node B) in the WCDMA system can only reach a maximum radius of The range of 60 kilometers, therefore, can only complete WCDMA system access for UEs within 60 kilometers. However, in the actual application of WCDMA, some occasions require a larger access radius, for example, 200 kilometers. At this time, it is necessary to complete access to UEs within 200 kilometers. However, the existing propagation delay (PD, Propagation Delay) cell length of one of the cells used to complete the access is 8 bits (bit), a total of ^28-1 =255 cell units, according to the provisions of the WCDMA protocol, Every increase of 1 cell unit in the measured value corresponds to an increase of 3 chips (chip) length delay, that is, the chip increase rate is 3, and the delay distance corresponding to a chip length is 78 meters, then 255 cells The delay distance corresponding to the unit is at most (2 ⁸ -1)×3×78=59670 meters=59.67 kilometers. Therefore, the maximum distance information that can be carried by this cell is 59.67 kilometers. For UEs with a distance greater than 59.67 kilometers, the propagation delay cell will overflow during the initial random access process. It can be seen that in the prior art, WCDMA system access cannot be completed for a UE located 60 kilometers away.

In view of this situation, taking the case where the access radius is 200 kilometers as an example, a current solution is to set the time delay corresponding to an increase of 3 chip lengths for every increase of 1 cell unit in the original measurement value as: measurement Every time the value increases by 1 cell unit, the delay of 10 chip lengths will be increased, that is, the chip increase rate is set to 10. According to the above calculation method, access radius = (2 ⁸ -1) × 10 × 78 = 198900 meters ≈ 199 kilometers, this solution can increase the access radius to 199 kilometers. However, in this solution, since the delay corresponding to the unit increase of the measurement value increases by more than three times, when the UE randomly accesses, if the uplink signal Time of Arrival (TOA, Time of Arrival) method is used for positioning, the current The distance range interval between the UE and the Node B that reported the Pd value is: ((Pd-1)×10×78, Pd×10×78); and for the case where the chip increase rate is 3, the obtained current UE The distance range interval between the Node B and the Node B that reported the Pd value is: ((Pd-1)×3×78, Pd×3×78). Comparing the two range intervals, it is obvious that the scheme greatly reduces the The positioning accuracy of TOA. Because the TOA method finally determines the location of the current UE by taking the intersection of the distance range intervals between the current UE and different Node Bs, different scenarios have different positioning accuracy requirements for positioning using the TOA method. For areas with dense cells, such as dense urban areas, because of the dense Node Bs, it is easier to use the TOA method to achieve positioning, so the positioning accuracy of TOA is very high; and for wide-coverage cells, such as remote suburbs or rural areas, Node Bs are sparsely distributed. The communication location is often located in an open area, where it is easy to receive a Global Positioning System (GPS, Global Position System) signal and realize GPS positioning, so the requirement for TOA positioning accuracy is not high. In this solution, the areas with dense Node Bs, that is, the UEs that are relatively close to the Node B, have high requirements on TOA positioning accuracy, so there is a defect of low positioning accuracy.

Contents of the invention

In view of this, on the one hand, the present invention provides two UE random access methods, which can increase the access radius and ensure the positioning accuracy of UEs that are closer to the Node B.

Another aspect of the present invention provides a UE random access system, which can increase the access radius and ensure the positioning accuracy of UEs that are closer to the Node B.

The first UE random access method provided by the present invention is realized through the following technical solutions:

In this method, the distance threshold value is set in advance to the distance between the UE and the base station Node B, and a high increase value is set to the chip increase rate, and the method includes the following steps:

A. Node B measures the distance with the current UE, and when the determined distance value is greater than the distance threshold value, calculates the propagation delay value Pd according to the set high increase value and sends it to the radio network controller RNC; When the obtained distance value is less than or equal to the distance threshold value, calculate the propagation delay value Pd according to the low increase value and send it to the RNC;

B. RNC receives the Pd value from Node B, compares the Pd value with the cell unit value Pd0 of the propagation delay cell corresponding to the distance threshold value, and determines that the Pd value is less than or equal to the Pd0 , determine the distance range interval between the current UE and the Node B reporting the Pd value according to the low increase value, and determine the distance between the current UE and the reported Node B according to the set high increase value when the Pd value is determined to be greater than the Pd0. The distance range interval between Node Bs of the Pd value, and RNC interacts with Node Bs and UEs to perform random access.

Wherein, sending the propagation delay value Pd to the RNC as described in step A is: encapsulating the Pd value in a propagation delay cell, and sending it to the RNC through an information frame carrying the cell;

Then in the step B, the RNC receives the Pd value from the Node B: the RNC receives the information frame from the Node B, and resolves the Pd value from the propagation delay cell therein.

