CN112770403B - Random access method and device in professional digital cluster - Google Patents

Random access method and device in professional digital cluster Download PDF

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CN112770403B
CN112770403B CN201911059045.5A CN201911059045A CN112770403B CN 112770403 B CN112770403 B CN 112770403B CN 201911059045 A CN201911059045 A CN 201911059045A CN 112770403 B CN112770403 B CN 112770403B
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random access
reference value
control channel
uplink control
time window
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CN112770403A (en
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张禹强
李佳南
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TD Tech Ltd
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TD Tech Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides a random access method and a random access device in a Professional Digital Trunking (PDT). The method comprises the following steps: determining the random access instruction number of an uplink control channel in a preset time window and the high interference frame number of the uplink control channel in the preset time window; determining an adjustment reference value based on the random access instruction number of the uplink control channel and the high interference frame number of the uplink control channel; configuring access configuration parameters included in an ALOHA broadcast based on the adjustment reference value. In the embodiment of the invention, the base station detects the system access load, dynamically adjusts the random access strategy and the random access opportunity according to the load, discretizes the random access of the terminal and improves the access efficiency.

Description

Random access method and device in professional digital cluster
Technical Field
The invention belongs to the technical field of Professional Digital Trunking (PDT), and particularly relates to a random access method and a random access device in a Professional Digital Trunking.
Background
The PDT standard is a narrow-band trunking communication standard with Chinese proprietary intellectual property rights, and can meet the requirements of users in most trunking communication industries by focusing on the development direction of the future digital talkback technology. The PDT standard fully considers the situation of China, references and innovatively designs the international mature standard technology, follows five principles of high cost performance, safety, confidentiality, large area system, expandability and backward compatibility, and can solve the problem of converged communication of various emergency communication networks.
PDT is a narrow-band channel system. A macro base station has only one main control channel and a plurality of traffic channels at the same time. All terminal registration, roaming and service initiation need to be accessed on the main control channel. However, the main control channel can be accessed once every 60 ms, and if some services need to be accessed for multiple times or a large number of terminals are accessed together, the control channel is blocked, which seriously affects the access efficiency. After congestion occurs in terminal access, the request cannot be received by the base station, and the base station does not reply within a certain time, and the terminal retransmits according to relevant access configuration parameters in the ALOHA broadcast of the base station. The main signaling in ALOHA broadcasting includes: (1) After sending out the access C _ RAND message, the terminal waits for the corresponding maximum time (WT) of the base station; (2) After the WT time arrives, the terminal retransmits the random back-off maximum time (Backoff) of the C _ RAND; (3) Random access invite user scope control message (SF), and so on.
In general, the system random access load is not large, and the random access related parameter configuration in ALOHA broadcast should improve the access speed of the terminal and improve the service awareness. However, in some scenarios, a situation that a large number of terminals access to a network at the same time in a centralized manner exists, and at this time, the large number of terminals collide at an air interface, and if the base station cannot dynamically adjust access parameters and an access mechanism according to access pressure, the large number of terminals will continuously collide and transmit, the base station cannot demodulate, the random access efficiency is affected, and finally the access perception is affected.
Disclosure of Invention
The embodiment of the invention provides a random access method and a random access device in a professional digital cluster.
The technical scheme of the embodiment of the invention is as follows:
a random access method in professional digital cluster is suitable for a base station, and comprises the following steps:
determining the random access instruction number of an uplink control channel in a preset time window and the high interference frame number of the uplink control channel in the preset time window;
determining an adjustment reference value based on the random access instruction number of the uplink control channel and the high interference frame number of the uplink control channel;
configuring access configuration parameters included in an ALOHA broadcast based on the adjustment reference value.
