CN102098794A - Method and apparatus for processing random access collision - Google Patents
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Abstract
The embodiment of the invention discloses a method and apparatus for processing random access collision. By the technical scheme of the embodiment of the invention, whether enough isolation exists between corresponding antenna units can be judged when SYNC_UL (synchronous code uplink) code collision exists between the antenna units in a distributed antenna system; and the SYNC_UL code can be discarded when enough isolation does not exist between corresponding antenna units, so that the random access is continuously performed by adopting the SYNC_UL code having collision under the condition that the antenna units having SYNC_UL code collision have enough isolation, and the success ratio of random access in the distributed antenna system is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a device for processing a random access collision.
Background
Random Access is a basic process of a physical layer of a TD-SCDMA (Time Division Synchronous Code Division Multiple Access) system, and normal service interaction can be performed only when an uplink synchronization process is established by a terminal device. In the prior art, a flow diagram of a random access procedure is shown in fig. 1.
According to the content of the existing protocol standard, the whole TD-SCDMA system includes 256 different SYNC _ UL codes (Uplink synchronization codes), which are specifically divided into 32 groups, each of which has 8 Uplink synchronization codes. The code group and the cell code word have corresponding relation, and after the cell code word is determined, the SYNC-UL code group corresponding to the cell is confirmed.
In a specific implementation scenario, each cell corresponds to a set of SYNC _ UL codes, that is, all users in a cell share the set of SYNC _ UL codes for random access. The common use of the SYNC _ UL code group makes it possible for a plurality of users to select the same SYNC _ UL code at the same time, and especially in a cell with a large number of users, the probability of such collision is greatly increased.
In the smart antenna cell, the occurrence of SYNC _ UL code collision cannot be overcome. Since the smart antenna cell only covers a specific area, the reception and transmission of all users in the coverage area are equal, since SYNC _ UL \ FPACH (Fast Physical Access Channel) \\ PRACH (Physical Random Access Channel) is common, without distinguishing the users, the terminal device needs to determine whether it is scheduling itself according to the signature reference number (SYNC _ UL number) and the relative subframe number (the difference between the subframe number for transmitting SYNC _ UL and the subframe number for transmitting FPACH) carried by FPACH, therefore, if the FPACH is still scheduled in case of SYNC _ UL collision, then it will happen that the subsequent users receiving the FPACH are considered to be scheduling themselves because the signature reference number and the relative subframe number are the same, and simultaneously transmit PRACH, thereby causing interference with each other and resulting in access failure. Therefore, when the collision of the SYNC _ UL codes occurs in the smart antenna cell, only discarding can be selected, and the terminal device re-initiates access under the condition that access scheduling is not obtained.
Unlike smart antenna cells, a cell of a distributed antenna system generally covers more than one area, and the same distributed cell generally covers a plurality of different areas, and certain barriers may exist between the areas. Such as distributed single antenna cells, port cells and macro diversity cells commonly used for indoor coverage.
The problem of SYNC _ UL code collision still exists in distributed antenna cells, especially in some indoor locations with heavy personnel.
Currently, there are two main approaches to this situation; the first method is that as the intelligent antenna, a plurality of SYNC _ UL codes which conflict with each other are discarded, and the terminal equipment initiates access again; the second method is to simply select one of the colliding SYNC _ UL codes with the strongest received power for scheduling when there are colliding SYNC _ UL codes among the antenna units.
In implementing the embodiments of the present invention, the applicant finds that the prior art has at least the following problems:
first, the first method discards all or part of the conflicting SYNC _ UL codes, but because the probability of the occurrence of the SYNC _ UL code collision is high in the system access process, the access success rate is significantly reduced when a large number of users initiate access simultaneously.
On the other hand, for the second method, simply selecting the scheduling processing scheme with the strongest receiving power from the colliding SYNC _ UL codes may not sufficiently ensure that the colliding users may not receive the FPACH at the same time, so that the colliding users may send the PRACH at the same time, resulting in a high probability of PRACH reception failure.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for processing random access conflicts, which solve the problem of low random access success rate caused by SYNC _ UL code conflict in the conventional distributed antenna system.
