CELL_FACH flow control method in HSPA+ system

Abstract

The invention discloses a CELL_FACH flow control method in an HSPA+ system. A length TFC_period of a period timer is preconfigured. The length TFC_period of the period timer is a flow control period. An end moment of the each flow control period is a period flow control point. The method comprises the following steps that: each subframe determines whether the period timer is expired; if the period timer is expired, a period timing triggering mode is used to perform the flow control of an Iub port; otherwise, a specific event triggering mode is used to perform the flow control of the Iub port. In the invention, aiming at the flow control of the Iub port in a CELL_FACH state, a complete solution scheme is provided. And by using the method of the invention, the flow of the Iub port under the CELL_FACH state in the HSPA+ system can be controlled.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a CELL_FACH flow control method in an HSPA+ system. Background technique [0002] In the High Speed ​​Packet Access Enhanced (HSPA+) system, the data transmission in the CELL_FACH state has been enhanced, which is mainly reflected in the following aspects: [0003] First, on the air interface, the downlink transmission in the CELL_FACH state no longer uses the FACH channel, but uses the high-speed downlink shared channel (HS-DSCH) like the CELL_DCH state, so the downlink transmission data rate in the HSPA+ system in the CELL_FACH state is obtained It has been improved, and the types of downlink transmission services are more diverse and flexible. [0004] Second, on the Iub port, a public media access control (MAC) stream is newly defined in the CELL_FACH state. Different from the MAC-d flow of each user in the CELL_DCH state, the public MAC flow under the CELL_FACH is share...

AI Technical Summary

Problems solved by technology

According to this calculation formula, when the average transmission rate of the air interface is small, it is easy for the requested credit to be 0, which leads to a further decrease in the average transmission rate of the air interface. The queue buffer is also 0, and the service transmission is suspended. This phenomenon is called the "starvation" phenomenon of the flow control scheme.

[0015] In the scheduling scheme, the connection state of the radio resource control protocol (RRC) is not distinguished, that is, users in the CELL_FACH and CELL_DCH states use the same scheduling scheme, that is, the scheduling scheme in the CELL_FACH state does not target the public PQ queue Instead, the user's PQ queue is used as the object for scheduling, and the object of the flow control scheme in the CELL_DCH state is the public PQ queue. Due to the inconsistency between the objects of the flow control scheme and the scheduling scheme, it has a negative impact: some of the public PQ queues User buffers are rarely lower than their respective lower limits, while other users’ buffers are higher than their respective upper limits. Users with good channel conditions often have insufficient buffers, which inhibits throughput. Users with poor channel conditions often have more buffers, which will lead to additional emergency scheduling. , thus becoming a bottleneck limiting the system throughput

[0016] In summary, the prior art method for controlling the flow of the Iub port in the CELL_DCH state cannot be directly applied to the CELL_FACH state, and currently there is no complete solution for the flow control of the Iub port in the CELL_FACH state

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