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Improvements in, or relating to, E-UTRAN and handover

A technology related to parameters and base stations, applied in electrical components, wireless communication, power management, etc., can solve the problems of uplink synchronization delay, increase RACH conflict, increase handover delay and interruption time, etc., to achieve low complexity and short interruption. effect of time

Inactive Publication Date: 2010-07-07
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such information is not exchanged between eNodeBs, in LTE uplink synchronization will be delayed
Secondly, it may also increase the conflict on RACH
Third, due to the increase in RACH load, interference will also increase
The obvious disadvantage is that this will increase the switching delay and interruption time
Another problem is that this will increase the complexity in the UE because reading neighbor cell information in RRC_CONNECTED mode

Method used

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  • Improvements in, or relating to, E-UTRAN and handover
  • Improvements in, or relating to, E-UTRAN and handover
  • Improvements in, or relating to, E-UTRAN and handover

Examples

Experimental program
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Embodiment Construction

[0027] A glossary of abbreviations used in this patent specification is listed below to facilitate understanding of the present invention.

[0028] E-UTRAN: Evolved UMTS Terrestrial Radio Access Network = LTE (Long Term Evolution)

[0029] OFDM: Orthogonal Frequency Division Modulation

[0030] OFDMA: Orthogonal Frequency Division Multiple Access

[0031] RS: reference signal

[0032] AGW: Access Gateway

[0033] eNode B: Enhanced Node B

[0034] RACH: random access channel

[0035] SC-FDMA: Single Carrier FDMA

[0036] UE: user equipment

[0037] SCH: synchronization signal

[0038] UE: user equipment

[0039] CPICH: Common Pilot Indicator Channel:

[0040] FDD: frequency division duplex

[0041] WCDMA: Wideband Code Division Multiple Access

[0042] figure 1 The architecture of a radio network in which the invention is implemented is shown in . An Access Gateway (aGW) is connected to several Enhanced Node Bs (eNode B). The interface between the aGW and the eNod...

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Abstract

The present invention relates to a method, a base station and an interface for handover in a wireless communication network. Handover is initiated when the signal quality falls below a predetermined value. Random access serves as an uplink procedure to enable the UE to make handover from a first base station (eNodeB) to a suitable second base station (eNodeB). In the present invention, random access parameters are exchanged between second and first base station before said first base station signals said random access parameters to said user equipment.

Description

technical field [0001] The invention relates to a method, a base station, an interface for handover in a wireless communication network, comprising at least a first base station (eNod B) and at least one user equipment, wherein the handover is initiated when the signal quality falls below a predetermined value, and wherein random access The input parameter is used as an uplink procedure to enable the handover of the UE to a suitable second base station (eNod B). Background technique [0002] When a mobile phone is moving, it will pass through different cells. If the mobile phone is not participating in a call, it will tell the network from time to time that it has moved to another cell. If the mobile phone is involved in a call, it is of course necessary to hold the call while the phone is moving. The process of replacing communication with one cellular radio station with another is called handover. When the cellular network sees that the mobile phone is getting closer to...

Claims

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Application Information

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IPC IPC(8): H04W36/30H04W74/08
CPCH04W36/0016H04W74/0866H04W52/40H04W36/30H04W36/0077H04W74/0833H04W36/302
Inventor M·卡兹米R·巴尔德梅尔
Owner TELEFON AB LM ERICSSON (PUBL)