Wherein, the propagation delay value Pd calculated according to the set high increase value described in step A is: the chip length corresponding to the distance measured by Node B is subtracted from the chip length corresponding to the distance threshold value, and then divided by Set the high increase value and round it up, and then add the cell unit value Pd0 of the propagation delay cell corresponding to the distance threshold value;

As described in step B, according to the set high increase value, determine the distance range interval between the current UE and the Node B reporting the Pd value: determine the lower limit value of the distance: ((Pd-1-Pd0) × high increase value+the chip length corresponding to the distance threshold value)×78 meters, and the upper limit value of the determined distance is: ((Pd-Pd0)×high increase value+the chip length corresponding to the distance threshold value)×78 meters.

Wherein, the propagation delay value Pd calculated according to the set low increase value as described in step A is: the chip length corresponding to the distance measured by the Node B is divided by the set low increase value and rounded;

In step B, according to the set low increase value, determine the distance range interval between the current UE and the Node B reporting the Pd value: determine the lower limit of the distance: (Pd-1) × low increase value × 78 meters, determine the upper limit value of the distance: Pd × low increase value × 78 meters.

Wherein, the preset distance threshold value may be: a delay distance corresponding to a length of 300 chips, and the preset high increase value may be: 15.

The second UE random access method provided by the present invention is realized through the following technical solutions:

Set the first distance threshold value and the second distance threshold value for the distance between the UE and the base station Node B in advance, and the second distance threshold value is greater than the first distance threshold value, and set a high increase rate for the chip increase rate value and intermediate added value, the method includes the following steps:

A. Node B measures the distance from the current UE, and when the determined distance value is greater than the second distance threshold value, calculates the propagation delay value Pd according to the set high increase value; when the determined distance value is greater than the set When the first distance threshold value is less than or equal to the second distance threshold value, the propagation delay value Pd is calculated according to the set intermediate increase value; when the determined distance value is less than or equal to the first distance threshold value , calculate the propagation delay value Pd according to the set low added value, and then the Node B sends the calculated Pd value to the RNC;

B. RNC receives the Pd value from Node B, and the Pd value is respectively the cell unit value Pd1 of the propagation delay cell corresponding to the first distance threshold value, and the propagation delay cell corresponding to the second distance threshold value If the Pd value is greater than Pd2, then determine the distance range interval between the current UE and the Node B that reported the Pd value according to the set high increase value; if the Pd value is greater than Pd1 and less than or equal to Pd2, then determine the distance range between the current UE and the Node B reporting the Pd value according to the set intermediate increase value; The distance range interval between Node Bs of the Pd value; and RNC interacts with Node Bs and UEs to perform random access.

A UE random access system provided by the present invention is realized through the following technical solutions:

The system includes: Node B and RNC, wherein,

The Node B is used to measure the distance between itself and the UE when the UE randomly accesses, and when the obtained distance value is determined to be greater than the preset distance threshold value, calculate the propagation delay value Pd according to the preset high increase value and Send to RNC; When determining that the obtained distance value is less than or equal to the preset distance threshold value, calculate the propagation delay value Pd according to the low increase value and send it to RNC;

RNC is used to receive the Pd value from Node B, compare the Pd value with the cell unit value Pd0 of the propagation delay cell corresponding to the distance threshold value, and determine that the Pd value is less than or equal to the described When Pd0, determine the distance range interval between the current UE and the Node B reporting the Pd value according to the low increment value, and determine the distance between the current UE and the Node B reporting the Pd value according to the preset high increment value when it is determined that the Pd value is greater than the Pd0 The distance range interval between Node Bs of the Pd value, and interact with NodeBs and UEs for random access.

Wherein, the Node B includes: a distance measurement submodule, a comparator submodule, and a distance information processing submodule, wherein,

The distance measurement sub-module is used to measure the distance between the Node B and the UE during random access of the UE, and output the measured distance value to the comparator sub-module;

The comparator sub-module is used to receive the distance value output by the distance measurement sub-module, compare the distance value with a preset distance threshold value, and output the comparison result to the distance information processing sub-module;

The distance information processing submodule is used to receive the result output by the comparator submodule, and for the UE whose distance value is greater than the distance threshold value, calculate the propagation delay value Pd according to the preset high increase value, and send it to the RNC; As a result, the UE whose distance value is less than or equal to the distance threshold value calculates the propagation delay value Pd according to the preset low increase value and sends it to the RNC.

