High-speed downward grouped access-in flow control method

Abstract

The method divides indicator value of channel quality of user into grades. Each grade is corresponding to up threshold, low threshold of each media access control in high-speed (MAC-hs) queue. The method calculates dispatching speed of data of radio link control (RLC) layer in radio network control (RNC). The invention changes calculation of fixed up threshold, low threshold of MAC-hs queue to variety dependent on user's channel quality. Being able to load change of user's mobility and cell, flow control method provides advantages: reducing discarded data quantity greatly compared to current method when switching user's cell occurs; shortening detaining time of user's data in MAC-hs, and reducing possibility of resetting radio load supporting service in RLC layer when channel environment is poor; guaranteeing expectant high speed rate.

Description

technical field [0001] The invention relates to a high-speed downlink shared channel (HS-DSCH) technology in a wideband code division multiple access (WCDMA) system, in particular to a high-speed downlink packet access (HSDPA) flow control method. Background technique [0002] The Release5 version of the WCDMA system supports the HS-DSCH channel, which can provide high-speed downlink packet data transmission. During data transmission on the HS-DSCH channel, there is a high-speed medium access control (MAC-hs) entity in the base station (NodeB), which establishes a data buffer space for each user carried on the HS-DSCH for storing The user needs to send data on the HS-DSCH channel, and the data is stored in the cache of the MAC-hs in the form of a queue. The HSDPA flow control method used to control MAC-hs entity cache, according to certain principles, decides that the radio link control layer (RLC) in the radio network controller (RNC) sends the data in the MAC-hs cache to ...

AI Technical Summary

Problems solved by technology

[0003] The HSDPA flow control method determines the amount of data stored in each user's queue. If the stored data is insufficient, it may not be able to provide enough data when a large amount of data needs to be sent, resulting in a decrease in the transmission rate; if the stored data is too much, it will There are the following problems: (1) excessive data loss will be caused when cell switching occurs, and call drop is likely to be caused; (2) the residence time of each data unit in NodeB is too long, resulting in long transmission time delay, affecting the quality of service; (3) making the transmission delay of the data unit in an uncertain state, which brings difficulties to related parameter configuration

[0009] In the existing HSDPA flow control method, the queue threshold is fixed, and the MAC-hs queue buffer is always filled relatively full, which cannot adapt to changes in the wireless environment and user mobility:

[0010] If the configured maximum threshold is relatively small, then when the channel environment is relatively good, it cannot provide enough data to send, so that the user's sending rate cannot reach the expected maximum value;

[0011] If the configured maximum threshold is relatively large, then when the channel environment deteriorates, a large amount of data will be stored in the MAC-hs queue for a long time, which will lead to an increase in RLC retransmission, or even reset and call drop; Especially when the handover cell is in a different base station, the data in the queue will be discarded. The longer the queue, the more data will be discarded, and the possibility of call drop will be greater.

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