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TECHNICAL REPORT
Universal Mobile Telecommunications System (UMTS);
1.28 Mcps TDD Home NodeB Radio Frequency (RF)
(3GPP TR 25.968 version 15.0.0 Release 15)
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3GPP TR 25.968 version 15.0.0 Release 15 1 ETSI TR 125 968 V15.0.0 (2018-07)
Reference
RTR/TSGR-0425968vf00
Keywords
UMTS
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3GPP TR 25.968 version 15.0.0 Release 15 2 ETSI TR 125 968 V15.0.0 (2018-07)
Intellectual Property Rights
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Foreword
This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
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Modal verbs terminology
In the present document "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be
interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions, symbols and abbreviations . 5
3.1 Definitions . 5
3.2 Symbols . 5
3.3 Abbreviations . 5
4 General . 5
4.1 Task description . 6
5 Radio scenarios . 6
5.1 Deployment configurations . 6
5.2 Interference scenarios . 6
6 HNB class definition . 6
6.1 Changes in 3GPP TS 25.105 . 6
6.1.1 Changes on transmitter characteristics . 6
6.1.1.1 Maximum Home NodeB output power . 6
6.1.1.2 Frequency Accuracy. 7
6.1.1.3 summary of transmitter change . 7
6.1.2 Changes on receiver characteristics . 7
6.1.2.1 Sensitivity. 7
6.1.2.2 Dynamic range . 7
6.1.2.3 Adjacent channel selectivity (ACS) . 8
6.1.2.4 Blocking characteristics . 8
6.1.2.5 Intermodulation characteristics . 8
6.1.2.6 summary of receiver change . 8
6.1.3 Changes on demodulation characteristics . 8
6.2 Changes in 3GPP TS 25.142 . 9
6.2.1 Changes on transmitter characteristics . 9
6.2.2 Changes on receiver characteristics . 9
6.2.3 Changes on demodulation characteristics . 9
7 Guidance on how to control HNB interference . 9
7.1 HNB measurements . 9
7.2 Control of output power of Home NodeB . 10
7.3 AGC of Home NodeB . 12
7.4 HNB Self Configuration . 13
7.4.1 Carrier selection or reselection: . 13
7.4.2 Automatic neighbouring cells configuration:. 13
7.5 Synchronization . 14
7.5.1 Initial synchronization . 14
7.5.2 Periodic synchronization . 15
8 Interference tests . 15
8.1 Adjacent channel deployment . 15
8.2 Co-channel deployment . 16
Annex A: Change history . 17
History . 18
ETSI
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3GPP TR 25.968 version 15.0.0 Release 15 4 ETSI TR 125 968 V15.0.0 (2018-07)
Foreword
rd
This Technical Report has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
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3GPP TR 25.968 version 15.0.0 Release 15 5 ETSI TR 125 968 V15.0.0 (2018-07)
1 Scope
This document is a technical report which was requested in the Objective of the RAN4 work item description
“1.28Mcps TDD Home NodeB RF requirements” [1]. The goal of this technical report is to describe the agreed
approach towards the RF related issues raised in [1]:
A) The existing 1.28Mcps BS classes did not fully address the RF requirements of the Home NodeB application.
Proposals for changes to radio performance requirement specifications TS 25.105 are therefore provided in this
report, together with the proposals for the test specification TS 25.142.
B) The report intends to provide guidance to mitigate interference and clarify some interference cases
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] R4-091435, “WI on 1.28Mcps TDD Home NodeB RF Requirements”, 3GPP RAN WG#46 Sanya
China Dec.2009 TD Tech, CMCC, CATT, Picochip Designs, ZTE
[2] R4-091232, “25.866 TR on 1.28Mcps TDD Home NodeB ”, 3GPP RAN WG#46 Sanya China
Dec.2009 TD Tech
3 Definitions, symbols and abbreviations
For the purposes of the present document, the terms and definitions given in TR 21.905 [54] and the following apply. A
term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [54].
3.1 Definitions
3.2 Symbols
3.3 Abbreviations
DL Downlink, the RF path from BS to UE
UL Uplink, the RF path from UE to BS
4 General
As agreed in the work item proposal [1]:
An increasing need for 1.28Mcps TDD Home NodeBs is observed to provide attractive services and data rates in home
environments in China as a consequence of a large number of TD-SCDMA subscribers within recent years.
