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RLC data transmission method of HSDPA system

A data transmission method and data technology, applied in the field of RLC data transmission, can solve the problems of limited PQ, limited data, limited service source, etc., and achieve the effect of avoiding the emptying of PQ

Active Publication Date: 2010-12-29
TD TECH COMM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first case is Iub rate limited
The so-called Iub rate limitation means that due to the Iub transmission bandwidth limitation, the flow control algorithm is used to limit the allocated credits, which will cause the data to be limited by the Iub bandwidth, so that it cannot be sent to the PQ in time, which will lead to emptying
[0005] The second case is PQ limited
[0006] The third case is that the business source is limited
However, the situation of limited service sources cannot be improved through flow control algorithms and configuration optimization on the NodeB side. At present, there is no suitable way to avoid PQ emptying caused by limited service sources.

Method used

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  • RLC data transmission method of HSDPA system
  • RLC data transmission method of HSDPA system

Examples

Experimental program
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Embodiment 1

[0035] In this embodiment, the RLC sending interval is kept and credits are accumulated throughout the process. This approach is mainly aimed at the sudden business situation with limited service sources described in the background technology, and it will also improve the sudden business situation.

[0036]For the business with strong suddenness, it is usually because the data volume of the business arrives at the RLC buffer at the time of Iub transmission is quite different, which causes the PQ to be empty, so there is no need to adjust the transmission interval of the RLC buffer. Thus, specific RLC data transmission includes:

[0037] Use the FP_interval given in NodeB capacity_allocation as the interval for RLC buffer transmission, that is, keep the same time interval as the existing method for RLC buffer transmission.

[0038] Credits are accumulated during all RLC buffer transfers. Specifically, after each RLC buffer transmission, the difference between the allocated cr...

Embodiment 2

[0045] In this embodiment, the transmission interval of the RLC buffer is shortened, and credits are accumulated throughout the whole process or credits are accumulated at intervals. This approach is mainly aimed at the sudden business situation with limited business sources described in the background technology, and it will also improve the business situation with strong suddenness.

[0046] For bursty services, it is usually because the service enters the RLC buffer at the interval between the two transmissions of the RLC buffer, resulting in PQ emptying. Therefore, the transmission interval of the RLC buffer can be shortened to ensure that the service enters the RLC buffer as soon as possible and transmits data in time. . Thus, specific RLC data transmission includes:

[0047] The easiest way to use a shortened fixed interval for RLC buffer transmission is to adjust the RLC buffer transmission interval to FP_interval / M, where M is an integer greater than 1, such as M=2, t...

Embodiment 3

[0053] In this embodiment, the transmission interval of the RLC buffer can be adjusted adaptively, and credits are accumulated throughout the process. The specific RLC data transmission includes:

[0054] RLC buffer transmission does not have a fixed sending interval, but adaptively and dynamically adjusts the sending time. Specifically, a sending threshold is set in advance, and when the amount of data in the RLC buffer reaches the sending threshold, RLC buffer transmission is performed, and credit accumulation in one or more FP_intervals before the current moment is considered.

[0055] The specific way of accumulating credits is the same as that in Embodiment 1, and will not be repeated here.

[0056] Applying the method of this embodiment, since the accumulation of credits is also used, when the amount of data in the RLC buffer is large, more data can be sent to the PQ, thereby avoiding emptying of the PQ. Moreover, since the transmission interval of the RLC buffer can b...

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Abstract

The invention discloses an RLC data transmission method of an HSDPA system, which comprises the following steps: calculating the difference between credits which are distributed to current RLC transmission and the actually sent credits after finishing each RLC buffer transmission, and carrying out accumulation on the difference obtained by calculation at each time within a preset time interval; and judging whether the data size in an RLC buffer is larger than the credits distributed at this time or not during each RLC buffer transmission, if so, indicating that the data size to be sent at this time is larger but the distributed credits are limited and considering the application of the accumulated credits before for carrying out the current data transmission; otherwise, indicating that the data size to be sent is still small, and sending out all data in the RLC buffer. Furthermore, the value of the accumulated credits is adjusted according to the credits distributed to the next RLC buffer transmission after each RLC buffer transmission. The application of the RLC data transmission method can avoid emptying a PQ due to business source limitation.

Description

technical field [0001] The invention relates to flow control technology, in particular to an RLC data transmission method of an HSDPA system. Background technique [0002] In the HSDPA system, multiple users share the HS-DSCH transmission channel. Therefore, the air interface rate is affected by channel conditions, scheduling algorithms, service source characteristics, and the number of users in the cell. Therefore, the NodeB side needs to cache the data in the MAC-hs buffer (hereinafter referred to as PQ). In order to avoid the situation of PQ overflow and the situation where PQ is empty and the RLC buffer still has data (called stalling or emptying), a flow control algorithm is introduced to control the rate of the iub port. [0003] For the situation of PQ overflow, it can be avoided as long as the PQ size and the threshold for triggering iub rate reduction are set reasonably. For the case of emptying, the avoidance method is relatively complicated, and different flow c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/10H04W28/14
Inventor 雷春娟
Owner TD TECH COMM TECH LTD