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CN-121985433-A - Backhaul link self-adaptive 5G emergency base station communication method and system

CN121985433ACN 121985433 ACN121985433 ACN 121985433ACN-121985433-A

Abstract

The invention relates to the technical field of mobile communication and emergency communication, in particular to a feedback link self-adaptive 5G emergency base station communication method and system, wherein an emergency base station continuously monitors the state of a feedback link between the emergency base station and a 5G core network; when the feedback link is detected to be interrupted or the link quality is lower than a threshold value, the base station automatically switches to a local emergency mode, stops the service to a core network and organizes local emergency communication by utilizing a local computing power unit, and broadcasts a local emergency mode indication, a public emergency ID list and emergency random access configuration through an extended system information block, and a terminal completes access registration and obtains a local emergency communication ID according to a special preamble sequence. In the local emergency mode, the terminals can realize local exchange communication through the relay of the emergency base station or direct device-to-device communication under the coordination of the base station, and the base station switches back to the standard access mode and notifies the terminals after the return link is recovered. The invention can ensure minimum necessary communication under extreme scenes and improve the reliability of emergency communication.

Inventors

  • XU FENG

Assignees

  • 几维通信技术(深圳)股份有限公司

Dates

Publication Date
20260505
Application Date
20260206

Claims (10)

  1. 1. The communication method of the 5G emergency base station with the self-adaptive backhaul link is characterized by comprising the following steps: Establishing or maintaining a backhaul link connection with a 5G core network after the emergency base station is powered on and started, and continuously monitoring the availability and stability of the backhaul link; When the backhaul link is stably available, the emergency base station works in a standard access mode as a standard gNB to provide communication service for accessing a 5G core network for a terminal in a coverage area; When the emergency base station detects that the return link is interrupted or the link quality is lower than a preset threshold value, the emergency base station automatically switches to a local emergency mode, in the local emergency mode, the emergency base station stops providing services to a core network and provides local emergency communication, and distributes unique local emergency communication ID (identity) for each terminal requesting access in a coverage range, wherein the local emergency communication ID is used for uniquely identifying and paging the terminal in the local emergency mode; The emergency base station broadcasts a local emergency mode entering notice through an extended system information block, wherein the extended system information block at least comprises a local emergency mode indication, a public emergency ID list available in a cell and random access configuration of terminal emergency communication access; after receiving the extended system information block, the terminal initiates a random access flow by adopting a special preamble sequence according to the random access configuration, applies for the emergency base station and obtains the local emergency communication ID so as to complete registration; in the local emergency mode, the terminals which have acquired the local emergency communication ID perform transfer communication through the emergency base station, or perform device-to-device direct communication under the coordination of the emergency base station; and when the emergency base station detects that the return link is recovered and stable, the emergency base station automatically switches back to the standard access mode and notifies the terminal through the system information block.
  2. 2. The backhaul link adaptive 5G emergency base station communication method of claim 1 wherein the continuous monitoring comprises obtaining a connection status, a round trip delay, an available bandwidth, and a packet loss rate of the backhaul link through ICMP probing and SCTP link detection, and generating a link quality report.
  3. 3. The backhaul link adaptive 5G booster base station communication method of claim 1, wherein the preset threshold comprises at least one of a latency threshold, a bandwidth threshold, and a packet loss rate threshold, and the booster base station employs a hysteresis threshold or continuously satisfies a time window policy to suppress pattern jitter.
  4. 4. The backhaul link adaptive 5G emergency base station communication method of claim 1 wherein the extended system information block is encapsulated as SIB1 extended information and broadcast within a cell, and further comprising a traffic type indication field, the traffic type indication field being an 8 bit string including at least indication bits of voice traffic, short message traffic, video telephony traffic, and data traffic.
  5. 5. The backhaul link adaptive 5G emergency base station communication method of claim 1 or 4 wherein the maximum number of public emergency ID lists is 64 and the public emergency IDs are 39 bit strings, wherein the random access configuration comprises an emergency preamble sequence range including at least an integer having a start index start of 1 to 63 and an integer having a length len of 1 to 64.
  6. 6. The backhaul link adaptive 5G emergency base station communication method of claim 1 wherein MSG1 transmitted when the terminal initiates the random access procedure uses the emergency preamble sequence, and wherein the emergency base station returns RRCReject a message to the terminal when MSG1 received by the emergency base station does not use the emergency preamble sequence.
  7. 7. The backhaul link adaptive 5G emergency base station communication method of claim 1 wherein the terminal sends an MSG5 containing an emergency registration request to the emergency base station after the RRC establishment is completed, the emergency registration request containing the identity ID of the terminal, the emergency base station forwards the emergency registration request to a local emergency communication management module, the local emergency communication management module allocates a 39-bit local emergency communication ID and records the mapping relationship between the identity ID and the local emergency communication ID in a database.
  8. 8. The backhaul link adaptive 5G emergency base station communication method of claim 1 or 7, wherein the local emergency communication ID is formed by combining a base station ID with a local ID, wherein the base station ID is used to distinguish between different emergency base stations, and the local ID is used to distinguish between different terminals within a coverage area of a same emergency base station.
  9. 9. The backhaul link adaptive 5G emergency base station communication method of claim 1, wherein the inter-terminal relay communication includes the source terminal sending an emergency communication request including a source side local emergency communication ID and a target side local emergency communication ID to the emergency base station, the local service processing module of the emergency base station querying the local emergency communication management module for routing information corresponding to the source side local emergency communication ID and the target side local emergency communication ID, and Paging the target terminal access through Paging messages to establish a communication connection between the source terminal and the target terminal.
  10. 10. The backhaul link self-adaptive 5G emergency base station system is characterized by comprising a local computing unit and a base station connected with the local computing unit: The backhaul link monitoring module is used for monitoring the connection state, time delay, bandwidth and packet loss rate of a backhaul link between the emergency base station and the 5G core network and generating a link quality report; the mode decision and switching control module is used for controlling the emergency base station to switch between a standard access mode and a local emergency mode according to the link quality report; an extended system information management module for generating an extended system information block including a local emergency mode entry notification and a random access configuration in a local emergency mode and broadcasting in a cell; a local emergency communication management module for generating, assigning, deactivating and performing conflict resolution local emergency communication IDs in a local emergency mode; And the local service processing module is used for processing the communication request between registered terminals in the local emergency mode and completing local exchange or cooperative device-to-device direct communication in the emergency base station.

