GB/T 31024.4-2019Cooperative intelligent transportation systems—Dedicated short range communications—Part 4: Equipment application specification (English PDF)

6.2 Requirements for equipment function state

The RSU working state shall support at least the following five working states:

a) Initial state: RSU does not contain any user configuration information when it is in the initial state; RSU returns to the initial state after performing the initialization operation;

b) Standby state: When RSU is in the standby state, it supports the configuration function of the host computer to the equipment, and the radio function is turned off at this time;

c) Standby power-off state: RSU enters the standby power-off state after the power is off in the standby state; RSU in the standby power-off state enters the standby state after the power is on;

d) Running state: When RSU is in the running state, it works normally according to the relevant user configuration, all the radio frequency functions are turned on, and the configuration function to the equipment is turned off at the same time;

e) Running power-off state: RSU enters the running power-off state after the power is off in the running state; RSU in running power-off state enters the running state after the power is on.

6.3 Requirements for forwarding

The forwarding shall meet the following requirements:

a) When DSU uses DSMP communication, it supports two sending modes, i.e. storing-and-forwarding and direct forwarding, of DSMP messages, and it supports the receiving and forwarding of DSMP messages sent by other DSRC equipment.

d) When forwarding a DSMP message, it searches the forwarding configuration information in the corresponding MIB according to the AID in the message, and forwards the message to the correct application system.

e) The MIB information of the store-and-forward configuration meets the requirements of GB/T 31024.3.

f) It supports the keeping and maintenance of equipment time, the time precision is no more than 10 ms, and supports the time adjustment through Beidou or NTP; when the system works, the Beidou is the main clock.

g) When the time adjustment fails, the alarm is reported through the SNMP V3 protocol.

h) The internal time format follows the UTC standard time format, starting at 0:00 on January 1, 1970.

8.5.2 RSU position function

The RSU position function shall meet the following requirements:

a) It configures the Beidou positioning module to achieve the positioning function;

b) RSU in running state reports the alarm through the SNMP V3 protocol when the positioning fails.

c) It supports the configuration of the legal running area, and reports the alarm through the SNMP V3 protocol when the positioning position is not in the legal running area.

8.5.3 RSU system log function

The RSU system log function requirements are as follows:

a) It shall support 8 levels of log function, including: emergency (level 1), alarm (level 2), critical (level 3), error (level 4), warning (level 5), notification (level 6), information (level 7), debugging (level 8);

b) It is advisable to adopt an open source operating system and implement conversion of its own log to operating system logs;

c) The level 1 ~ 5 logs that appear shall be written to the log file and saved and guaranteed to not be lost when power is off.

8.5.6 RSU equipment security

The RSU equipment security shall have the following functions:

a) The system is protected by the user name and password. The password is guaranteed to be complex and is prompted to replace regularly through the system.

b) The system supports the maximum number of retries after the password is incorrectly configured; the specific number of times is configured by the service operator;

c) The system supports multiple management users and can configure management rights for different users;

d) It supports China national cryptographic algorithms, which are used for certificate, signature and encryption authentication;

e) The system supports the initialization operation. It clears all user data after initialization and returns to the factory settings;

f) It supports IP address-based access to ACL. Only the IP address in the ACL can access RSU;

g) RSU supports data encryption storage;

h) It supports WEB-based management interfaces. WEB-based management interfaces use HTTPS encryption;

i) When the NTP protocol is used to synchronize time, NTP packets are signed and authenticated.

j) It provides integrity verification capabilities for store-and-forward data;

k) When reading the DSRC message of verification failure, storing the forwarding data, and generating a failed login attempt, the alarm is reported through the SNMP V3 protocol to the management system;

l) It supports the shell anti-detachment function. When the shell is detached, the alarm is reported through the SNMP V3 protocol to the management system.

8.5.8 RSU configuration functions

The RSU configuration shall include the following functions:

a) It supports the overall initialization of the system with the internally stored configuration parameters;

b) The RF output power of RSU is configurable;

c) When it is fresh from the factory or reset to factory-fresh condition, it will enter the standby state from the initial state after the power is on;

d) It supports the standby command issued by the receiving management system to enter the standby state from the running state;

e) It supports the running command issued by the receiving management system to enter the running state from the standby state;

f) It supports to enter the running power-off state when it suddenly loses power in the running state, which will not cause damage to the file system;

g) It supports to enter the running state or standby state respectively after the power is on in the running power-off state or the standby power-off state;

h) It supports the factory reset command, and clears all the configuration information and enters the initial state after receiving the factory reset command;

i) It keeps the running state according to the working time sent downstream by the application system or the management system after the running state is disconnected from the application system, and enters the standby state after the working time is out;

j) It supports the reporting of the health status of the equipment, including the memory usage, the CPU usage, the file system usage, the running time, the management user login information, and the statistics of the number of data packets of each application identification sent and received by each protocol;

k) The configuration file of RSU supports export and import. When the equipment is faulty, it can quickly import the previous data and resume normal operation.

l) The application-independent configuration of RSU supports default values;

m) RSU supports remote configuration over a wide area network. […]