Method for controlling up going admission based on actual measured quantity in CDMA system

Abstract

The method includes following steps: when no user accesses, periodic pretreatment for admission control is carried out; based on result of pretreatment for admission control, determining upper limit of transmitting power of new user; calculating lower limit of transmitting power of new user; determining whether maximal transmitting power of new user is between upper limit and lower limit; if yes, then up going admission is successful, and the said lower limit is as initial transmitting power of new user at the sub zone; if no, then sending message of failing admission. Not only considering influencing factor by new user on QoS of former users in system as accessing moment, the method also considers influence of power control action in system on QoS after new user is accessed so as to guarantee admission control in real time.

Description

technical field [0001] The present invention relates to an uplink admission control method in a Code Division Multiple Access (CDMA) mobile communication system, and in particular to an uplink admission control method based on actual measurements. The working principle of the method of the present invention is also applicable to all Code division multiple access mobile communication system. technical background [0002] Since the CDMA system is a self-interference system, users will interfere with each other. Especially in the uplink direction, CDMA systems are limited by interference. When a new user accesses the cell, the user will generate new interference to other users in the cell, causing the interference of other users to increase and the carrier-to-interference ratio to decrease. At this time, the transmit power of these users can be increased through power control , thereby increasing the load-to-interference ratio. However, this part of the rising power causes n...

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Problems solved by technology

[0006] The threshold value of received interference power in the traditional admission control method reflects a limit situation of the system, but since the threshold value is fixed, it can only reflect a worst case and cannot accurately reflect the signal power of users in the system and disturbance dynamics

Moreover, in the current uplink admission control method based on signal-to-interference ratio (SIR) measurement, since the CDMA system allows mixed service access, each service has different service quality requirements, so complex matrix operations or iterations are often involved. calculation, the calculation delay is very large, which makes it more difficult to ensure the real-time performance of admission control

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