In order to achieve the above object, an aspect of the embodiments of the present invention provides a method for processing a random access collision, including:
detecting SYNC _ UL code collision of all antenna units in the distributed antenna system;
when SYNC _ UL code collision is detected among a plurality of antenna units, SYNC _ UL codes corresponding to the plurality of antenna units with SYNC _ UL code collision are placed into a scheduling queue;
judging whether the isolation among a plurality of antenna units with SYNC _ UL code conflict reaches a preset condition or not;
and if the judgment result is negative, deleting SYNC _ UL codes corresponding to a plurality of antenna units of which the isolation does not reach the preset condition in the scheduling queue.
On the other hand, an embodiment of the present invention further provides a network device, which is applied to a distributed antenna system, and includes:
the detection module is used for detecting SYNC _ UL code collision of all antenna units in the distributed antenna system;
the processing module is used for placing SYNC _ UL codes corresponding to a plurality of antenna units with SYNC _ UL code conflicts into a scheduling queue when the detection module detects that SYNC _ UL code conflicts exist among the plurality of antenna units;
the judging module is used for judging whether the isolation between the antenna units with SYNC _ UL code conflicts reaches a preset condition or not when the detecting module detects that SYNC _ UL code conflicts exist among the antenna units;
and the deleting module is used for deleting SYNC _ UL codes corresponding to a plurality of antenna units, the isolation degrees of which do not reach the preset condition, which are put in the processing module, in the scheduling queue when the judgment result of the judging module is negative.
In another aspect, an embodiment of the present invention further provides a network device, including:
the storage module is used for initially establishing isolation information among all antenna units in the distributed antenna system and storing the isolation information;
the measuring module is used for measuring in real time and acquiring new isolation information among the antenna units;
and the updating module is used for performing regression averaging on the new isolation information acquired by the measuring module and the previously stored isolation information between the corresponding antenna units in the storage module, and updating the isolation information between the antenna units stored in the storage module according to the result obtained by the regression averaging.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, whether the corresponding antenna units have enough isolation or not can be further judged when SYNC _ UL code conflict exists between the antenna units in the distributed antenna system, and the SYNC _ UL code is discarded only when the corresponding judgment result is negative, so that the antenna units with SYNC _ UL code conflict can continue random access by using the conflicting SYNC _ UL codes under the condition of having enough isolation, and the success rate of random access in the distributed antenna system is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart illustrating a conventional random access procedure;
fig. 2 is a schematic flowchart of a method for processing a random access collision according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for processing a random access collision in a specific application scenario according to an embodiment of the present invention;
fig. 4 is a schematic diagram of collision detection in an antenna unit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a network device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present invention.
Detailed Description
As described in the background art, in a distributed antenna system (including distributed smart antennas, distributed single antennas, Portion cells, and other distributed antenna systems), if the current processing strategy of SYNC _ UL code collision is adopted, no matter the colliding SYNC _ UL codes are discarded uniformly, or the SYNC _ UL code with the strongest received power is simply selected for scheduling, the random access success rate is low, or the reception failure rate of the subsequent PRACH is high.
Therefore, the embodiment of the invention provides a processing method of random access, under the condition that SYNC _ UL code conflict exists between antenna units in a distributed antenna system, the SYNC _ UL code which conflicts can be discarded only under the condition that the isolation degree between the antenna units which conflict cannot meet the requirement, and under the condition that the isolation degree can meet the requirement, the scheduling is continued according to the corresponding SYNC _ UL code, so that the discarding of the SYNC _ UL code is reduced, the FPACH recovery rate is improved, the receiving success rate of the PRACH can be ensured, and the success probability of the random access is improved.