Wherein, the RNC includes: an analysis submodule and a distance range determination submodule, wherein,

Analytic sub-module, used to receive the Pd value from Node B, output to the distance range determination sub-module;

The distance range determination submodule is used to receive the Pd value sent by the analysis submodule, compare Pd with the cell unit value Pd0 of the propagation delay cell corresponding to the distance threshold value, and determine that the Pd value is less than or equal to the When Pd0, determine the distance range interval between the current UE and the Node B reporting the Pd value according to the preset low increase value; when it is determined that the Pd value is greater than the Pd0, determine the current range according to the set high increase value The operation of the distance range interval between the UE and the Node B reporting the Pd value.

It can be seen that, in the method and system provided by the present invention, by setting the distance threshold for the distance between the UE and the Node B, for UEs greater than the distance threshold, the chip increase rate is set to a high value, and then the Node B sets the propagation The delay value Pd is: the difference between the chip length corresponding to the distance and the chip length corresponding to the distance threshold value divided by the high increase value and rounded up, plus the propagation delay cell unit corresponding to the distance, after this processing, it can be increased Propagate the distance information carried by the delay cell, so that the access radius can be increased, and then the radio network controller (RNC, Radio Network Controller) will reverse the Pd value according to the high increase value; for UEs less than or equal to the distance threshold value , the chip increase rate is still 3, that is, according to the measurement value in the prior art, every increase of 1 cell unit still represents an increase of 3 chip length delays, so that it can be guaranteed that when the TOA positioning method is used for positioning, the Node The positioning accuracy of the UE within a short distance of B, and for the densely distributed Node B, can be compatible with the method in the present invention without any change.

Further, by setting the chip increase rate to a low increase value for UEs less than or equal to the distance threshold value, in addition to ensuring the positioning accuracy of UEs within a short distance from the Node B, it can also improve the docking rate in practical applications. Flexible control of the entry radius.

Description of drawings

Fig. 1 is a schematic diagram of the relationship among the distance threshold value, the high added value and the required access radius.

Fig. 2 is a flow chart of a UE random access method in the first embodiment of the present invention.

Fig. 3 is a flowchart of a random access method of a UE in the second embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a UE random access system in an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

The basic idea of the present invention is: set the distance threshold for the distance between the UE and the Node B, set the chip increase rate to a high value for the UE greater than the distance threshold value, the Node B measures the distance with the current UE, and determines When the obtained distance value is greater than the distance threshold value, calculate the propagation delay value Pd according to the set high increase value and send it to RNC; RNC receives the Pd value from Node B, and calculates the propagation delay value Pd according to the set high increase value Determine the distance range between the current UE and the Node B reporting the Pd value, and interact with the Node B and UE to perform random access. By setting a high increase value, the purpose of increasing the access radius can be achieved. At the same time, no change is made to UEs that are less than or equal to the distance threshold, and they are still processed according to the existing technology, so that the positioning accuracy of UEs that are closer to the Node B can be guaranteed.

Among them, when the UE that is less than or equal to the distance threshold value is processed according to the existing technology, it is equivalent to setting a low increase value of 3 for the chip increase rate, and the distance threshold value, the high increase value, and the required access radius The relationship between them is shown in Figure 1. In Figure 1, the abscissa is the cell unit value of the propagation delay cell, the ordinate is the access radius, and the abscissa corresponding to the inflection point of the broken line is the propagation delay signal corresponding to the distance threshold. The cell unit value of a cell, in order to describe briefly, the cell unit value of the propagation delay cell corresponding to the distance threshold value is recorded as Pd0, which is also used in other places in the text, and the lower half of the broken line is the chip increase rate is a schematic diagram of 3, and the upper half of the folded line is a schematic diagram of a high chip increase rate, and the desired access radius=Pd0×3×78 meters+((2 ⁸ -1)-Pd0)×high increase Value × 78 meters. Further, in the present invention, for UEs less than or equal to the distance threshold value, the chip increase rate can be set to a low increase value, and the distance threshold value, high increase value, low increase value, and the access radius to be achieved The relationship among them is: Pd0×low added value×78 meters+((2 ⁸ −1)−Pd0)×high added value×78 meters=the access radius to be achieved.

A UE random access method according to the present invention will be described below in conjunction with an embodiment.