In one embodiment, the determining the number of uplink control channel random access commands in a predetermined time window and the number of uplink control channel high interference frames in the predetermined time window includes: determining N sampling points in the preset time window, wherein N is a positive integer at least 1; determining the random access instruction number of the uplink control channel of each sampling point and the high interference frame number of the uplink control channel of each sampling point;
the determining an adjustment reference value based on the uplink control channel random access instruction number and the uplink control channel high interference frame number comprises: for each sampling point, summing the random access instruction number of the uplink control channel of the sampling point and the high interference frame number of the uplink control channel of the sampling point, and dividing the summation result by the total number of the frames of the uplink control channel to determine the reference value of the sampling point; and determining the linear average value of the reference values of the N sampling points as the adjusting reference value.
In one embodiment, the number of uplink control channel random access commands within the predetermined time window includes: the number of registration instructions and the number of service instructions within a predetermined time window.
In one embodiment, the configuring the access configuration parameters included in the ALOHA broadcast based on the adjustment reference value includes at least one of:
if the adjustment reference value is larger than the adjustment reference value of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is increased;
if the adjustment reference value is larger than that of the last preset time window, the longest random back-off time for retransmitting the access message after the terminal waits for the maximum time of the base station response after sending the access message is increased;
if the adjustment reference value is larger than that of the last preset time window, reducing the range of random access inviting users;
if the adjustment reference value is smaller than the adjustment reference value of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is reduced;
if the adjustment reference value is smaller than that of the last preset time window, the longest random backoff time for retransmitting the access message after the terminal waits for the maximum time of the base station response after sending the access message is reduced;
and if the adjustment reference value is smaller than the adjustment reference value of the last preset time window, increasing the range of the random access inviting user.
A random access device in professional digital cluster, which is applied to a base station, comprises:
the first determining module is used for determining the random access instruction number of the uplink control channel in a preset time window and the high interference frame number of the uplink control channel in the preset time window;
a second determining module, configured to determine an adjustment reference value based on the random access instruction number of the uplink control channel and the high interference frame number of the uplink control channel;
an adjustment module for configuring access configuration parameters included in an ALOHA broadcast based on the adjustment reference value.
In one embodiment, the first determining module is configured to determine N sampling points within the predetermined time window, where N is a positive integer of at least 1; determining the random access instruction number of the uplink control channel of each sampling point and the high interference frame number of the uplink control channel of each sampling point;
the second determining module is used for summing the random access instruction number of the uplink control channel of each sampling point and the high interference frame number of the uplink control channel of the sampling point, and dividing the summation result by the total number of the frames of the uplink control channel to determine the reference value of the sampling point; and determining the linear average value of the reference values of the N sampling points as the adjusting reference value.
In one embodiment, the number of uplink control channel random access commands within the predetermined time window includes: the number of registration instructions and the number of service instructions within a predetermined time window.
In one embodiment, the adjustment module is configured to perform at least one of:
if the adjustment reference value is larger than that of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is increased;
if the adjustment reference value is larger than the adjustment reference value of the last preset time window, the longest random back-off time of the terminal for retransmitting the access message after waiting for the maximum time of the response of the base station after sending the access message is increased;
if the adjustment reference value is larger than that of the last preset time window, reducing the range of random access inviting users;
if the adjustment reference value is smaller than that of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is reduced;
if the adjustment reference value is smaller than that of the last preset time window, the longest random backoff time for retransmitting the access message after the terminal waits for the maximum time of the base station response after sending the access message is reduced;
and if the adjustment reference value is smaller than that of the last preset time window, increasing the range of the random access inviting users.
A random access device in a professional digital cluster comprises a processor and a memory;
the memory has stored therein an application executable by the processor for causing the processor to perform the random access method in a professional digital cluster as described in any one of the above.
A computer readable storage medium having stored therein computer readable instructions for performing the random access method in a professional digital cluster as described in any one of the above.
According to the technical scheme, in the embodiment of the invention, the random access instruction number of the uplink control channel in the preset time window and the high interference frame number of the uplink control channel in the preset time window are determined; determining an adjustment reference value based on the random access instruction number of the uplink control channel and the high interference frame number of the uplink control channel; configuring access configuration parameters included in the ALOHA broadcast based on the adjustment reference value. Therefore, in the embodiment of the invention, the base station can detect the system access load, dynamically adjust the random access strategy and the random access opportunity according to the load, discretize the random access of the terminal and improve the access efficiency.