As shown in fig. 2, a schematic flow chart of a method for processing a random access collision according to an embodiment of the present invention specifically includes the following steps:
step S201, detecting SYNC _ UL code collision for all antenna units in the distributed antenna system.
In a specific application scenario, the specific detection rule in this step is as follows.
(1) And detecting whether the antenna units corresponding to the same SYNC _ UL code exist in the distributed antenna system.
(2) If yes, determining that SYNC _ UL code collision exists between antenna units corresponding to the same SYNC _ UL code; and if not, determining that SYNC _ UL code collision does not exist among the antenna units in the distributed antenna system.
Further, when detecting that there is SYNC _ UL code collision between multiple antenna units according to the above rule, step S202 is executed.
Step S202, the SYNC _ UL codes corresponding to the multiple antenna units with SYNC _ UL code collision are placed in a scheduling queue.
Step S203, determine whether the isolation between the antenna units with SYNC _ UL code collision meets a preset condition.
If the judgment result is negative, executing step S204;
if the judgment result is yes, step S205 is executed.
In an actual application scenario, the preset conditions may include two situations that no SYNC _ UL code interference exists in the antenna units and the isolation between the antenna units is high enough.
The most critical determination condition in this step is actually "the isolation between the antenna units is high enough", and when SYNC _ UL code collision exists between the antenna units and SYNC _ UL code collision does not exist in the antenna units, it can be preliminarily determined that the isolation between the antenna units having collision is large enough, otherwise, under the condition of insufficient isolation, signals of the antenna units having collision will be received, thereby causing collision in the antenna.
Meanwhile, since the final judgment of the two conditions aims to confirm that the antenna units with the SYNC _ UL code interference have sufficient isolation, the two conditions can be combined for use in order to improve the accuracy of the judgment result, so as to obtain a more accurate result.
In practical applications, which of the two conditions is specifically adopted, or the combination of the two conditions is used as a judgment basis, which can be determined according to actual needs, and such changes do not affect the protection scope of the present invention.
The following specifically describes the flow of determining the above two conditions.
Condition one, no SYNC _ UL code interference exists in the antenna unit.
That is, the method is implemented by respectively determining whether there is SYNC _ UL code collision in an antenna unit in a plurality of antenna units in which there is SYNC _ UL code collision, and a specific determination process is described as follows.
In a plurality of antenna units with SYNC _ UL code collision, a power peak value in a peak value window of each antenna unit and a power peak value outside the peak value window are respectively detected.
And judging whether the difference between the power peak value in the peak value window of each antenna unit and the power peak value outside the peak value window is larger than a preset interference threshold value or not according to the corresponding detection result.
And if the judgment result is greater than or equal to the preset value, determining that the antenna unit does not have SYNC _ UL code conflict in the antenna unit, and if the judgment result is smaller than the preset value, determining that the antenna unit has SYNC _ UL code conflict in the antenna unit.
And in the second condition, the isolation between the antenna units is high enough.
Namely, whether the isolation between a plurality of antenna units with SYNC _ UL code conflict is larger than a preset isolation threshold value is judged according to the detected isolation statistical information between the antenna units in the distributed antenna system.
In an actual application scenario, the preset isolation threshold may be a value greater than or equal to 40 db.
It should be further explained that the following two ways are included to obtain the isolation statistical information between the antenna units in the distributed antenna system.
The first method is to obtain isolation information configured for each antenna unit in the distributed antenna system.
The precondition of this acquisition mode is that the system configures the isolation between the antenna units in advance, so that the isolation information can be directly acquired according to the corresponding configuration result.
And a second mode is obtained, the isolation information measured in real time for each antenna unit in the distributed antenna system is stored, and statistical processing is carried out.
First, isolation information between antenna elements in a distributed antenna system is initially established. In a specific implementation scenario, the above-mentioned isolation information may be recorded in a corresponding table form.