Embodiment one:

Referring to FIG. 2 , FIG. 2 is a flowchart of a UE random access method in the first embodiment of the present invention. In this embodiment, a distance threshold is set in advance for the distance between the UE and the Node B, and for UEs whose distance is greater than the distance threshold, the chip increase rate is set to a high value. The purpose of setting a high value is to make the propagation Delayed cells can carry information at a greater distance, thereby increasing the access radius; for UEs whose distance is less than or equal to the distance threshold, set the chip increase rate to a low increase value. The purpose of setting a low increase value is to ensure In order to achieve compatibility with existing densely distributed Node Bs, the TOA positioning accuracy of short-distance UEs may not be set to a low added value, and the chip increase rate of 3 in the prior art is still used. Among them, the relationship between the distance threshold, high added value, low added value, and the access radius to be achieved is: Pd0×low added value×78 meters+((2 ⁸ -1)-Pd0)×high added value× 78 meters = the access radius to be achieved. The process includes the following steps:

Step 201, when the UE randomly accesses, the Node B measures the distance between the current UE and itself.

In this step, Node B first measures the delay of the uplink signal sent by the current UE, and obtains the delay value T, and then obtains the distance between the UE and itself according to the distance calculation formula D=c×T, where c is the transmission Speed, generally the speed of light; D is the distance between UE and Node B.

Step 202, Node B compares the obtained distance value with the set distance threshold value, if it is less than or equal to the set distance threshold value, then execute step 203; otherwise, execute step 204.

Wherein, the preset distance threshold value can be the actual number of kilometers of the distance, such as 23 kilometers; it can also be the chip length corresponding to the distance, such as 300 chip length; it can also be the cell of the propagation delay cell corresponding to the distance Unit value, such as 100 etc. Among them, the relationship between the cell unit value x of the propagation delay cell corresponding to the distance, the chip length y corresponding to the distance, and the kilometer S corresponding to the distance is: x×chip increase rate=y, and because the code of WCDMA The chip rate is 3.84M chips/second, so the delay corresponding to one chip length is 1/3.84M=0.26 microseconds, according to the link transmission speed is the speed of light 299792458 m/s, then the delay corresponding to one chip length The distance is 299792458×2.6×10 ⁻⁷ =78 meters, so y×78 meters=S.

If the preset distance threshold value is the chip length corresponding to the distance, the distance value obtained in this step between the current UE and the Node B also needs to be represented by the corresponding chip length.

In step 203, the Node B sets the propagation delay value Pd to be: the chip length corresponding to the distance obtained in step 202 is divided by the low increase value and rounded up, and then step 205 is executed.

In this step, if the distance obtained in step 202 is represented by actual kilometers, then in this step, the kilometers should be converted into chip length, that is, the distance value is divided by 78 meters to obtain the chip length, and then the calculation is performed. The purpose of dividing the chip length corresponding to the distance by the low added value and rounding it up is to convert the distance value into distance information that can be carried by the propagation delay cell. Among them, the Pd value is the unit value of the propagation delay cell, because the length of the propagation delay cell is 8 bits, a total of 2 ⁸ -1 = 255 units, so the propagation delay cell can only carry the number of units between 0 and 255 .

Step 204, Node B sets the propagation delay value Pd as follows: the chip length corresponding to the distance obtained in step 202 is subtracted from the chip length corresponding to the distance threshold value, divided by the high increase value and rounded, and then added to Pd0 , and then execute step 205.

In this step, if the distance obtained in step 202 is represented by actual kilometers, then in this step, the kilometers should be converted into chip length first, and then the calculation is performed. The calculation process in this step is also for converting the distance value into distance information that can be carried by the propagation delay cell.

In step 205, the Node B encapsulates the Pd value in a propagation delay cell and sends it to the RNC.

In this step, the Pd value is first encapsulated in a propagation delay cell, and the information frame carrying the cell is sent to the RNC.

Step 206, the RNC receives the propagation delay information element, and parses out the Pd value from it.

In step 207, the RNC compares the analyzed Pd value with Pd0, and judges whether it is less than or equal to the Pd0, and if it is less than or equal to, execute step 208; otherwise, execute step 209.

In step 208, the RNC performs an inverse solution to the Pd value, and determines that the distance range between the current UE and the Node B reporting the Pd value is: ((Pd-1) × low increase value × 78 meters, Pd × low increase value × 78 meters).

In this step, because the Pd value is an integer after rounding, only one range interval can be obtained when it is inversely solved.

Step 209, the RNC performs an inverse solution to the Pd value, and determines that the distance range interval between the current UE and the Node B reporting the Pd value is: (((Pd-1-Pd0)×high increase value+distance threshold value Corresponding chip length) × 78 meters, ((Pd-Pd0) × high increase value + chip length corresponding to the distance threshold value) × 78 meters).

In this step, since the Pd value is an integer after rounding, a range interval is obtained when it is inversely resolved. The calculation of the range interval is obtained according to the relationship between various parts in the relationship diagram shown in FIG. 1 .