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Fig. 1 is a flowchart of a random access method in a professional digital cluster according to an embodiment of the present invention.
Fig. 2 is a block diagram of a random access device in a professional digital cluster according to an embodiment of the present invention.
Fig. 3 is a block diagram of a random access device in a professional digital cluster having a memory-processor architecture according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings.
For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "comprising" means "including but not limited to", "according to '8230;' 8230;" means "according to at least '8230;' 8230;, but not limited to only according to '8230;' 8230;". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.
The applicant found that: in the current PDT, a large number of terminals simultaneously initiate registration or application services, and a main control channel simultaneously performs random access. If the base station is only configured with few random access opportunities, the random access is collided and congested, and the base station cannot demodulate or sense the random access, so that the random access efficiency is influenced.
To solve this technical problem, the applicant has also found that: the base station can detect the system access load and dynamically adjust the random access strategy and the random access opportunity according to the load, so that the random access of the terminal is discretized, and the access efficiency is improved.
Fig. 1 is a flowchart of a random access method in a professional digital cluster according to an embodiment of the present invention.
As shown in fig. 1, the method includes:
step 101: and determining the random access instruction number of the uplink control channel in a preset time window and the high interference frame number of the uplink control channel in the preset time window.
Here, in one embodiment, the number of uplink control channel random access commands within the predetermined time window includes: the number of registration instructions (REG _ SRV) and the number of service instructions (ST _ SRV) within a predetermined time window, and so on.
The uplink control channel high interference frame is defined as: an upstream control channel frame with a Received Signal Strength Indication (RSSI) measurement of a single frame above a predetermined threshold and no correct demodulation signaling Cyclic Redundancy Check (CRC). Here, the base station detects and determines the number of the uplink control channel random access commands in a preset time window and the number of the uplink control channel high-interference frames in the preset time window.
Step 102: and determining an adjustment reference value based on the random access instruction number of the uplink control channel and the high interference frame number of the uplink control channel.
Furthermore, within the time window (Tw), the data is recorded by dividing the time window into n sampling points. In one embodiment, the determining, in step 101, the random access instruction number of the uplink control channel in a predetermined time window and the high interference frame number of the uplink control channel in the predetermined time window includes: determining N sampling points in the preset time window, wherein N is a positive integer at least equal to 1; and determining the random access instruction number of the uplink control channel of each sampling point and the high interference frame number of the uplink control channel of each sampling point. Correspondingly, the step 102 of determining an adjustment reference value based on the number of the uplink control channel random access commands and the number of the uplink control channel high interference frames includes: for each sampling point, summing the random access instruction number of the uplink control channel of the sampling point and the high interference frame number of the uplink control channel of the sampling point, and dividing the summation result by the total number of the frames of the uplink control channel to determine the reference value of the sampling point; and determining the linear average value of the reference values of the N sampling points as the adjustment reference value.
For example, when processing various uplink call signaling sent by the mobile station (C _ RAND), the BBU on the base station side records the number (Creg) of C _ RAND commands and the number (HiIfNum) of high interference frames of the registration request, counts the Creg and the HiIfNum of each sampling point by n sampling points within a certain time window range (Tw), and performs a ratio with the total number (Tsum) of uplink control channel frames in the sampling points respectively to calculate the Srsample of each sampling point. Wherein:
Srsample＝(Creg+HiIfNum)/Tsum*100％。
then, the value obtained by performing linear average operation on Srsample of each sampling point in Tw is Sr value, which can be used as a reference value for dynamically adjusting the random access parameter of the system. And deleting the sampling point data with the farthest time and always keeping the effective sampling data in the latest continuous time window length when new sampling point data are added every time along with the lapse of time.
Step 103: configuring access configuration parameters included in an ALOHA broadcast based on the adjustment reference value.
