A self-adapted control method for time-division synchronization code division multi-address system

Abstract

The invention discloses a self-adaptive modulation control method for a time-division synchronization code-division multiple address (TD-SCDMA) system, wherein the steps are: a wireless network controller measures the quality of a first-directional channel, and determines whether the modulation mode is the orthogonal-phase keying modulation or the eight-phase keying modulation; when the modulation mode is one of the two modulation modes, determine whether the measurement value of the quality of the first-directional channel meets the preset first-directional judging criteria of the other modulation mode or not, and if yes, the first-directional modulation mode is changed and allocated into the other modulation mode. By dynamic control on the modulation mode according to the real-time channel quality, when the channel quality is good, the higher-level modulation mode of 8PSK is allocated for users, thereby enhancing the data transmission rate of users or reducing the channel resources occupied by users; when the channel quality is poor, the lower-level modulation mode of QPSK is allocated for users, thereby improving user service quality or enhancing system capacity.

Description

technical field [0001] The present invention relates to the field of TD-SCDMA (time division synchronous code division multiple access), in particular to a method for adaptive modulation control of a time division synchronous code division multiple access system in the packet switching domain in the state of a cell dedicated channel. Background technique [0002] In the TD-SCDMA system, once the UE (terminal, also called user equipment) needs to establish a service connection with the network, the RNC (Radio Network Controller, Radio Network Controller) will allocate resources for the UE and the NodeB (Node B, Also called base station) assigns the uplink and downlink data modulation modes of the physical layer. TD-SCDMA has been officially written into the Release4 version of 3GPP since March 2001. In this R4 version, the parameter value of its modulation is optional QPSK (Quadrature Phase Keying Modulation) or 8PSK (8 Phase Keying Modulation) ). [0003] The so-called dat...

AI Technical Summary

Problems solved by technology

That is, once the service is established, regardless of the wireless environment in which the user is located or the quality of the channel, the modulation method remains the same, and the channel resources used are also fixed; this static allocation method cannot make full use of dynamic changes. Optimum configuration of the modulation mode in accordance with the channel conditions will cause potential losses to the user's communication service quality or system capacity.

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