And when the new isolation information between the antenna units is obtained through real-time measurement, performing regression averaging on the new isolation information and the previously stored isolation information between the corresponding antenna units, and updating the isolation information between the antenna units according to the result obtained through the regression averaging.
In the above processing procedure, the specific processing strategy of regression averaging is performed according to the following formula:
wherein,
is a regression average factor;
Further, in the above-mentioned case,
the method is specifically determined by the following steps:
wherein,
receiving the power of the signal code for each antenna element;
In an actual application scenario, which of the above-mentioned acquisition manners can be specifically applied can be adjusted according to actual needs, and such a change does not affect the protection scope of the present invention.
Step S204, deleting SYNC _ UL codes corresponding to a plurality of antenna units whose isolation does not reach a preset condition in the scheduling queue.
Step S205, perform scheduling according to the SYNC _ UL code in the scheduling queue, and reply FPACH to the corresponding antenna after scheduling.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, whether the corresponding antenna units have enough isolation or not can be further judged when SYNC _ UL code conflict exists between the antenna units in the distributed antenna system, and the SYNC _ UL code is discarded only when the corresponding judgment result is negative, so that the antenna units with SYNC _ UL code conflict can continue random access by using the conflicting SYNC _ UL codes under the condition of having enough isolation, and the success rate of random access in the distributed antenna system is improved.
The technical solution proposed in the embodiment of the present invention is described below with reference to specific application scenarios.
In the above description, it has been mentioned that in a suitable scenario of a distributed antenna, there is a certain separation between coverage areas of the antenna units, i.e. the isolation between the antenna units. If the isolation between the respective antenna elements is high enough, even if there is SYNC _ UL code collision between the antenna elements, the interference between each other is maintained within an acceptable range due to the high isolation between the antenna elements.
Therefore, the key point of the technical solution proposed by the embodiment of the present invention is to determine whether there is sufficient isolation between the antenna units with SYNC _ UL code collision.
As shown in fig. 3, a schematic flow chart of a method for processing a random access collision in a specific application scenario provided in the embodiment of the present invention specifically includes the following steps:
step S301, SYNC _ UL detection is carried out on all antenna units.
When detecting that the same SYNC _ UL code exists among the antenna units, step S302 is continued.
Step S302, collision detection in antenna units is carried out on the antenna units with SYNC _ UL code collision.
The specific detection method is described as follows:
suppose Pmain Is the peak power of the peak window, PsideIs the maximum correlation power of the same SYNC _ UL code outside the peak window.
As shown in figure 4 of the drawings,
for the size of the peak window, the specific value may be configured according to the actual scene need, and the application scene of the distributed antenna system is considered, and the size of the peak window is generally smaller than that of the peak window in the smart antenna system.
The signals within the peak window are considered valid signals for the same user and the signals outside are considered invalid signals. However, if there is still a large signal outside the peak window, it is considered as the signal of other users, there may be collisions in the antenna unit, and the corresponding collision determination conditions are as follows:
wherein,
the specific size of the interference threshold can be configured according to actual needs.
If the above condition is satisfied, it can be considered that there is no SYNC _ UL code collision in the antenna unit, and if the above condition is not satisfied, that is:
，
the SYNC _ UL code is discarded assuming that there is a possibility of intra-antenna-unit collision for the antenna unit.
When SYNC _ UL code collision exists among the antenna units and no SYNC _ UL code collision exists in the antenna units, it may be preliminarily determined that the isolation between the antenna units having SYNC _ UL code collision is large enough, otherwise, under the condition of insufficient isolation, the antenna units having SYNC _ UL code collision among the antenna units may also receive signals from each other, thereby causing SYNC _ UL code collision in the antenna units.
Therefore, if the isolation between the antenna units is determined to be large enough according to the above principle, the SYNC _ UL codes causing the collision between the antenna units are all put into the scheduling queue to wait for the FPACH reply.
