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Higher Priority on UART1

How can I increase the interrupt priority of UART1 of the LPC2364?
Due to heavy load on timer interrupts, I'm missing receiving characters every 5 - 10 seconds.

The initialization of UART1 is as follow:

void enableUART1(void)
{
  VICVectAddr7  = (unsigned long) UART1_IRQHandler; // Set Interrupt Vector
  VICVectCntl7  = 17; //15;                         // use it for UART1 Interrupt
  VICIntEnable |= (1<<7);                           // Enable UART1 Interrupt
}

      // Enable RS485  P2.7 Initialisiert auf Out high
      PINSEL4 = PINSEL4|P2_00TXD1|P2_01RXD1;
      U1LCR   = bits|parity|stops|_DLABON;
      U1DLL   = (U8)baud;
      U1DLM   = (U8)(baud>>8);
      U1LCR   = bits|parity|stops|_DLABOFF;
      uart[_UART1].openChar1 =uart[_UART1].openChar2 =uart[_UART1].openChar3 =uart[_UART1].openChar4 =0;
      uart[_UART1].closeChar1=uart[_UART1].closeChar2=uart[_UART1].closeChar3=uart[_UART1].closeChar4=0;
      uart[_UART1].closeTimeout=timeout;
      flushBufferUART1( );
      U1IER   =(1<<0);        // Enable Rx Interrupt
      uart[_UART1].initialized=1;

Many thanks for any input.
Peter

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