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ACK/NACK detection in wireless communication

A negative confirmation and radio signal technology, applied in the field of confirmation/negative confirmation detection, can solve the problem of large discontinuous transmission

Inactive Publication Date: 2008-02-13
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DTX can also occur in the case of a single link, but the possibility of discontinuous transmission is greater in the case of soft handover

Method used

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  • ACK/NACK detection in wireless communication
  • ACK/NACK detection in wireless communication
  • ACK/NACK detection in wireless communication

Examples

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Embodiment Construction

[0017] As described above, embodiments of the present invention provide systems and methods for improving ACK / NACK signal detection in mobile terminals. Figure 1 illustrates a portion of an exemplary wireless communication system 100 according to an embodiment of the invention. Wireless communication system 100 includes mobile terminals and several WCDMA base stations, four of which are indicated here at 104, 106, 108 and 110. When the mobile terminal 102 is at location A, it may only receive signals from the first base station 104 and thus connect to that base station 104 . However, when the mobile terminal moves to location B, it may receive signals from several other base stations, including base stations 106, 108, and 110. The mobile terminal 102 must then determine which of the base stations 104, 106, 108 and 110 has the strongest signal and handoff to that base station. Such a procedure is commonly referred to as soft handover, and represents a situation in which mobil...

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Abstract

Improved ACK / NACK detection in a mobile terminal of a wireless communication system is disclosed. The ACK / NACK detection uses knowledge about the power of the acknowledgment / negative acknowledgment signal along with the probability that a DTX will occur to increase the probability that the ACK signal will be correctly detected. The probability that a DTX will occur is determined by observing the transmit power commands issued to the mobile terminal. A high number of power up commands relative to power down commands may indicate a poor quality uplink meaning that a DTX is likely to occur.

Description

technical field [0001] The present invention relates generally to modern wireless communication systems, and more particularly to improving acknowledgment / negative acknowledgment (ACK / NACK) detection in transmissions in such wireless communication systems. Background technique [0002] In wireless communication systems, ACK and NACK signals are used to indicate whether a transmitted data packet has been correctly received. If so, the receiving unit sends an ACK signal to the transmitting unit in order to transmit the new data block. If not, the receiving unit sends a NACK signal to the transmitting unit to retransmit the previous data block. In general, it is more important to correctly detect a NACK signal than an ACK signal, because the failure to detect a NACK signal may cause an error, while the failure to detect an ACK signal just results in retransmission. However, retransmissions may cause delays on the air interface, and typically only a certain number of retransmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16
CPCH04L1/1692H04L2001/125H04W76/28H04L5/0055H04W52/04
Inventor B·麟多夫J·尼尔森P·马尔姆
Owner TELEFON AB LM ERICSSON (PUBL)
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