GA/T 2126-2023 in English
VALIDPolice Digital Trunking (PDT) Communication System Technical Specification for Interface between Mobile Switching Center and Base Station
- Issued on:2023-12-22
- Implemented on:2024-01-01
- File Format:PDF
- Delivery:Via email within 5 business days
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| Standard No: | GA/T 2126-2023 |
| Document status: | VALID |
| Title in English: | Police Digital Trunking (PDT) Communication System Technical Specification for Interface between Mobile Switching Center and Base Station |
| Title in Chinese: | 警用数字集群（PDT）通信系统 移动交换中心与基站间接口技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2023-12-22 |
| Implemented on: | 2024-01-01 |
| ICS Classification: | 33.060.01-Radiocommunications in general |
| Chinese Classification: | A90-Social and public safety in general |
| Professional Classification: | GA-Security |
| Related Keywords: | base station
group call members target base station base station introduction interpretation base station collaborative control large scale networking psip+snmp key technical requirements large cities base station heartbeat interval |
Introduction
Interpretation of the core content of the standard
GA/T 2126-2023 standard, as an important part of the PDT digital trunking communication system, specifies the key interface technical requirements between the mobile switching center (MSC) and the base station (BS). The standard was released in 2023, marking the further improvement of my country's police private network communication technology system.
Technical Architecture Analysis
| Architecture Type | Control Method | Applicable Scenarios | Protocol Support |
|---|---|---|---|
| Centralized | MSC Centralized Control | Small and Medium Scale Networking | pSIP/pSDP |
| Semi-distributed | MSC and Base Station Collaborative Control | Large Scale Networking | pSIP+SNMP |
Key Technical Requirements
4.1 System Control Method
The standard clearly supports two control modes: centralized and semi-distributed:
- Centralized: All control signaling is processed by the MSC, and the base station only forwards it
- Semi-distributed: Key control functions are delegated to the base station to reduce the load on the MSC
6.1 Call Control Interface Protocol
The improved pSIP protocol is adopted, and the following are added on the basis of the standard SIP protocol:
- Group call priority identification field
- Emergency call fast establishment mechanism
- PTT preemption conflict resolution algorithm
Typical application scenarios
Cross-base station group call establishment process
Taking Figure 37 in the standard as an example, the complete process includes:
- The calling base station initiates an INVITE request
- MSC locates group call members
- Target base station returns 200 OK response
- Media channel established (RTP/RTCP)
Typical delay requirement: ≤500ms (from PTT pressed to call establishment)
Implementation suggestions
Equipment selection requirements
- MSC equipment should support 2000+ concurrent call processing capabilities
- Base stations need to be compatible with SNMPv3 protocol for parameter configuration
- Interface modules need to pass GA/T 1059 security certification
System deployment suggestions
- Semi-distributed architecture is recommended for large cities
- Base station heartbeat interval is set to 30 seconds (Standard Figure 3)
- Dynamic group data synchronization period does not exceed 5 minutes
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