The process shown in fig. 1 may be performed in a loop and the adjustment reference value for each predetermined time window is recorded.
In one embodiment, the configuring the access configuration parameters included in the ALOHA broadcast based on the adjustment reference value in step 103 includes: and if the adjustment reference value is larger than that of the last preset time window, increasing the maximum time for waiting for the response of the base station after the terminal sends the access message.
It can be seen that when the adjustment reference value is larger than the adjustment reference value of the previous predetermined time window, it can be assumed that a large number of terminals are present, and therefore the maximum time for the terminal to wait for the base station to respond after sending the access message, which is included in the ALOHA broadcast content, is correspondingly increased. After the terminal receives the ALOHA broadcast content, the maximum time (WT) for waiting for the response of the base station after sending the access message is correspondingly increased based on the broadcast content, thereby preventing the random access of the terminal from collision and congestion.
In one embodiment, the configuring the access configuration parameters included in the ALOHA broadcast based on the adjustment reference value in step 103 includes: and if the adjustment reference value is larger than the adjustment reference value of the last preset time window, increasing the random back-off maximum time (BackOff) for retransmitting the access message after the terminal waits for the maximum time of the response of the base station after sending the access message.
It can be seen that when the adjustment reference value is larger than the adjustment reference value of the previous predetermined time window, it can be assumed that a large number of terminals are present, and thus the maximum random backoff time for the terminal to retransmit the access message after waiting for the maximum time for the base station to respond after transmitting the access message, which is included in the ALOHA broadcast content, is correspondingly increased. After the terminal receives the ALOHA broadcast content, the maximum random backoff time for retransmitting the access message after the terminal waits for the maximum time of the response of the base station after sending the access message is correspondingly increased based on the broadcast content, thereby preventing the random access of the terminal from collision and congestion.
In one embodiment, the configuring the access configuration parameters included in the ALOHA broadcast based on the adjustment reference value in step 103 includes: and if the adjustment reference value is larger than that of the last preset time window, reducing the range of the random access inviting users.
It can be seen that when the adjustment reference value becomes larger than that of the last predetermined time window, it can be assumed that a large number of terminals are present, and thus the random access inviting user range (SF) included in the ALOHA broadcast content is correspondingly reduced.
For example, when the SF value is 00, it indicates to invite all services to join randomly; when the SF value is 01, the random access service of the service channel is applied or random access registration is invited; when the SF value is 10, the random access service of the non-service channel is applied or random access registration is invited; when the SF value is 11, it indicates that only random access registration or emergency voice service is invited. Assuming that the SF value at the previous predetermined time window is 00, when the adjustment reference value of the current predetermined time window is larger than the adjustment reference value of the previous predetermined time window, the SF may be adjusted to 01, 10 or 11, thereby reducing the range of the random access inviting user. Assuming that the SF value at the previous predetermined time window is 01, when the adjustment reference value of the current predetermined time window is larger than the adjustment reference value of the previous predetermined time window, the SF may be adjusted to 10 or 11, thereby reducing the range of the random access invited user. Assuming that the SF value at the previous predetermined time window is 10, when the adjustment reference value of the current predetermined time window is larger than the adjustment reference value of the previous predetermined time window, the SF may be adjusted to 11, thereby reducing the range of the random access invited user.
In one embodiment, the configuring the access configuration parameters included in the ALOHA broadcast based on the adjustment reference value in step 103 includes: and if the adjustment reference value is smaller than the adjustment reference value of the previous preset time window, reducing the maximum time for waiting for the response of the base station after the terminal sends the access message.
It can be seen that when the adjustment reference value is smaller than the adjustment reference value of the previous predetermined time window, it can be assumed that the number of terminals is reduced and the access load is reduced, and thus the maximum time for waiting for the base station to respond after the terminal included in the ALOHA broadcast content sends the access message can be correspondingly reduced. After receiving the ALOHA broadcast content, the terminal correspondingly reduces the maximum time for waiting for the response of the base station after sending the access message based on the broadcast content, thereby improving the access efficiency.