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Whereas UTRAN is not optimally suited for this application, as it was developed and defined under the assumption of
coordinated network deployment. Actually home NodeBs are typically associated with uncoordinated and large scale
deployment.
Aim of this work item is to amend the 1.28Mcps TDD Home NodeB related RF specifications as suggested in the
RAN4 specific part of TR 25.866 to support the Home NodeBs application. No changes to the UE RF specifications
are foreseen.
4.1 Task description
TR 25.866 suggests that the existing 1.28Mcps TDD Base Station classes do not fully address the RF requirements of
the Home NodeB application. TR 25.866 summarises the areas where changes to TS 25.105 are expected to transmitter
characteristics, receiver characteristics and performance respectively. And guidance to mitigate interference and
interference test are needed to be investigated. Correspondingly, there are 2 objects in this WI,
- To update the RF requirement specification TS 25.105 as suggested by TR 25.866.
- Guidance to mitigate interference and interference test are need clarification.
5 Radio scenarios
5.1 Deployment configurations
5.2 Interference scenarios
6 HNB class definition
6.1 Changes in 3GPP TS 25.105
This section describes the changes to BS RF requirements specifications TS 25.105
6.1.1 Changes on transmitter characteristics
6.1.1.1 Maximum Home NodeB output power
Maximum output power, Pmax, of the base station is the mean power level per carrier of the base station measured at
the antenna connector in a specified reference condition. The period of measurement shall be a transmit timeslot
excluding the guard period. Considering interference of Home NodeB, it is suggested that Home NodeB output power
should be controlled. According to TR25.866, Considering two common Home NodeB scenarios(Home and small-scale
corporation), the following two Max. output power level are recommended in Table 6.1.1.1-1.
Table 6.1.1.1-1: Recommended power of Home NodeB
Power class Max. output Power Scenario
1 20 mW (13dBm) Home
2 100 mW(20dBm) Small-scale Corporation
Correspondingly, the rated output power, PRAT, of the Home NodeB is suggested to be specified in the TS 25.105.
In summary, two types of Home NodeB should be defined in specifications, that is,
- type 1: the output power of the Home NodeB is limited to 20 dBm
- type 2: the output power of the Home NodeB is limited to 13 dBm
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A minimum requirements was also introduced: In normal conditions, the Base station maximum output power shall
remain within +2 dB and -2dB of the manufacturer's rated output power. In extreme conditions, the Base station
maximum output power shall remain within +2.5 dB and -2.5dB of the manufacturer's rated output power. In certain
regions, the minimum requirement for normal conditions may apply also for some conditions outside the range of
conditions defined as normal.
6.1.1.2 Frequency Accuracy
Considering Home NodeBs are usually deployed at home and office, it is most likely that the serving UEs are in slow
mobility profile and a consensus was reached that the Home NodeB is expected to support UE speeds up to 30km/h
speed during the 1.28Mcps TDD Home NodeB SI.
According to 25.866 simulation results, the Home NodeB modulated carrier frequency can be relaxed to 0.25 PPM.
6.1.1.3 summary of transmitter change
The changes on transmitter characteristics in TS 25.105 are summarised in the following table.
Table 6.1.1.3-1: Changes on transmitter characteristics to TS 25.105
Section Requirement Discussion / Required Changes
4.2 Base station classes Add a new BS class – Home NodeB. Home NodeBs are characterized by
requirements derived from Femto Cell scenarios.
6.2.1 Base station maximum Two types of Home NodeB should be defined in specifications, that is,
output power
type 1: the output power of the HNB is limited to 20 dBm
type 2: the output power of the HNB is limited to 13 dBm
6.3 Frequency error Added frequency error requirement for Home BS
It was agreed on a minimum frequency error of 0.25ppm
6.1.2 Changes on receiver characteristics
6.1.2.1 Sensitivity
According to 3GPP TR25.866, using the reference measurement channel specified in 25.105 Annex A, the reference
sensitivity level and performance of the BS shall be as specified in Table 6.1.2.1-1.