So far, this process ends. Other access work can be handled according to the methods in the prior art, and will not be repeated in this method.

Wherein, in step 205, the information of the chip increase rate used in step 203 or step 204 can also be carried in the information frame and sent to RNC, then step 207 does not need to compare the Pd value with Pd0, but directly calculates the The chip increase rate on which the Pd value is based determines the distance range interval between the current UE and the Node B that reported the Pd value.

Embodiment two:

Referring to FIG. 3 , FIG. 3 is a flowchart of a UE random access method in the second embodiment of the present invention. In this embodiment, taking the case where the access radius is 200 kilometers as an example, a distance threshold is set in advance for the distance between UE and Node B, and the distance threshold is set to 300 chip lengths. Compatible with the Node B, in this embodiment, the chip increase rate is not set to a low increase value, but the measurement value in the prior art is used. Every increase of 1 unit represents an increase of 3 chip lengths, that is, the chip increase rate is 3 , then the cell unit of the propagation delay cell corresponding to the length of 300 chips, that is, Pd0 is: 300÷3=100, then according to the relational expression: Pd0×3×78 meters+((2 ⁸ -1)-Pd0) × high added value × 78 meters = the access radius to be achieved, there are 100 × 3 × 78 meters + (255-100) × high added value × 78 meters = 200 kilometers, the high added value can be calculated: 15, so For UEs whose distance is greater than the distance threshold, set the chip increase rate to 15. As shown in Figure 3, this process includes the following steps:

Step 301, when the UE randomly accesses, the Node B measures the distance between the UE and itself.

In this step, the Node B first measures the delay of the uplink signal sent by the UE, and obtains the delay value T, and then calculates the formula D=c×T according to the distance, where c is the transmission speed, and D is the distance between the UE and the Node B. If the distance D is represented by the chip length, the chip rate of WCDMA is 3.84M chips/second, and D=T×(3.84×10 ⁶ ) chip length can be obtained.

Step 302, Node B compares the obtained distance value D with the set distance threshold value of 300 chips, if it is less than or equal to 300 chips, then executes step 303; otherwise, executes step 304.

In step 303, the Node B sets the propagation delay value Pd to be: the chip length D corresponding to the distance obtained in step 302 is divided by 3 and rounded, that is, Pd=int(D/3), and then step 305 is performed.

Step 304, Node B sets the propagation delay value Pd as: the chip length D corresponding to the distance obtained in step 302 minus the chip length 300 corresponding to the distance threshold value, then divide by the high increase value 15 and round up, and then Add the Pd0 value of 100, that is, Pd=int(D-300)/15+100, and then execute step 305 .

In step 305, the Node B encapsulates the Pd value in a propagation delay cell and sends it to the RNC.

Step 306, the RNC receives the propagation delay information element, and parses out the Pd value from it.

In step 307, the RNC compares the analyzed Pd value with the Pd0 value of 100, and judges whether it is less than or equal to the Pd0 value of 100. If it is less than or equal to 100, execute step 308; otherwise, execute step 309.

In step 308, the RNC performs an inverse solution to the Pd value, and determines that the distance range interval between the current UE and the Node B reporting the Pd value is: ((Pd-1)×3×78 meters, Pd×3×78 meters ).

Step 309, the RNC performs an inverse solution to the Pd value, and determines that the distance range between the current UE and the Node B reporting the Pd value is: (((Pd-100-1)×15+300)×78 meters, ((Pd-100)×15+300)×78 meters).

So far, this process ends, and the subsequent access work can be processed according to the method in the prior art.

Among them, also taking the access radius increased to 200 kilometers as an example, the values of the distance threshold, high added value, and low added value can also be: the distance threshold is set to 300 chips, and the low added value is 2. The high added value is 14 and so on.

It can be found from the above-mentioned embodiments that by setting a low added value in this method, the TOA positioning accuracy for short-distance UEs can be guaranteed. In order to achieve compatibility with existing densely distributed Node Bs, the low added value may not be set, but still use In the prior art, the chip increase rate is 3. By setting a high added value, the access radius can be increased. Although the TOA positioning accuracy of the UE far from the Node B will be reduced, the long-distance UE can often achieve GPS positioning, and the positioning accuracy is only relatively reduced. In application, it can still meet the needs.