In one embodiment, the configuring the access configuration parameters included in the ALOHA broadcast based on the adjustment reference value in step 103 includes: and if the adjustment reference value is smaller than that of the previous preset time window, the longest random back-off time for retransmitting the access message after the terminal waits for the maximum time of the response of the base station after sending the access message is reduced.
It can be seen that when the adjustment reference value is smaller than the adjustment reference value of the previous predetermined time window, it can be assumed that the number of terminals is reduced and the access load is reduced, so that the maximum random back-off time for retransmitting the access message after the terminal included in the ALOHA broadcast content waits for the maximum time for the base station to respond after transmitting the access message can be correspondingly reduced. After the terminal receives the ALOHA broadcast content, the maximum random backoff time for retransmitting the access message after the terminal waits for the maximum time of the response of the base station after sending the access message is correspondingly reduced based on the broadcast content, thereby improving the access efficiency.
In one embodiment, the configuring the access configuration parameters included in the ALOHA broadcast based on the adjustment reference value in step 103 includes: and if the adjustment reference value is smaller than that of the last preset time window, increasing the range of the random access inviting users.
It can be seen that when the adjustment reference value becomes smaller than the adjustment reference value of the last predetermined time window, it can be assumed that the number of terminals is decreased and the access load is decreased, and thus the random access invitation user range (SF) included in the ALOHA broadcast content is correspondingly increased, thereby improving the access efficiency.
For example, when the SF value is 00, it indicates to invite all services to join randomly; when the SF value is 01, the random access service of the service channel is applied or random access registration is invited; when the SF value is 10, the random access service of the non-service channel is applied or random access registration is invited; when the SF value is 11, it means that only random access registration or emergency voice service is invited. Assuming that the SF value at the last predetermined time window is 11, when the adjusted reference value of the current predetermined time window becomes smaller than the adjusted reference value of the last predetermined time window, the SF may be adjusted to 00, 01, or 10, thereby increasing the range of the random access inviting user. Assuming that the SF value at the last predetermined time window is 10, when the adjusted reference value of the current predetermined time window becomes smaller than the adjusted reference value of the last predetermined time window, the SF may be adjusted to 00 or 01, thereby increasing the range of the random access invited user. Assuming that the SF value at the previous predetermined time window is 01, when the adjustment reference value of the current predetermined time window is smaller than the adjustment reference value of the previous predetermined time window, the SF may be adjusted to 00, thereby increasing the range of the random access invited users.
For example, the base station triggers a check each time the Sr value is refreshed to configure ALOHA broadcast downlink parameters as in table 1 below. In principle, after the WT time in the issued parameter is up, the terminal retransmits the maximum random Backoff time (Backoff) of the C _ RAND, the random access invitation user range message (SF), and the terminal sends the access C _ RAND message, and then waits for the corresponding maximum time (WT) parameter index of the base station to change along with the Sr value, wherein the Sr value is larger and the value is larger.
Table 1 is an ALOHA broadcast transmission parameter schematic table.
Figure BDA0002257362120000101
TABLE 1
It can be seen that when Sr is 25%, the base station assumes that the access load is slight, and therefore the values of the Backoff index, the SF index, and the WT index are low. At this time, the Backoff index obtained by query is 4; the SF index is 0; the WT index is 4. Then, the base station respectively queries a Backoff value, an SF value and a WT value based on the Backoff index, the SF index and the WT index, wherein the Backoff value increases with the increase of the Backoff index, the SF value increases with the increase of the SF index, and the WT value increases with the increase of the WT index. And finally, the base station transmits the Backoff value, the SF value and the WT value to the terminal through ALOHA broadcasting.
