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Method to check communication link reliability

A communication link and reliability technology, applied in the field of data communication, can solve problems such as unreliable feedback information and affecting performance

Inactive Publication Date: 2005-09-14
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the link imbalance is large enough, the serving base station may not be able to reliably receive feedback information for erased packets from the terminal
Performance is then severely impacted by failure to retransmit these erased packets

Method used

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  • Method to check communication link reliability
  • Method to check communication link reliability
  • Method to check communication link reliability

Examples

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Embodiment Construction

[0019] figure 1 is a schematic diagram of a wireless communication system 100 that can implement various aspects and embodiments of techniques for mitigating deleterious effects of link imbalances. System 100 includes a plurality of base stations that provide coverage for a particular geographic area. For brevity in figure 1 Only two base stations are shown in . A base station is also called a Node B, base transceiver system (BTS), access point or some other terminology. A base station and / or its coverage area is also often referred to as a cell, depending on the context in which the term is used. The base stations are part of the UMTS Radio Access Network (UTRAN).

[0020] Individual terminals 106 are generally distributed throughout the system. For brevity in figure 1 Only one terminal is shown. A terminal is also called user equipment (UE), mobile station, access terminal or some other terminology. Each terminal is capable of communicating with one or more base stat...

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Abstract

Techniques to mitigate the effects of link imbalance for the uplink between a terminal (or UE) and multiple base stations (or Node Bs). In one aspect, the serving base station (i.e., the one designated to transmit packet data to the terminal) monitors the uplink received SNR for each terminal designated to receive packet data transmission. The serving base station then determines, based on the uplink received SNR and an SNR threshold, whether or not link imbalance potentially exists for each such terminal. In another aspect, if it is determined that link imbalance potentially exists, then a 3-way handshake is performed to check the reliability of a feedback mechanism used for packet data transmission. Appropriate responsive actions may then be performed based on the result of the check.

Description

technical field [0001] The present invention relates generally to data communications, and more particularly to techniques for mitigating deleterious effects due to link imbalances in wireless communication systems, such as CDMA systems. Background technique [0002] Wireless communication systems are widely employed to provide various types of communications such as voice and data. These systems may be multiple-access systems capable of supporting communication with multiple users and may be based on Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), or some other multiple access technique. CDMA systems offer certain advantages over other types of systems, such as increased system capacity. [0003] To improve reliability, a terminal may communicate with multiple base stations simultaneously via a process commonly referred to as soft handover. Soft handover is generally supported for certain services (eg ...

Claims

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Application Information

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IPC IPC(8): H04B7/005H04B7/26H04L1/00H04L1/16H04L1/18H04L1/20H04L1/24H04L5/14H04W52/28
CPCH04L1/24H04L1/1671H04W52/286H04L1/0003H04L1/0015H04L1/0025H04L1/1845H04L5/1438H04L1/1812H04L1/22H04L25/0224H04W24/08
Inventor D·P·马兰迪A·H·瓦亚诺斯
Owner QUALCOMM INC
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