Rate Assignment Algorithm for Forward Supplementary Channel

Abstract

The invention discloses a forward supplementary channel rate assignment algorithm, relates to the high-speed data download service in CDMA2000, and is invented for solving the problem that system resources cannot be fully utilized in the existing rate assignment. The rate dominance algorithm of the forward supplementary channel includes the following steps: (1) setting the condition parameter of the forward supplementary channel; (2) obtaining the current frame error rate of the forward supplementary channel used between the base station and the terminal; ( 3) According to the current frame error rate and condition parameters, the rate of the forward supplementary channel established in the next scheduling application is set. The present invention adjusts the rate of the forward supplementary channel in real time according to the current rate and the frame error rate, increases the data transmission rate as much as possible, and achieves full utilization of the channel. The invention is mainly used for rationally adjusting the rate of the forward supplementary channel of the high-speed data download service in CDMA2000.

Description

technical field [0001] The invention relates to the high-speed data download service in CDMA2000, in particular to the rate assignment algorithm of the forward supplementary channel (FSCH) of the high-speed data download service in the CDMA2000. Background technique [0002] CDMA2000 provides data download services. Low-speed data download services are realized through the establishment of basic channels (FCH) between terminals (including mobile phones, fixed stations, Internet cards, etc.) It is realized by establishing forward supplementary channels (FSCH) with different rates between them. The data transmission rate of the forward supplementary channel is expressed in the form of 1X, 2X, 4X, 8X, 16X, and 32X, where X is the basic rate. There are two basic rates specified in the IS2000 standard: 9600bit / s and 14400bit / s. The higher the data transmission rate, the more resources the system allocates to the physical channel, and the two are directly proportional. The resou...

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Problems solved by technology

[0003] If a high-speed FSCH needs to be established between the terminal and a certain cell of the base station, the base station will determine the rate of the FSCH that can actually be established according to the currently available wireless resources of the cell. The wireless resources mainly include CE (channel element), available WalshCode ( Walsh coding: a set of propagation codes with high-quality autocorrelation performance and poor cross-correlation performance) and the remaining power resources; if CE and WalshCode resources are sufficient, then the establishment of FSCH depends entirely on the remaining power of the cell, according to There may be the following two problems in determining the establishment of FSCH based on the remaining power: the algorithm is too conservative, and the assigned rate is too low, but in fact, a higher rate FSCH can be established, resulting in the user being unable to use the faster download rate that could have been used; The algorithm is too risky, and the assigned rate is too high. Even if the transmission power reaches the upper limit through power control, the frame error rate is very high, which leads to a very low download rate of effective data services. On the one hand, it wastes the power resources of the base station. It also prevents users from using higher-speed data download services

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