In an actual application scenario, the above processing scheme for determining the isolation according to whether SYNC _ UL code collision exists in the antenna units may not guarantee accurate determination of the isolation between the antenna units with SYNC _ UL code collision, and it may still happen that multiple users can receive FPACH, thereby causing a possibility of PRACH collision random access failure.
Therefore, the embodiment of the invention also provides another processing scheme for judging the isolation degree according to the isolation degree statistical information.
Since the SYNC _ UL code is shared, users cannot be distinguished, and it is impossible to determine whether the SYNC _ UL code received by multiple antenna units is transmitted by the same user or multiple users, the value of the isolation between the antenna units cannot be determined by the SYNC _ UL code.
The isolation between the antenna elements can be configured and can be counted based on the response communication or measurement information of any user at any time.
In a distributed antenna system, the isolation between each antenna unit has a certain relationship with the location of the user in the coverage area and the current environmental factors.
The embodiment of the invention provides the method for counting the isolation based on the DPCH channel of any user at any time in the distributed antenna system, so that the statistical value of the isolation between the antenna units of the user in the coverage area performing the service at the common position can be obtained. The isolation value is not an accurate value at a certain time, but a statistical value obtained by long-time statistics, which is not dependent on a certain user, but reflects the isolation between the antenna units in the area under normal conditions.
At present, cells in a distributed antenna system can perform space division multiplexing of HSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access) services, and therefore, it is necessary to measure user signals in real time and calculate isolation between antenna units according to measurement results, so as to determine whether space division multiplexing is possible.
Based on the processing procedure, the technical scheme of the embodiment of the invention can completely utilize the measurement and calculation results, and obtain corresponding isolation statistical information by storing and counting the isolation values obtained by real-time measurement.
The following describes in detail the process of acquiring the isolation statistical information in the technical solution proposed in the embodiment of the present invention as follows:
first, the RSCP (Received Signal Code Power) of the DPCH of any user at any time in the cell between each antenna unit is used to calculate the Signal isolation between the antenna units, and maintain the isolation statistical information table shown in table 1 below.
TABLE 1 table of statistical information on isolation between antenna elements
In table 1, AntN is the antenna element number,
the initial value is set according to the network optimization measured value or the empirical value for the isolation between the antenna units, and the change of the setting rule of the specific initial value does not influence the protection scope of the invention.
in the formula
To regress the average factor, in a practical application scenario,
can be specifically
Of course, other specific values may be set as needed.
c, RSCP calculation of each antenna unit of the user is carried out, and the specific calculation rule is as follows:
wherein,
the power of the received signal code for each antenna of the user,if the value is greater than the threshold, the isolation between the antenna units is taken into statistics, otherwise, the isolation between the antenna units is considered as
，
Can take values and suggest according to the implementation needs
。
The processing can increase the proportion of the isolation obtained when the signals are in the area with poor isolation in the final statistical value, and if the signals frequently appear in the overlapping area of the antenna units, the isolation statistical value can be rapidly reduced.
Degree of isolation between antennasIn time, the antenna units M and N are combined into the same antenna unit for baseband processing.Threshold values are combined for the antenna elements.
In the above processing procedure, the isolation statistical information table shown in table 1 may not only be used to determine whether there is a collision SYNC _ UL code to schedule a reply FPACH, but also provide a corresponding reference value for the space division service.
Then, the process of determining the isolation degree with reference to the above statistical information of the isolation degree between the antenna units is as follows:
firstly, the system performs SYNC _ UL detection on all antenna units, and when an antenna unit with SYNC _ UL code collision among the antenna units is detected, the system queries the isolation among the corresponding antenna units according to the information shown in table 1.
If the isolation is greater than the threshold
(suppose that
) If so, the separation between the antenna units where the colliding SYNC _ UL codes are located is considered to be large enough, so that PRACH collision is not caused, and therefore, the corresponding SYNC _ UL codes may continue to wait for scheduling in the scheduling queue and reply to FPACH on the corresponding antenna.
