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Frequency quality criteria for inter-frequency handover in a TD-CDMA communication system

Inactive Publication Date: 2006-01-19
YUAN ZHU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0010] In accord with the invention, the decision metric related to capacity may vary in inverse proportion to the difference between a received signal strength indicator for a cell and a carrier frequency and the received signal code power for the cell and the carrier frequency, or in inverse proportion to quantities algebraically related so as to behave in a similar way.
[0011] Also in acc

Problems solved by technology

However, for inter-frequency handover cell quality criteria, selecting a cell having the best P-CCPCH RSCP is not always the best choice since a good P-CCPCH RSCP does not necessarily indicate low interference at slot 0 compared with other cells.

Method used

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  • Frequency quality criteria for inter-frequency handover in a TD-CDMA communication system
  • Frequency quality criteria for inter-frequency handover in a TD-CDMA communication system
  • Frequency quality criteria for inter-frequency handover in a TD-CDMA communication system

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Embodiment Construction

[0023] According to the invention, the IFHO algorithm for TD-SCDMA is modified so as to include a frequency criteria or metric for two different causes of IFHO: one for coverage-caused link deterioration (i.e. for the case that a UE moves outside of the coverage area of a SAP) and the other for over-capacity. For coverage-caused IFHO, the IFHO metric can be the same as in the prior art, namely:

M(IFHO-coverage)=PRSC,   (1)

where PRSC is P-CCPCH RSCP (for a particular cell i, not made express in the above, and for a particular frequency j, also not made express), i.e. the received signal code power for P-CCPCH (for a cell i). For over-capacity, the IFHO metric can be:

M(IFHO-capacity)=PRSC / (IRSS−PRSC),   (2)

(again for a particular cell i, not made express, and for a particular frequency j, also not made express) where IRSS=UTRA Carrier RSSI (Received Signal Strength Indicator), which is used here to indicate the wideband power of slot 0. Other metrics for the IFHO capacity metric ...

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Abstract

A method for determining whether to perform IFHO (inter-frequency handover) of a UF apparatus from one cell to another and from one carrier frequency to another in a TD-CDMA telecommunications network (including e.g. a TD-SCDMA network)—based separately on coverage and capacity, using one decision metric for coverage (e.g. based on received signal code power for each candidate cell and each candidate carrier frequency) and a different decision metric for capacity (e.g. based on a quantity proportional to the received signal code power and inversely proportional to the difference between a received signal strength indicator and the received signal code power). Corresponding equipment and a computer program product is also provided. In deciding whether IFHO is needed based on capacity, a threshold for received signal code power may be used in addition to the metric for capacity.

Description

TECHNICAL FIELD [0001] The present invention pertains to the field of wireless communication. More particularly, the present invention pertains to criteria used in inter-frequency handover in a cellular communication system. BACKGROUND ART [0002] TD-SCDMA (Time Division-Synchronized Code Division Multiple Access), also known as UTRA (Universal mobile telecommunications system (UMTS) Terrestrial Radio Access) TDD (time division duplex) 1.28 Mcps option, is a so-called 3G (third generation) wireless communication system that is supposed to be used for example in China, possibly along with two other 3G technologies—UTRA FDD version of WCDMA (Wideband CDMA) and CDMA2000. [0003] TD-SCDMA uses both TDMA (Time Division Multiple Access) and CDMA as multiple access methods, which means there are several possible slots for each transmitting direction on a single carrier, and in each slot one or more users, separated by orthogonal codes, can transmit or receive data simultaneously, one user ca...

Claims

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Application Information

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IPC IPC(8): H04Q7/20H04B1/707H04J13/00H04W36/14H04W36/22
CPCH04W36/22H04W36/14H04W36/302H04B7/2618H04W36/0061
Inventor YUAN, ZHU
Owner YUAN ZHU
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