Description

Backhaul link self-adaptive 5G emergency base station communication method and system [ Field of technology ] The invention relates to the technical field of mobile communication and emergency communication, in particular to a backhaul link self-adaptive 5G emergency base station communication method and system. [ Background Art ] In the scenarios of natural disasters, public safety events or network infrastructure impairments, etc., the fixed backhaul network (e.g., fiber, microwave) may be interrupted, resulting in paralysis of the macro base station that relies on the traditional backhaul link. At this time, emergency base stations (e.g., vehicle base stations, portable base stations) with satellite, wireless self-backhaul, etc. capabilities are deployed quickly to restore network coverage. However, the existing emergency base station technology has obvious defects: 1. The backhaul dependency is strong and most emergency base station operating modes still assume that the backhaul link between them and the core network is stably available. Once the backhaul link quality deteriorates or is completely broken (e.g., the satellite link is weather-affected, the wireless self-backhaul distance is too far away or suffers interference), the user equipment cannot conduct any communications, including critical emergency communications, even if the base station air interface is normal. 2. The autonomous local communication capability is lacking, and the existing standard does not specify how the base station autonomously organizes the terminals in the coverage area to perform point-to-point or local networking communication when the emergency base station is out of connection with the core network. The terminal can not sense the state change of the base station and can not carry out identity identification and paging under the condition of no support of a core network. Therefore, an intelligent and adaptive mechanism is needed to enable the emergency base station to automatically switch to a degraded but available local emergency mode when the backhaul link is unstable, so as to ensure minimal communication. [ Invention ] In order to overcome the above problems, the present invention provides a backhaul link adaptive 5G emergency base station communication method and system. The method comprises the steps of adding a local computing unit into an emergency base station, enabling the emergency base station to have dual-mode self-adaptive switching capability, wherein the emergency base station works as a standard base station when a return link is available, automatically degrading the emergency base station to a local emergency communication coordinator when the return link is not available, and organizing terminals in coverage area to perform local emergency communication. The technical scheme provided by the invention for solving the technical problems is as follows: A5G emergency base station communication method based on backhaul link state self-adaption comprises the following steps: and step 1, the emergency base station is powered on to try to establish or maintain the backhaul link connection with the 5G core network, and continuously monitor the availability and stability of the backhaul link. And 2, when the backhaul link is stably available, the emergency base station works in a standard access mode and serves as a standard gNB to provide communication service for accessing the 5G core network for the user equipment in the coverage area. Step 3, when the emergency base station detects that the return link is interrupted or the quality is lower than a preset threshold value, automatically switching to a local emergency mode, in the local emergency mode, stopping providing service to a core network by the emergency base station to provide local emergency communication, distributing unique local emergency communication ID for each terminal requesting access in a coverage area, using the unique ID and paging terminal in the local emergency mode, wherein the format of the unique ID and paging terminal can be simplified to a standard 5G-GUTI, and broadcasting a local emergency mode entry notice through an extended system information block, wherein the extended system information block at least comprises a mode indication, a public number list available in a local cell and random access configuration of terminal emergency communication access. And 4, analyzing and obtaining a mode switching instruction after receiving the extended system information block by the terminal in an idle state or a connected state, and initiating a random access flow by adopting a special preamble sequence according to the configuration in the extended system information block when the terminal has an emergency communication requirement, applying for and obtaining a local emergency communication ID from an emergency base station, thereby completing registration in a local emergency mode. And 5, in the local emergency mode, carrying out