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Method and apparatus for automatic request repeat of sending and receiving

A technology of retransmission and transmitter, applied in cellular system, universal mobile telecommunication system UMTS. , the field of hybrid ARQ type II and III solutions, can solve the problems of large signal overhead, obstruction, asynchronous transmission increasing uplink interference, etc.

Inactive Publication Date: 2003-03-12
INVT SPE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of these bits, asynchronous transfers can improve throughput and latency performance and system flexibility, but incur large signaling overhead
Due to the limitation on the number of bits on the feedback channel prevents the use of good FEC coding for multiple bits of the SN
Also, this asynchronous transmission increases interference on the uplink and other UE feedback channels
Thus, asynchronous transmission increases power consumption and requires more complex user equipment
Therefore, asynchronous timing cannot provide a complete solution to the problem of synchronous feedback channels

Method used

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  • Method and apparatus for automatic request repeat of sending and receiving
  • Method and apparatus for automatic request repeat of sending and receiving
  • Method and apparatus for automatic request repeat of sending and receiving

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Embodiment Construction

[0052] now refer to Figure 4a , the transmitter according to the preferred embodiment of the present invention includes most of the already referenced Figure 1a unit discussed. in addition, Figure 4a The transmitter of the present invention includes a controller 410 for monitoring the time interval for which ACK / NAK messages have been received and for controlling retransmissions in response to evaluation of the ACK / NAK signal. How to control will be described in detail below.

[0053] According to the invention, data packets are sent from a sender to a receiver during a first predetermined time interval. An acknowledgment message is sent from the receiver to the sender on the feedback channel during a second predetermined time interval. In the following description, the first time interval is called the transmission time interval (TTI), because the length of the second time interval is preferably shorter than the length of the TTI time interval, and the second time inter...

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Abstract

The invention provides an ARQ scheme where data packets are transmitted from the transmitter to the receiver in first predetermined time intervals, and positive (ACK) and negative (NAK) acknowledgement messages are transmitted from the receiver to the transmitter in second predetermined time intervals. For each data packet that has been transmitted from the transmitter to the receiver, at least two second time intervals can be used for transmitting the acknowledgement message. The invention therefore improves over synchronous feedback transmission schemes by adding flexibility without incorporating the drawback of asynchronous transmission schemes that are known to have a high signalling overhead. The invention is preferably applicable to UMTS and HSDPA systems but can also be applied in any other communications system. The feedback channel may be uplink or downlink.

Description

technical field [0001] The present invention relates to ARQ data transmission and reception technology, and in particular, the present invention relates to hybrid ARQ type II and III schemes. The present invention can be applied to mobile communication systems, especially cellular systems. In particular, the invention can be used in the Universal Mobile Telecommunications System UMTS. Background technique [0002] In conventional data communication systems, error detection for non-real-time services is usually based on an Automatic Repeat Request (ARQ) scheme combined with Forward Error Correction (FEC). The combination of ARQ and FEC techniques is often referred to as Hybrid ARQ (HARQ). [0003] FEC introduces redundancy into blocks of information bits of a given length to form encoded blocks of different lengths prior to transmission. Redundancy helps combat errors at the receiver. If the cyclic redundancy check (CRC) detects an error, the receiver requests the transmi...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04L1/16H04L1/18H04W28/00H04W28/04
CPCH04L1/1819H04L1/16H04L1/1854H04L1/1874H04L1/1845H04B7/2643H04L1/1614H04L1/18
Inventor 铃木秀俊艾科·塞德尔
Owner INVT SPE LLC