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Method and arrangement for timing diversity weight changes in cellular radio system

A radio, timing-mode technology that can be used in radio transmission systems, diversity/multi-antenna systems, synchronization devices, etc., to solve problems such as uncertain power control device errors

Inactive Publication Date: 2004-07-07
СИСВЕЛ ИНТЕРНЭШНЛ С.А.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While the UE may have a good estimate of the length of the current propagation delay, leaving the correct moment to implement the change partially undefined can lead to uncertainty and potentially serious errors in the power control apparatus

Method used

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  • Method and arrangement for timing diversity weight changes in cellular radio system
  • Method and arrangement for timing diversity weight changes in cellular radio system
  • Method and arrangement for timing diversity weight changes in cellular radio system

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Embodiment Construction

[0029] figure 2 Indicates the relative timing of uplink and downlink time slots on the base station and UE. Row 201 is a series of downlink transmission slots present at the base station, and row 202 is the same series of downlink transmission slots present at the UE. Row 203 is a string of uplink transmission slots present at the UE, and row 204 is the same string of uplink transmission slots present at the base station. The duration of each slot in uplink and downlink direction is called a slot and its length is 2560 chips. The slots are numbered and the synchronization between the uplink and downlink is determined such that from the moment the UE receives the start of a certain i-th downlink slot to the moment when the UE is in the corresponding i-th uplink slot The time to start transmission is 1024 slices.

[0030] figure 2 The exemplary slot structure shown in refers to the known DPCCH (Dedicated Physical Control Channel) in both downlink and uplink directions. The ...

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Abstract

A method and an arrangement are provided for timing a change of diversity weights in a radio connection between a base station and a terminal. A response timing mode is selected from a number of predefined response timing modes. The terminal is informed about the selected response timing mode. An initiation is received from the terminal and it is responded to said initiation by changing certain diversity weights so that the exact moment of time for effecting the change is determined by said selected response timing mode.

Description

technical field [0001] The present invention generally relates to the field of controlling transmission power and phase in a radio link between a base transceiver station and a mobile terminal. The invention relates in particular to timing factors related to the implementation of changes in transmission power and phase. Background technique [0002] Space diversity in cellular radio systems means that the communication link between a mobile terminal and a base transceiver station, the BTS, passes simultaneously through at least two antennas on the BTS. In order to take full advantage of space diversity in the downlink direction, the relative transmission power and phase directed through the different antennas must be carefully balanced. The relative transmit power levels and phases of the different antennas can be represented by certain complex weights (Weights) determined by a controller unit within the BTS or other fixed part of the network. [0003] Several downlink div...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H04B7/06H04B7/08H04B7/26
CPCH04B7/086H04B7/0634H04B7/0636H04B7/08H04W56/00
Inventor H·海基宁K·佩科宁E·马卡梅基
Owner СИСВЕЛ ИНТЕРНЭШНЛ С.А.