When Sr is 50%, the base station determines that the access load is normal, so that the values of the Backoff index, the SF index and the WT index are normal. At the moment, the Backoff index is obtained by query and is 7; the SF index is 1; the WT index is 7. Then, the base station respectively queries a Backoff value, an SF value and a WT value based on the Backoff index, the SF index and the WT index, wherein the Backoff value increases with the increase of the Backoff index, the SF value increases with the increase of the SF index, and the WT value increases with the increase of the WT index. And finally, the base station transmits the queried Backoff value, SF value and WT value to the terminal through ALOHA broadcast. It can be seen that the Backoff, SF, and WT values at 50% Sr are all increased as compared to the Backoff, SF, and WT values at 25% Sr, respectively.
When the Sr is 75%, the base station determines that the access load is more, so the values of the Backoff index, the SF index and the WT index are all larger. At this time, the Backoff index obtained by query is 11; the SF index is 2; the WT index is 11. Then, the base station respectively queries a Backoff value, an SF value and a WT value based on the Backoff index, the SF index and the WT index, wherein the Backoff value increases with the increase of the Backoff index, the SF value increases with the increase of the SF index, and the WT value increases with the increase of the WT index. And finally, the base station transmits the queried Backoff value, SF value and WT value to the terminal through ALOHA broadcast. It can be seen that the Backoff, SF, and WT values at 75% Sr are all increased as compared to the Backoff, SF, and WT values at 50% Sr, respectively.
When the Sr is 90%, the base station considers that the access load is much, so the values of the Backoff index, the SF index and the WT index are all larger. At this time, the Backoff index is 15 through query; the SF index is 3; the WT index is 15. Then, the base station respectively queries a Backoff value, an SF value and a WT value based on the Backoff index, the SF index and the WT index, wherein the Backoff value increases with the increase of the Backoff index, the SF value increases with the increase of the SF index, and the WT value increases with the increase of the WT index. And finally, the base station transmits the queried Backoff value, SF value and WT value to the terminal through ALOHA broadcast. It can be seen that the Backoff value, SF value, and WT value, which are issued when Sr is 90%, are all increased as compared to the Backoff value, SF value, and WT value, respectively, which are issued when Sr is 75%.
Also, when Sr is lower than a predetermined threshold value to determine that Sr is low (e.g., 25% as shown in table 1), the current delivery mechanism is maintained for downlink signaling; when Sr is higher than the predetermined threshold to determine that Sr is high (e.g., greater than 25% as shown in table 1), the downlink WACKD signaling (C _ WACKD) and the downlink ACKD signaling (C _ ACKD) that the base station responds to the registration procedure are sent only once for downlink signaling, thereby further preventing the control channel from being blocked.
Table 1 is only exemplary and is not intended to limit the scope of the embodiments of the present invention. In fact, the Sr range and the broadcast parameters in table 1 are adjustable.
Fig. 2 is a block diagram of a random access device in a professional digital cluster according to an embodiment of the present invention. The device is applied to a base station.
As shown in fig. 2, the apparatus includes:
a first determining module 201, configured to determine a random access instruction number of an uplink control channel in a predetermined time window and a high interference frame number of the uplink control channel in the predetermined time window;
a second determining module 202, configured to determine an adjustment reference value based on the number of the uplink control channel random access instructions and the number of the uplink control channel high interference frames;
an adjusting module 203, configured to configure access configuration parameters included in the ALOHA broadcast based on the adjustment reference value.
In one embodiment, the first determining module 201 is configured to determine N sampling points within the predetermined time window, where N is a positive integer of at least 1; determining the random access instruction number of the uplink control channel of each sampling point and the high interference frame number of the uplink control channel of each sampling point; a second determining module 202, configured to sum, for each sampling point, the random access instruction number of the uplink control channel of the sampling point and the high interference frame number of the uplink control channel of the sampling point, and divide the sum result by the total number of the uplink control channel frames to determine a reference value of the sampling point; and determining the linear average value of the reference values of the N sampling points as the adjustment reference value.
In one embodiment, the number of uplink control channel random access commands within the predetermined time window includes: the number of registration commands and the number of service commands within a predetermined time window.
