Methods and arrangements in a wireless communication system

A communication system and wireless network technology, which is applied in the field of uplink timing adjustment, can solve the problems that cannot be used for traditional UEs, and achieve the effect of avoiding periodic adjustment and minimizing signaling overhead

Active Publication Date: 2010-09-15
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even though signaling resources dedicated to timing adjustments are not needed from an interference perspective, they still exist
Another implementation-dependent pitfall is that if the timing adjustment command is implemented as a binary command, i.e. +/- 1 time step, it will be in one direction (+1 time st

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  • Methods and arrangements in a wireless communication system
  • Methods and arrangements in a wireless communication system
  • Methods and arrangements in a wireless communication system

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Embodiment Construction

[0025] Hereinafter, the present invention will be described in more detail with reference to specific embodiments and drawings. For purposes of explanation and not limitation, specific details are set forth, such as particular scenarios, techniques, etc., in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments that depart from these specific details.

[0026] Furthermore, those skilled in the art will understand that the functions and means explained herein below may be implemented using software functionality in conjunction with a programmed microprocessor or general purpose computer, and / or using application specific integrated circuits (ASICs). It should also be understood that although the invention has been described primarily in terms of methods and apparatus, the invention can also be implemented in computer program products and systems comprising a co...

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Abstract

The present invention relates to methods and arrangements that enable uplink timing adjustment in a UTRAN while minimizing the signalling overhead. This is achieved by a solution where the information about the estimated reception time is used by the NB to determine whether the UEs need to be time adjusted on the UL in order to avoid TTI overlapping and thus interference. The estimated reception time of a UE UL signal is compared with an ideal reception time (the reference time) which can be defined based on the overall knowledge of the estimated reception times. If the difference between the estimated and the ideal reception time is larger than a pre-defined threshold value, meaning that the overlapping with some other UEs TTI will be big, a timing adjustment is initiated.

Description

technical field [0001] The present invention relates to the field of wireless communications, and in particular to uplink timing adjustment in UMTS Terrestrial Radio Access Network (UTRAN). Background technique [0002] Universal Mobile Telecommunications System (UMTS) is one of the third generation mobile communication technologies designed to succeed GSM. The UMTS Terrestrial Radio Access Network (UTRAN) is the radio access network of the UMTS system. WCDMA technology has been chosen as the standard for UTRAN. In WCDMA architecture, such as figure 1 As shown, User Equipment (UE) 150 is wirelessly connected to NodeBs (NBs) 130a-c, which in turn are connected to Radio Network Controllers (RNCs) 100a-b. [0003] Such as Figure 2a As shown, RNC 210 is connected to NB 230, which in turn provides services to two UEs 251,252. In a WCDMA wireless network like this, the signals on the downlink (DL) dedicated channels of different UEs in a cell are 256 chip time aligned in ord...

Claims

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Application Information

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IPC IPC(8): H04B7/26
CPCH04W56/0045H04B7/2681
Inventor 约翰·伯格曼德尔克·杰斯坦伯格
Owner TELEFON AB LM ERICSSON (PUBL)
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