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Method for reducing retransmission delay time of HSUPA data

A data retransmission and data transmission technology, applied in the field of mobile communications, can solve problems such as large retransmission delay, RLC transmission window congestion, and large buffering requirements, so as to solve the problem of delay, reduce the pressure of data buffering, and reduce delay Effect

Inactive Publication Date: 2008-10-01
上海宇梦通信科技有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Because in the existing HSUPA data transmission, after the HARQ control of the MAC layer, there is no guarantee that after the data block loss occurs, the RLC layer will retransmit the AM PDUs, and the retransmission delay will be relatively large at this time. ; Due to the delay of the UTRAN (UMTS Terrestrial Radio Access Network) RLC layer feedback, to a certain extent, the UE (User Equipment) RLC transmission window will be blocked, resulting in the idleness of the MAC layer HARQ entity; due to the great increase in the transmission rate of HSUPA , for the same data retransmission delay, the UE's buffering requirements become larger, and reducing the delay is an effective way to reduce buffering pressure

Method used

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  • Method for reducing retransmission delay time of HSUPA data
  • Method for reducing retransmission delay time of HSUPA data
  • Method for reducing retransmission delay time of HSUPA data

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Embodiment 1

[0036] Assume that a data transmission starts at CFN (Initial Connection Frame Number)=0 time. EDCH TTI (Enhanced Dedicated Channel Transmission Time Interval) = 10ms, the maximum number of MAC retransmissions is 3 (that is, each piece of MAC data can be transmitted up to 4 times), assuming 4 MAC HARQ processes (Medium Access Control Hybrid Automatic Repeat Request process) Both can be used to transmit data from the same logical channel of RLC. In order to simplify the expression of RLC, it is set that each MAC and RLC only needs one RLC PDU, the SN number (serial number) is 1-7, and there is a Poll (query) bit on SN=7, and the RLC on the network side receives SN=7 Only this PDU will require UE RLC to retransmit.

[0037] In addition, in this embodiment, the RLC PDU received by the MAC on the network side is directly sent to the RLC, but in the actual system, reordering is required to send the PDU to the RLC, so although in Figure 4 It is not marked in , but the impact of r...

Embodiment 2

[0050] The basic assumption is consistent with Example 1. Such as Figure 5 Shown, the improved HSUPA data transmission process of the present invention is specifically as follows:

[0051] (1) In the first four RTTs (CFN0 to CFN15): the transmission process is the same as in Embodiment 1;

[0052] (2) At the fifth RTT (CFN16 to CFN19): After PROC 1 detects that the maximum number of retransmissions of the transport block fails, the MAC discards the data, and then reports to the RLC that SN=1 has not been successfully transmitted, and requests a new transmission data; at this time, RLC will consider the retransmission of SN=1 (for the sake of simple expression, the data is no longer split here, in actual conditions, according to the latest transmission capability of MAC, the possibility of sending the reselected data in the next RTT will increase ; and the retransmission of the MAC layer can not re-split the previous data), so that the PDU of SN=1 is sent in PROC 1; the same...

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Abstract

The invention discloses a method for reducing HSUPA data retransmission time-delay. The method provides data transmission report in MAC layer to UE RLC by employing UE MAC, assistant processes data retransmission of RLC AM entity. Under the pre-condition of no-changing network side, no-adding interface, the method provided by the invention starts data retransmission in RLC layer in advance through carrying little bit of information in prior interface in suitable time, reduces HSUPA data transmission time-delay, and reduces pressure of data cushion in UE side factually. The method is easy to realized, and has strong practicability.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to an effective method for reducing the retransmission delay of HSUPA data in the third generation mobile communication system WCDMA. Background technique [0002] High Speed ​​Uplink Packet Access (HSUPA) is an important enhancement to the third generation mobile communication system UMTS. Wideband code division multiple access WCDMA is one of the three wireless access technologies determined by ITU and 3GPP. [0003] In the existing HSUPA data transmission process, in order to improve the reliability of data transmission, a two-layer feedback retransmission scheme is adopted. Such as figure 1 As shown, in the MAC (Media Access Control) layer, the HARQ (Hybrid Automatic Repeat Request) of N-step stop (Stop-And-Wait) is used to retry the TB block (transport block) according to the feedback message from the receiving end. When the loss of data blocks that cannot be guaranteed a...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L1/18H04L1/00H04L1/16H04L12/28H04L29/10
Inventor 秦信江郑旸张浩谢鑫军石洁珂
Owner 上海宇梦通信科技有限公司
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