In one embodiment, the adjusting module 203 is configured to perform at least one of the following: if the adjustment reference value is larger than the adjustment reference value of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is increased; if the adjustment reference value is larger than that of the last preset time window, the longest random back-off time for retransmitting the access message after the terminal waits for the maximum time of the base station response after sending the access message is increased; if the adjustment reference value is larger than the adjustment reference value of the last preset time window, reducing the range of the random access invitation user; if the adjustment reference value is smaller than the adjustment reference value of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is reduced; if the adjustment reference value is smaller than the adjustment reference value of the last preset time window, the longest random backoff time for retransmitting the access message after the terminal waits for the maximum time of the response of the base station after sending the access message is reduced; and if the adjustment reference value is smaller than the adjustment reference value of the last preset time window, increasing the range of the random access inviting user.
The embodiment of the invention also provides a random access device in the professional digital cluster with the memory-processor architecture.
Fig. 3 is a block diagram of a random access device in a professional digital cluster having a memory-processor architecture according to an embodiment of the present invention.
As shown in fig. 3, the random access apparatus in the professional digital cluster includes: a processor 301 and a memory 302; in which memory 302 an application program is stored that is executable by the processor 401 for causing the processor 301 to perform the random access method in a professional digital cluster as described in any of the above.
The memory 302 may be embodied as various storage media such as an electrically erasable programmable read-only memory (EEPROM), a Flash memory (Flash memory), and a programmable read-only memory (PROM). The processor 301 may be implemented to include one or more central processors or one or more field programmable gate arrays that integrate one or more central processor cores. In particular, the central processor or central processor core may be implemented as a CPU or MCU.
It should be noted that not all steps and modules in the above flows and structures are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The division of each module is only for convenience of describing adopted functional division, and in actual implementation, one module may be divided into multiple modules, and the functions of multiple modules may also be implemented by the same module, and these modules may be located in the same device or in different devices.
The hardware modules in the various embodiments may be implemented mechanically or electronically. For example, a hardware module may include a specially designed permanent circuit or logic device (e.g., a special purpose processor such as an FPGA or ASIC) for performing specific operations. A hardware module may also comprise programmable logic devices or circuits (e.g., including a general-purpose processor or other programmable processor) that are temporarily configured by software to perform certain operations. The implementation of the hardware module in a mechanical manner, or in a dedicated permanent circuit, or in a temporarily configured circuit (e.g., configured by software), may be determined based on cost and time considerations.
The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform a method as described herein. Specifically, a system or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any of the embodiments described above is stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program code stored in the storage medium. Further, part or all of the actual operations may be performed by an operating system or the like operating on the computer by instructions based on the program code. The functions of any of the above-described embodiments may also be implemented by writing the program code read out from the storage medium to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causing a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on the instructions of the program code.
Embodiments of the storage medium for supplying the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer or the cloud by a communication network.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative. For the sake of simplicity, the drawings are only schematic representations of the parts relevant to the invention, and do not represent the actual structure of the product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "a" does not mean that the number of the relevant portions of the present invention is limited to "only one", and "a" does not mean that the number of the relevant portions of the present invention "more than one" is excluded. In this document, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A random access method in a professional digital trunking, wherein the method is applied to a base station, and the method comprises:
determining the random access instruction number of an uplink control channel in a preset time window and the high interference frame number of the uplink control channel in the preset time window;
determining an adjustment reference value based on the random access instruction number of the uplink control channel and the high interference frame number of the uplink control channel;
configuring an access configuration parameter included in an ALOHA broadcast based on the adjustment reference value;
the determining the random access instruction number of the uplink control channel in the preset time window and the high interference frame number of the uplink control channel in the preset time window comprises: determining N sampling points in the preset time window, wherein N is a positive integer at least equal to 1; determining the random access instruction number of the uplink control channel of each sampling point and the high interference frame number of the uplink control channel of each sampling point;
the determining an adjustment reference value based on the uplink control channel random access instruction number and the uplink control channel high interference frame number comprises: for each sampling point, summing the random access instruction number of the uplink control channel of the sampling point and the high interference frame number of the uplink control channel of the sampling point, and dividing the summation result by the total number of the frames of the uplink control channel to determine the reference value of the sampling point; and determining the linear average value of the reference values of the N sampling points as the adjusting reference value.
