Transmission method against physical random access channel transmission delay

Abstract

The invention relates to a transmission method of physical random access channel transmission time delay, wherein it comprises that: a, in base station, segmented setting quantized unit of transmission time delay, while the value of quantized unit is increased along with increased distance; b, base station converts the measured time delay value to the transmission time delay report value via the quantized unit, writes the report value into frame protocol pack, to be sent to the wireless network controller; c, wireless network controller obtains and stores the report value; d, wireless network controller sends report value to base station; e, base station obtains the report value, to recover the real transmission time delay. The inventive method can apply wide cover condition whose radius is over 60km, without changing the bit width of transmission time delay in FP pack.

Description

technical field [0001] The invention relates to wireless network technology in the communication field, in particular to a transmission method for transmission time delay of a physical random access channel. Background technique [0002] In wideband code division multiple access (WCDMA) frequency division multiplexing (FDD) mode, the one-way transmission delay (Transport propogation, Tp, or Propagation Delay) of the air interface is determined by the random physical access channel (Physical random access channel, PRACH) calculated. In the 3rd Generation Partnership Project (3GPP) 25.133 protocol, it is stipulated that the measurement accuracy of random physical access channel transmission delay is + / -2chips, the quantification unit is 3chips, and the range is 0-765chips. [0003] The Node B reports the reported value of the transmission delay Tp to the Radio Network Controller (RNC) in the form of a frame protocol (Frame Protocol, FP) packet. In the 25.435 protocol, it is ...

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Problems solved by technology

[0004] However, in the existing FP packet reported by Node B to RNC, the value range of Tp reported value is 0-255, and the quantization unit is 3chips, the corresponding maximum cell coverage radius can only be 60 kilometers

In the case of wide coverage, the radius of the cell may be greater than 60 kilometers, up to hundreds of kilometers or even 200 kilometers. At this time, if the quantization unit is 3chips, the reported value of Tp with a bit width of 8bits will not be able to represent the air in the distance (greater than 60 kilometers) The one-way propagation delay of the interface, the actual transmission delay of the physical random access channel may be much greater than 765chips, for example, at 120 kilometers, 120*1000 / 78.125(1chip=78.125m)=1536chips, the actual transmission time at this time The value after quantization with 3chips is 512 (1536 / 3), which cannot be represented by 8bits (oxFF=255), that is, it exceeds the range of Tp reported value and the maximum value is 255, thus limiting the practical application

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