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Implementing downlink code management for fractional dpch in timing conflict situations

A technology of code and code sharing, which is applied in the field of optimization of downlink code usage, and can solve problems such as unresolved soft handover

Inactive Publication Date: 2008-05-21
NOKIA NETWORKS OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since F-DPCH is a new feature, there is currently no solution for the Soft Handover (SHO) problem

Method used

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  • Implementing downlink code management for fractional dpch in timing conflict situations
  • Implementing downlink code management for fractional dpch in timing conflict situations
  • Implementing downlink code management for fractional dpch in timing conflict situations

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Embodiment Construction

[0018] 3GPP networks use Soft Handover (SHO) to improve their coverage and cell edge performance. In SHO, multiple radio links from different base stations are received in parallel in the UE. Since the combining logic in the UE is limited in complexity, all radio links must fall within a common UE receive window of 148 chips in increments or decrements. If one of the radio links drifts out of the receive window (eg when the UE is moving), the UE asks the network to adjust the transmission timing by increments or decrements of 256 chips.

[0019] For the combination of F-DPCH and soft handover, this has the following consequences. First, there may be no radio link timing adjustment for a single UE because adjacent downlink transmission time instants are blocked by other UEs on the same shared code. Second, shared F-DPCH transmissions from different cells to a single UE cannot be adjusted to fit within the + / - 148 chip receive window of the UE since there may be no adjustment....

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Abstract

A method, apparatus, system, network element and and software product are presented for enabling a user equipment to efficiently use downlink codes during soft handover. The user equipment receives radio links in parallel from different base stations. In a code-optimized version, the code of at least one of the radio links is shared with at least one other user terminal during the soft handover. However, exclusive codes are employed for the other radio links to the user equipment. In a network-management-optimized version, exclusive codes are employed for all radio links to the user equipment. In this way, drifting radio links during soft handover can be kept within the receiver window of the user equipment.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application 60 / 677,092, filed May 2, 2005. technical field [0003] The present invention relates generally to wireless communications and more particularly to optimization of downlink code usage. Background technique [0004] The 3rd Generation Partnership Project (3GPP) Release 6 has introduced a new feature for optimizing downlink code usage, called Fractional Dedicated Physical Channel (F-DPCH). With this scheme, multiple user equipments (UEs) share a single downlink code in time. The present invention solves the problems caused by F-PDCH (ie multiple parallel radio links) combined with soft handover. [0005] Code sharing (time division multiplexing) for F-DPCH causes a problem of timing adjustment in soft handover. In the soft handover state there are multiple radio links with only loose synchronization, which may drift independently of each other especially ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04B7/005H04W36/18
CPCH04B7/022H04J13/00H04J13/16H04W36/18H04B2201/70702
Inventor V·斯托德勒
Owner NOKIA NETWORKS OY