TypeScript 5G 网络：用类型安全构建移动通信的未来

            
// Plain JavaScript - easy to make mistakes
function createNetworkSlice(config) {
  // What if config.sliceId is misspelled as 'sliceID'? Runtime error or silent failure.
  // What if config.downlinkThroughput is '1 Gbps' instead of a number in Mbps? Runtime error.
  // No help from the editor, no validation before running.
  console.log(`Creating slice ${config.sliceId} for service type ${config.serviceType}`);
  // ... code to make an API call with the config object
}

// A potentially faulty call that would only fail at runtime
createNetworkSlice({
  sliceId: 'iot-slice-001',
  serviceType: 'eMBB', // Oops, a typo! Should be 'SST' (Slice/Service Type) key
  downlinkThroughput: '1000' // This is a string, but the API expects a number
});

            

              
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// TypeScript - Define the shape of the data
interface Throughput {
  rate: number; // in Mbps
  unit: 'Mbps' | 'Gbps';
}

interface NetworkSliceConfig {
  sliceId: string;
  sst: 'eMBB' | 'URLLC' | 'mMTC'; // Slice/Service Type - only allow valid values
  uplink: Throughput;
  downlink: Throughput;
  maxSubscribers?: number; // Optional property
}

// The function now requires a valid configuration object
function createNetworkSlice(config: NetworkSliceConfig): Promise<{ success: boolean, sliceId: string }> {
  // If we try to access config.serviceType, the compiler gives an error!
  // If we pass a string for downlink.rate, the compiler gives an error!
  console.log(`Creating slice ${config.sliceId} for service type ${config.sst}`);
  // ... code to make a validated API call
  return Promise.resolve({ success: true, sliceId: config.sliceId });
}

// This call would fail at compile time, not in production!
/*
createNetworkSlice({
  sliceId: 'iot-slice-001',
  serviceType: 'eMBB', // Error: Property 'serviceType' does not exist. Did you mean 'sst'?
  downlink: { rate: '1000', unit: 'Mbps' }, // Error: Type 'string' is not assignable to type 'number'.
  uplink: { rate: 50, unit: 'Mbps' }
});
*/

// A correct call that is validated by the compiler
createNetworkSlice({
  sliceId: 'drone-control-slice-002',
  sst: 'URLLC',
  downlink: { rate: 200, unit: 'Mbps' },
  uplink: { rate: 50, unit: 'Mbps' }
});

            

              
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import axios from 'axios';

// Define types for the AMF's UE registration API
// These would ideally come from a shared library or be auto-generated from an OpenAPI spec

interface UeContext {
  supi: string; // Subscription Permanent Identifier
  imei: string;
  servingPlmnId: string;
}

interface RegistrationRequest {
  ueContext: UeContext;
  accessType: '3GPP_ACCESS' | 'NON_3GPP_ACCESS';
}

interface RegistrationResponse {
  status: 'REGISTERED' | 'DEREGISTERED';
  assignedGuti: string; // Globally Unique Temporary Identifier
}

class AmfApiClient {
  private baseUrl: string;

  constructor(baseUrl: string) {
    this.baseUrl = baseUrl;
  }

  // Method signature enforces correct input and promises a correctly shaped output
  async registerUe(request: RegistrationRequest): Promise<RegistrationResponse> {
    try {
      const response = await axios.post<RegistrationResponse>(
        `${this.baseUrl}/ue-contexts/registrations`,
        request
      );
      // TypeScript ensures response.data matches the RegistrationResponse interface
      return response.data;
    } catch (error) {
      console.error("UE Registration Failed:", error);
      throw new Error('Failed to communicate with AMF');
    }
  }
}

// Usage is now type-safe
const amfClient = new AmfApiClient('http://amf.core.5g');
const newUe: UeContext = {
  supi: 'imsi-208930000000001',
  imei: '358512345678901',
  servingPlmnId: '20893'
};

amfClient.registerUe({ ueContext: newUe, accessType: '3GPP_ACCESS' })
  .then(result => {
    // We get autocompletion for result.status and result.assignedGuti
    console.log(`UE Registered Successfully. GUTI: ${result.assignedGuti}`);
  });

            

              
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// Hypothetical types for O-RAN E2 messages
interface E2NodeId {
  gNbId: string;
  cellId: string;
}

// A message indicating a handover is required
interface RICIndicationMessage {
  type: 'HO_REQUIRED';
  nodeId: E2NodeId;
  ueId: string;
  payload: {
    currentRSRP: number; // Reference Signal Received Power
    neighborCells: {
      cellId: string;
      rsrp: number;
    }[];
  };
}

// A control message to command a handover
interface RICControlMessage {
  type: 'HO_COMMAND';
  nodeId: E2NodeId;
  ueId: string;
  payload: {
    targetCellId: string;
  };
}

// Simplified xApp logic for load balancing
class LoadBalancingXApp {
  handleIndication(message: RICIndicationMessage): RICControlMessage | null {
    // Type safety ensures we can safely access message.payload.neighborCells
    if (message.type === 'HO_REQUIRED' && message.payload.currentRSRP < -110) {
      const bestNeighbor = message.payload.neighborCells.sort((a, b) => b.rsrp - a.rsrp)[0];
      
      if (bestNeighbor && bestNeighbor.rsrp > message.payload.currentRSRP) {
        console.log(`Initiating handover for UE ${message.ueId} to cell ${bestNeighbor.cellId}`);
        
        // The return type is checked by TypeScript, ensuring we send a valid command
        return {
          type: 'HO_COMMAND',
          nodeId: message.nodeId,
          ueId: message.ueId,
          payload: {
            targetCellId: bestNeighbor.cellId
          }
        };
      }
    }
    return null;
  }
}

            

              
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