2. The random access method in professional digital cluster according to claim 1, wherein said random access command number of uplink control channel in predetermined time window comprises: the number of registration instructions and the number of service instructions within a predetermined time window.
3. The random access method in professional digital cluster according to claim 1, wherein said configuring access configuration parameters included in ALOHA broadcasting based on adjustment reference value comprises at least one of:
if the adjustment reference value is larger than the adjustment reference value of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is increased;
if the adjustment reference value is larger than the adjustment reference value of the last preset time window, the longest random back-off time of the terminal for retransmitting the access message after waiting for the maximum time of the response of the base station after sending the access message is increased;
if the adjustment reference value is larger than that of the last preset time window, reducing the range of random access inviting users;
if the adjustment reference value is smaller than that of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is reduced;
if the adjustment reference value is smaller than the adjustment reference value of the last preset time window, the longest random backoff time for retransmitting the access message after the terminal waits for the maximum time of the response of the base station after sending the access message is reduced;
and if the adjustment reference value is smaller than that of the last preset time window, increasing the range of the random access inviting users.
4. A random access apparatus in professional digital trunking, wherein the apparatus is applied to a base station, and the apparatus comprises:
the first determining module is used for determining the random access instruction number of the uplink control channel in a preset time window and the high interference frame number of the uplink control channel in the preset time window; the determining the random access instruction number of the uplink control channel in the preset time window and the high interference frame number of the uplink control channel in the preset time window comprises: determining N sampling points in the preset time window, wherein N is a positive integer at least equal to 1; determining the random access instruction number of the uplink control channel of each sampling point and the high interference frame number of the uplink control channel of each sampling point;
a second determining module, configured to determine an adjustment reference value based on the random access instruction number of the uplink control channel and the high interference frame number of the uplink control channel; the determining an adjustment reference value based on the random access instruction number of the uplink control channel and the high interference frame number of the uplink control channel comprises: for each sampling point, summing the random access instruction number of the uplink control channel of the sampling point and the high interference frame number of the uplink control channel of the sampling point, and dividing the summation result by the total number of the frames of the uplink control channel to determine the reference value of the sampling point; determining a linear average value of the reference values of the N sampling points as the adjustment reference value;
an adjustment module for configuring access configuration parameters included in an ALOHA broadcast based on the adjustment reference value.
5. The random access device in professional digital cluster as claimed in claim 4, wherein said number of uplink control channel random access commands in a predetermined time window comprises: the number of registration instructions and the number of service instructions within a predetermined time window.
6. Random access device in a professional digital cluster according to claim 4,
an adjustment module to perform at least one of:
if the adjustment reference value is larger than the adjustment reference value of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is increased;
if the adjustment reference value is larger than the adjustment reference value of the last preset time window, the longest random back-off time of the terminal for retransmitting the access message after waiting for the maximum time of the response of the base station after sending the access message is increased;
if the adjustment reference value is larger than the adjustment reference value of the last preset time window, reducing the range of the random access invitation user;
if the adjustment reference value is smaller than the adjustment reference value of the last preset time window, the maximum time for waiting for the response of the base station after the terminal sends the access message is reduced;
if the adjustment reference value is smaller than that of the last preset time window, the longest random backoff time for retransmitting the access message after the terminal waits for the maximum time of the base station response after sending the access message is reduced;
and if the adjustment reference value is smaller than the adjustment reference value of the last preset time window, increasing the range of the random access inviting user.
7. A random access device in a professional digital cluster is characterized by comprising a processor and a memory;
the memory has stored therein an application executable by the processor for causing the processor to perform the method of random access in a professional digital cluster as claimed in any one of claims 1 to 3.
8. A computer readable storage medium having stored therein computer readable instructions for performing the method of random access in a professional digital cluster as claimed in any one of claims 1 to 3.
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