Otherwise, if the isolation is not greater than the threshold
But greater than the threshold
If the scheduling is performed subsequently, PRACH collision will be caused and random access will fail, so that the colliding SYNC _ UL codes are deleted from the scheduling queue to avoid wasting scheduling opportunities of other schedulable SYNC _ UL codes.
Otherwise, if the threshold of the isolation degree is smaller than the threshold value
Then the conflicting antenna element isolation is considered to be sufficiently small and combined into one antenna element for processing.
In practical application, the isolation degree is determined by specifically adopting which of the above-mentioned manners, and the specific value of the corresponding threshold value therein may be adjusted according to actual needs, such a change does not affect the protection scope of the present invention.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, whether the corresponding antenna units have enough isolation or not can be further judged when SYNC _ UL code conflict exists between the antenna units in the distributed antenna system, and the SYNC _ UL code is discarded only when the corresponding judgment result is negative, so that the antenna units with SYNC _ UL code conflict can continue random access by using the conflicting SYNC _ UL codes under the condition of having enough isolation, and the success rate of random access in the distributed antenna system is improved.
In order to implement the technical solution of the embodiment of the present invention, an embodiment of the present invention further provides a network device, which is applied to a distributed antenna system, and a schematic structural diagram of the network device is shown in fig. 5, and specifically includes:
a detection module 51, configured to perform SYNC _ UL code collision detection on all antenna units in the distributed antenna system;
a processing module 52, configured to, when the detecting module 51 detects that SYNC _ UL code collision exists among multiple antenna units, place SYNC _ UL codes corresponding to the multiple antenna units with SYNC _ UL code collision into a scheduling queue;
a determining module 53, configured to determine, when the detecting module 51 detects that SYNC _ UL code collision exists among multiple antenna units, whether isolation among the multiple antenna units with SYNC _ UL code collision reaches a preset condition;
a deleting module 54, configured to delete, in the scheduling queue, SYNC _ UL codes corresponding to multiple antenna units whose isolation degrees do not reach the preset condition, which are placed in the processing module 52, when the determination result of the determining module 53 is negative.
The detection module 51 is specifically configured to:
detecting whether antenna units corresponding to the same SYNC _ UL code exist in a distributed antenna system;
and if the SYNC _ UL code conflict exists, determining that the SYNC _ UL code conflict exists between the antenna units corresponding to the same SYNC _ UL code, and if the SYNC _ UL code conflict does not exist, determining that the SYNC _ UL code conflict does not exist between the antenna units in the distributed antenna system.
In an actual application scenario, the determining module 53 is specifically configured to:
respectively judging whether SYNC _ UL code conflicts exist in the antenna units in the plurality of antenna units with SYNC _ UL code conflicts; and/or the presence of a gas in the gas,
and judging whether the isolation between a plurality of antenna units with SYNC _ UL code conflict is larger than a preset isolation threshold or not according to the detected isolation statistical information between the antenna units in the distributed antenna system.
Further, the determining module 53 is specifically configured to:
respectively detecting a power peak value in a peak value window of each antenna unit and a power peak value outside the peak value window in a plurality of antenna units with SYNC _ UL code collision;
judging whether the difference between the power peak value in the peak value window of each antenna unit and the power peak value outside the peak value window is larger than a preset interference threshold value or not;
and if the judgment result is greater than or equal to the preset value, determining that the antenna unit does not have SYNC _ UL code conflict in the antenna unit, and if the judgment result is smaller than the preset value, determining that the antenna unit has SYNC _ UL code conflict in the antenna unit.
In an actual application scenario, the network device further includes a statistics module 55, configured to detect obtained isolation statistics information between antenna units in the distributed antenna system, where a manner of obtaining the isolation statistics information specifically includes:
obtaining isolation information configured for each antenna unit in a distributed antenna system; or,
and storing the isolation information measured in real time for each antenna unit in the distributed antenna system, and performing statistical processing.