In practical applications, two distance thresholds can also be set for the distance between UE and Node B, the first distance threshold and the second distance threshold, and the second distance threshold is greater than the first distance threshold, and the pair distance is greater than the second distance threshold value, set the chip increase rate to a high increase value; for UEs whose distance is greater than the first distance threshold and less than or equal to the second distance threshold, set the chip increase rate to an intermediate increase value; for distances less than or equal to the second distance threshold For a UE with a distance threshold value, set the chip increase rate to a low value. If the cell unit value of the propagation delay cell corresponding to the first distance threshold value is Pd1, record the propagation delay cell corresponding to the second distance threshold value. The cell unit value of the delayed cell is Pd2, and the relationship between each part satisfies: Pd1×low added value×78m+(Pd2-Pd1)×middle added value×78m+((2 ⁸ -1) -Pd2)×high increase value×78 meters=access radius to be achieved.

During random access, Node B measures the distance between itself and the current UE, and when it is determined that the obtained distance value is less than or equal to the first distance threshold value, the propagation delay value Pd is calculated according to the set low increase value as: the code corresponding to the distance The slice length is divided by the low increase value and rounded up; when it is determined that the obtained distance value is greater than the first distance threshold value and less than or equal to the second distance threshold value, the propagation delay value Pd is calculated according to the set intermediate increase value as: The chip length corresponding to the distance is subtracted from the chip length corresponding to the first distance threshold value, divided by the intermediate increase value and rounded, and then added to Pd1; when the determined distance value is greater than the second distance threshold value , the propagation delay value Pd is calculated according to the set high increase value as follows: the chip length corresponding to the distance is subtracted from the chip length corresponding to the second distance threshold value, divided by the high increase value and rounded, and then added Pd2, and then Node B sends the calculated Pd value to RNC.

RNC receives the Pd value from Node B, compares the Pd value with Pd1 and Pd2 respectively, if the Pd value is less than or equal to Pd1, then determines the current UE and the Node B that reported the Pd value according to the set low increase value The distance range interval between them is: ((Pd-1) × low increase value × 78 meters, Pd × low increase value × 78 meters); if the Pd value is greater than Pd1 and less than or equal to Pd2, then follow the set intermediate increase value Determine the distance range interval between the current UE and the Node B reporting the Pd value as: (((Pd-1-Pd1)×intermediate increase value+chip length corresponding to the first distance threshold value)×78 meters, ((Pd-Pd1) × intermediate increase value + chip length corresponding to the first distance threshold value) × 78 meters); if the Pd value is greater than Pd2, then determine the current UE and report the Pd according to the set high increase value The distance range interval between Node Bs of the value is: (((Pd-1-Pd2)×high increase value+chip length corresponding to the second distance threshold value)×78 meters, ((Pd-Pd2)×high Increased value + chip length corresponding to the second distance threshold value) × 78 meters); and the RNC interacts with the Node B and the UE to perform random access.

Similarly, more than two distance thresholds can also be set for the distance between the UE and the Node B.

A system combination embodiment of UE random access in the present invention will be described below.

Referring to FIG. 4, FIG. 4 is a schematic structural diagram of a UE random access system in this embodiment, and the system includes: UE400, Node B410 and RNC420.

Wherein, UE400 is configured to send an uplink signal to NodeB410 when initially establishing random access.

Node B410 is used to receive the uplink signal of UE400 when initially establishing random access, and measure the time delay of the uplink signal, calculate the distance between UE400 and itself, and compare the distance value with the preset distance threshold value, if the distance is less than or equal to the set distance threshold value, it will be processed according to the preset low increase value, and the propagation delay value Pd is calculated as: the chip length corresponding to the measured distance divided by the set low increase If the distance is greater than the set distance threshold value, it will be processed according to the preset high increase value, and the propagation delay value Pd is calculated as: the chip length corresponding to the measured distance corresponds to the distance threshold value Subtract the chip length of , then divide by the set high increase value and round up, add Pd0, then encapsulate the calculated Pd value in the propagation delay cell, and send it to RNC420 through the information frame carrying the cell .

Among them, the set distance threshold value, low added value and high added value satisfy the relationship: Pd0×low added value×78 meters+((2 ⁸ -1)-Pd0)×high increased value×78 meters=required Access radius reached.

RNC420 is configured to receive the information frame from Node B410, and parse the propagation delay value Pd from the propagation delay cell therein, compare the propagation delay value Pd with Pd0, if the propagation delay value is less than or equal to Pd0, then The Pd value is inversely resolved according to the preset low added value, and the range interval of the location of the UE400 relative to the Node B410 that reported the Pd value ((Pd-1)×low added value×78 meters, Pd × low added value × 78 meters); if the propagation delay value is greater than Pd0, the corresponding inverse solution is performed on the Pd value according to the preset high added value, and the range interval where UE400 is located (((Pd-1-Pd0) × high increase value + chip length corresponding to the distance threshold value) × 78 meters, ((Pd-Pd0) × high increase value + chip length corresponding to the distance threshold value) × 78 meters). And interact with Node B and UE to perform random access.

Wherein, Node B410 includes: distance measurement submodule 411, comparator submodule 412 and distance information processing submodule 413, and these modules can be set in the uplink data processing module in Node B410.

The distance measurement sub-module 411 is configured to measure the uplink signal delay of the UE400 during random access to obtain the distance to the UE400, and output the distance to the comparator sub-module 412.

The comparator sub-module 412 is configured to receive the distance value output by the distance measurement sub-module 411 , compare the distance value with a preset distance threshold value, and output the comparison result to the distance information processing sub-module 413 .

The distance information processing sub-module 413 is used to receive the result output by the comparator sub-module 412, and for the UE whose distance value is greater than the distance threshold value, calculate the propagation delay value Pd according to the preset high increase value as: corresponding to the distance The chip length is subtracted from the chip length corresponding to the distance threshold value, and then divided by the high increase value and rounded up, and then added to Pd0; for UEs whose distance value is less than or equal to the above distance threshold value, according to the preset The propagation delay value Pd calculated by the low added value is: the chip length corresponding to the distance is divided by the low added value and rounded, and then the Pd value is encapsulated in a propagation delay cell, and sent to RNC420 through an information frame carrying the cell.

Wherein, the RNC 420 includes: an analysis submodule 421 and a distance range determination submodule 422, and these modules can be set in the uplink data processing module in the RNC.

The parsing sub-module 421 is used to receive the information frame from the Node B410, and parse the Pd value from the propagation delay cell therein, and output it to the distance range determination sub-module 422.

The distance range determination submodule 422 is used to receive the Pd value from the analysis submodule 421, compare Pd with Pd0, and determine the current UE400 and report according to the preset high increase value for the Pd value greater than the cell unit. The distance range interval between Node B410 of this Pd value is: ((Pd-1)×low increase value×78 meters, Pd×low increase value×78 meters); for the Pd value less than or equal to the above cell unit, according to The preset low increase value determines the distance range between the current UE400 and the Node B410 reporting the Pd value: (((Pd-1-Pd0)×high increase value+the chip length corresponding to the distance threshold value) × 78 meters, ((Pd-Pd0) × high increase value + chip length corresponding to the distance threshold value) × 78 meters).