Further, in order to achieve the acquisition of the isolation information, an embodiment of the present invention further provides a network device, a schematic structural diagram of which is shown in fig. 6, and the network device includes:
the storage module 61 is configured to initially establish isolation information between antenna units in the distributed antenna system, and store the isolation information;
the measurement module 62 is configured to measure in real time and obtain new isolation information between the antenna units;
and an updating module 63, configured to perform regression averaging on the new isolation information acquired by the measuring module 62 and the previously stored isolation information between the corresponding antenna units in the storage module 61, and update the isolation information between the antenna units stored in the storage module 61 according to a result obtained by the regression averaging.
In an actual application scenario, the updating module 63 is specifically configured to perform regression averaging in the following manner:
wherein,
in order to obtain the regression average factor,for previously stored isolation information between corresponding antenna elements,
obtaining new isolation information between the antenna units for real-time measurement;
further, in the above-mentioned case,
specifically, it is determined by the following means:
wherein,
the power of the received signal code for each antenna element,
in order to count the threshold value, the threshold value is calculated,
is a preset default isolation value.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, whether the corresponding antenna units have enough isolation or not can be further judged when SYNC _ UL code conflict exists between the antenna units in the distributed antenna system, and the SYNC _ UL code is discarded only when the corresponding judgment result is negative, so that the antenna units with SYNC _ UL code conflict can continue random access by using the conflicting SYNC _ UL codes under the condition of having enough isolation, and the success rate of random access in the distributed antenna system is improved.
Through the above description of the embodiments, it is clear to those skilled in the art that the embodiments of the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the embodiment of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various implementation scenarios of the embodiment of the present invention.
Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to implement embodiments of the present invention.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The sequence numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the implementation scenarios.
The above disclosure is only a few specific implementation scenarios of the embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be considered by those skilled in the art should fall within the scope of the business limitations of the embodiments of the present invention.
Claims (14)
1. A method for processing random access collision is characterized by comprising the following steps:
detecting SYNC _ UL code collision of all antenna units in the distributed antenna system;
when SYNC _ UL code collision is detected among a plurality of antenna units, SYNC _ UL codes corresponding to the plurality of antenna units with SYNC _ UL code collision are placed into a scheduling queue;
judging whether the isolation among a plurality of antenna units with SYNC _ UL code conflict reaches a preset condition or not;
and if the judgment result is negative, deleting SYNC _ UL codes corresponding to a plurality of antenna units of which the isolation does not reach the preset condition in the scheduling queue.
2. The method of claim 1, wherein the detecting SYNC _ UL code collisions for all antenna units in the distributed antenna system is performed by:
detecting whether antenna units corresponding to the same SYNC _ UL code exist in the distributed antenna system;
if yes, determining that SYNC _ UL code collision exists between antenna units corresponding to the same SYNC _ UL code;
and if not, determining that SYNC _ UL code collision does not exist among the antenna units in the distributed antenna system.
3. The method of claim 1, wherein the determining whether the isolation between the antenna units with SYNC _ UL code collision meets a predetermined condition comprises:
respectively judging whether SYNC _ UL code conflicts exist in the antenna units in the plurality of antenna units with SYNC _ UL code conflicts; and/or the presence of a gas in the gas,
and judging whether the isolation between a plurality of antenna units with SYNC _ UL code conflict is larger than a preset isolation threshold or not according to the detected isolation statistical information between the antenna units in the distributed antenna system.
4. The method according to claim 3, wherein the detected statistical information of the isolation between the antenna units in the distributed antenna system is obtained by:
obtaining isolation information configured for each antenna unit in the distributed antenna system; or,
and storing the isolation information measured in real time for each antenna unit in the distributed antenna system, and performing statistical processing.
5. The method according to claim 4, wherein the storing the isolation information measured in real time for each antenna unit in the distributed antenna system and performing statistical processing specifically includes:
initially establishing isolation information among antenna units in the distributed antenna system;
when the new isolation information between the antenna units is obtained through real-time measurement, regression averaging is conducted on the new isolation information and the previously stored isolation information between the corresponding antenna units, and the isolation information between the antenna units is updated according to the result obtained through the regression averaging.