In practical applications, Node B410 and RNC420 can also perform corresponding processing according to the two distance thresholds preset for the distance between UE and Node B. The processing method is the same as the introduction in the method embodiment, and will not be repeated here. Similarly, corresponding processing may also be performed on more than two preset distance thresholds.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a demonstration of the idea of the present invention, and is not used to limit the present invention scope of protection. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A method for random access of user equipment UE, characterized in that, a distance threshold value is set in advance for the distance between the UE and the base station Node B, and a high increase value is set for the chip increase rate, the method includes the following steps : A. Node B measures the distance with the current UE, and when the determined distance value is greater than the distance threshold value, calculates the propagation delay value Pd according to the set high increase value and sends it to the radio network controller RNC; When the obtained distance value is less than or equal to the distance threshold value, calculate the propagation delay value Pd according to the low increase value and send it to the RNC; B. RNC receives the Pd value from Node B, compares the Pd value with the cell unit value Pd0 of the propagation delay cell corresponding to the distance threshold value, and determines that the Pd value is less than or equal to the Pd0 , determine the distance range interval between the current UE and the Node B reporting the Pd value according to the low increase value, and determine the distance between the current UE and the reported Node B according to the set high increase value when the Pd value is determined to be greater than the Pd0. The distance range interval between Node Bs of the Pd value, and RNC interacts with Node Bs and UEs to perform random access. 2. The method according to claim 1, characterized in that, sending the propagation delay value Pd to the RNC as described in step A is: encapsulating the Pd value in a propagation delay cell, and sending it through an information frame carrying the cell to the RNC; Then in the step B, the RNC receives the Pd value from the Node B: the RNC receives the information frame from the Node B, and resolves the Pd value from the propagation delay cell therein. 3. The method according to claim 1, characterized in that the propagation delay value Pd calculated according to the set high added value in step A is: the chip length corresponding to the distance obtained by Node B measurement and the distance threshold The chip length corresponding to the value is subtracted, and then divided by the set high increase value and rounded up, and then the cell unit value Pd0 of the propagation delay cell corresponding to the distance threshold value is added; As described in step B, according to the set high increase value, determine the distance range interval between the current UE and the Node B reporting the Pd value: determine the lower limit value of the distance: ((Pd-1-Pd0) × high increase value+the chip length corresponding to the distance threshold value)×78 meters, and the upper limit value of the determined distance is: ((Pd-Pd0)×high increase value+the chip length corresponding to the distance threshold value)×78 meters. 4. The method according to claim 1, wherein the propagation delay value Pd calculated according to the set low added value in step A is: the chip length corresponding to the distance measured by Node B divided by the set Low added value and rounded; In step B, according to the set low increase value, determine the distance range interval between the current UE and the Node B reporting the Pd value: determine the lower limit of the distance: (Pd-1) × low increase value × 78 meters, determine the upper limit value of the distance: Pd × low increase value × 78 meters. 5. The method according to claim 1, wherein the preset distance threshold value is: the delay distance corresponding to the length of 300 chips, and the preset high increase value is: 15. 6. A method for random access of user equipment UE, characterized in that a first distance threshold and a second distance threshold are set in advance for the distance between the UE and the base station Node B, and the second distance threshold Greater than the first distance threshold value, and a high increase value and an intermediate increase value are set to the chip increase rate, the method includes the following steps: A. Node B measures the distance from the current UE, and when the determined distance value is greater than the second distance threshold value, calculates the propagation delay value Pd according to the set high increase value; when the determined distance value is greater than the set When the first distance threshold value is less than or equal to the second distance threshold value, the propagation delay value Pd is calculated according to the set intermediate increase value; when the determined distance value is less than or equal to the first distance threshold value , calculate the propagation delay value Pd according to the set low added value, and then the Node B sends the calculated Pd value to the RNC; B. RNC receives the Pd value from Node B, and the Pd value is respectively the cell unit value Pd1 of the propagation delay cell corresponding to the first distance threshold value, and the propagation delay cell corresponding to the second distance threshold value If the Pd value is greater than Pd2, then determine the distance range interval between the current UE and the Node B that reported the Pd value according to the set high increase value; if the Pd value is greater than Pd1 and less than or equal to Pd2, then determine the distance range between the current UE and the Node B reporting the Pd value according to the set intermediate increase value; The distance range interval between Node Bs of the Pd value; and RNC interacts with Node Bs and UEs to perform random access. 7. A system for UE random access, characterized in that the system includes: Node B and RNC, wherein, The Node B is used to measure the distance between itself and the UE when the UE randomly accesses, and when the obtained distance value is determined to be greater than the preset distance threshold value, calculate the propagation delay value Pd according to the preset high increase value and Send to RNC; When determining that the obtained distance value is less than or equal to the preset distance threshold value, calculate the propagation delay value Pd according to the low increase value and send it to RNC; RNC is used to receive the Pd value from Node B, compare the Pd value with the cell unit value Pd0 of the propagation delay cell corresponding to the distance threshold value, and determine that the Pd value is less than or equal to the described When Pd0, determine the distance range interval between the current UE and the Node B reporting the Pd value according to the low increment value, and determine the distance between the current UE and the Node B reporting the Pd value according to the preset high increment value when it is determined that the Pd value is greater than the Pd0 The distance range interval between Node Bs of the Pd value, and interact with NodeBs and UEs for random access. 8. The system according to claim 7, wherein the Node B comprises: a distance measurement submodule, a comparator submodule, and a distance information processing submodule, wherein, The distance measurement sub-module is used to measure the distance between the Node B and the UE during random access of the UE, and output the measured distance value to the comparator sub-module; The comparator sub-module is used to receive the distance value output by the distance measurement sub-module, compare the distance value with a preset distance threshold value, and output the comparison result to the distance information processing sub-module; The distance information processing submodule is used to receive the result output by the comparator submodule, and for the UE whose distance value is greater than the distance threshold value, calculate the propagation delay value Pd according to the preset high increase value, and send it to the RNC; As a result, the UE whose distance value is less than or equal to the distance threshold value calculates the propagation delay value Pd according to the preset low increase value and sends it to the RNC. 9. The system according to claim 7, wherein the RNC includes: an analysis submodule and a distance range determination submodule, wherein, Analytic sub-module, used to receive the Pd value from Node B, output to the distance range determination sub-module; The distance range determination submodule is used to receive the Pd value sent by the analysis submodule, compare Pd with the cell unit value Pd0 of the propagation delay cell corresponding to the distance threshold value, and determine that the Pd value is less than or equal to the When Pd0, determine the distance range interval between the current UE and the Node B reporting the Pd value according to the preset low increment value; determine the current UE according to the set high increment value when it is determined that the Pd value is greater than the Pd0 The distance range interval between the Node B and the Node B that reported the Pd value.

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