6. The method of claim 5, wherein the new isolation information is regressively averaged with previously stored isolation information between corresponding antenna elements determined by:
wherein,
in order to obtain the regression average factor,
for previously stored isolation information between corresponding antenna elements,
new isolation information between antenna elements is obtained for real-time measurements.
7. The method of claim 6, wherein the method is as set forth in claim 6
Specifically, it is determined by the following means:
wherein,
the power of the received signal code for each antenna element,
in order to count the threshold value, the threshold value is calculated,
is a preset default isolation value.
8. The method according to any one of claims 1 to 7, wherein if the isolation between the antenna units with SYNC _ UL code collision is determined to reach a preset condition, the method further comprises:
and scheduling according to the SYNC _ UL codes in the scheduling queue, and replying FPACH on the corresponding antenna after scheduling.
9. A network device, for use in a distributed antenna system, comprising:
the detection module is used for detecting SYNC _ UL code collision of all antenna units in the distributed antenna system;
the processing module is used for placing SYNC _ UL codes corresponding to a plurality of antenna units with SYNC _ UL code conflicts into a scheduling queue when the detection module detects that SYNC _ UL code conflicts exist among the plurality of antenna units;
the judging module is used for judging whether the isolation between the antenna units with SYNC _ UL code conflicts reaches a preset condition or not when the detecting module detects that SYNC _ UL code conflicts exist among the antenna units;
and the deleting module is used for deleting SYNC _ UL codes corresponding to a plurality of antenna units, the isolation degrees of which do not reach the preset condition, which are put in the processing module, in the scheduling queue when the judgment result of the judging module is negative.
10. The network device of claim 9, wherein the detection module is specifically configured to:
detecting whether antenna units corresponding to the same SYNC _ UL code exist in the distributed antenna system;
and if the SYNC _ UL code conflict exists, determining that SYNC _ UL code conflict exists between the antenna units corresponding to the same SYNC _ UL code, and if the SYNC _ UL code conflict does not exist, determining that SYNC _ UL code conflict does not exist between the antenna units in the distributed antenna system.
11. The network device of claim 9, wherein the determining module is specifically configured to:
respectively judging whether SYNC _ UL code conflicts exist in the antenna units in the plurality of antenna units with SYNC _ UL code conflicts; and/or the presence of a gas in the gas,
and judging whether the isolation between a plurality of antenna units with SYNC _ UL code conflict is larger than a preset isolation threshold or not according to the detected isolation statistical information between the antenna units in the distributed antenna system.
12. The network device according to claim 9, further comprising a statistics module, configured to detect obtained isolation statistics information between antenna units in the distributed antenna system, where a manner of obtaining the isolation statistics information specifically includes:
obtaining isolation information configured for each antenna unit in the distributed antenna system; or,
and storing the isolation information measured in real time for each antenna unit in the distributed antenna system, and performing statistical processing.
13. A network device, comprising:
the storage module is used for initially establishing isolation information among all antenna units in the distributed antenna system and storing the isolation information;
the measuring module is used for measuring in real time and acquiring new isolation information among the antenna units;
and the updating module is used for performing regression averaging on the new isolation information acquired by the measuring module and the previously stored isolation information between the corresponding antenna units in the storage module, and updating the isolation information between the antenna units stored in the storage module according to the result obtained by the regression averaging.
14. The network device of claim 13, wherein the update module is specifically configured to perform the regression averaging by:
wherein,
in order to obtain the regression average factor,
for previously stored isolation information between corresponding antenna elements,
obtaining new isolation information between the antenna units for real-time measurement;
further, the
Specifically, it is determined by the following means:
wherein,the power of the received signal code for each antenna element,
in order to count the threshold value, the threshold value is calculated,
is a preset default isolation value.
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