Table 6.1.2.1-1: 1.28Mcps TDD Home NodeB reference sensitivity level
BS Class Reference BS reference sensitivity BER
measurement level
channel data rate
1.28Mcps TDD 12.2 kbps -101 dBm BER shall not exceed 0.001
Home NodeB
6.1.2.2 Dynamic range
Receiver dynamic range is the receiver ability to handle a rise of interference in the reception frequency channel. The
receiver shall fulfil a specified BER requirement for a specified sensitivity degradation of the wanted signal in the
presence of an interfering AWGN signal in the same reception frequency channel.
Considering impact of co-channel uplink interference on the Home NodeB, it is possible that Home NodeB receiver
will be exposed to strong interference signals from un-coordinated UEs. It was shown that the FDD Home NodeB
dynamic range requirement needs to be extended by 20dB to protect the HNB from the strong interference signal of an
un-coordinated UE. This conclusion can be reused in 1.28Mcps TDD Home NodeB.
The BER shall not exceed 0.001 for the parameters specified in Table 6.1.2.2-1.
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Table 6.1.2.2-1: Dynamic Range of 1.28Mcps TDD Home NodeB Receiver
Parameter Level Unit
Reference measurement 12.2 kbps
channel data rate
Wanted signal mean power -51 dBm
Interfering AWGN signal -47 dBm/1.28 MHz
6.1.2.3 Adjacent channel selectivity (ACS)
Adjacent channel selectivity (ACS) is defined as a measure of the receiver ability to receive a wanted signal at its
assigned channel frequency in the presence of a single code CDMA modulated adjacent channel signal at a given
frequency offset from the center frequency of the assigned channel. ACS is the ratio of the receiver filter attenuation on
the assigned channel frequency to the receiver filter attenuation on the adjacent channel(s).
The BER shall not exceed 0.001 for the parameters specified in Table 6.1.2.3-1.
Table 6.1.2.3-1: Adjacent channel selectivity of 1.28Mcps TDD Home NodeB Receiver
Parameter Level Unit
Reference measurement 12.2 kbps
channel data rate
Wanted signal mean power -77 dBm
Interfering AWGN signal -28 dBm
6.1.2.4 Blocking characteristics
Blocking requirement of Home NodeB is same as Local Area BS.
6.1.2.5 Intermodulation characteristics
Intermodulation requirement of Home NodeB is same as Local Area BS.
6.1.2.6 summary of receiver change
The changes on receiver characteristics in TS 25.105 are summarised in the following table.
Table 6.1.2.6-1: Changes on receiver characteristics in TS 25.105
Section Requirement Discussion / Required Changes
7.2 Reference sensitivity Added requirement for Home NodeB.
level
7.3 Dynamic range Added minimum requirement for Home NodeB.
7.4 ACS Added minimum requirement for Home NodeB.
7.5 Blocking characteristics Added minimum requirements for Home NodeB.
7.6 Intermodulation Added minimum requirements for Home NodeB.
characteristics
6.1.3 Changes on demodulation characteristics
To Multi-path Fading environment shown in Table B.2 of 25.105, case 1 is recommended for 1.28Mcps TDD Home
NodeB demodulation.
To Propagation Conditions for Multipath Fading Environments for E-DCH Performance Requirements for 1,28 Mcps
TDD shown in Table B.2A of 25.105 , ITU Pedestrian A speed 3km/h (PA3) ，ITU Pedestrian B speed 3km/h (PB3)
and ITU vehicular A speed 30km/h (VA30) are suitable to 1.28Mcps TDD Home NodeB.
To Parameters in static propagation conditions and multipath Case 1 channel, Ioc will be changed according to
sensitivity of Home NodeB.
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6.2 Changes in 3GPP TS 25.142
This section describes the considered changes to base station conformance testing.
6.2.1 Changes on transmitter characteristics
The changes on transmitter characteristics in TS 25.142 are summarised in the following tables. Requirements which
are not shown are applicable to Home NodeB without any modifications from the existing specifications.
Table 6.2.1-1: Changes on transmitter characteristics to TS 25.142
Section Requirement Discussion / Required Changes
6.2 Base station maximum Two types of Home NodeB should be defined in specifications, that is,
output power
type 1: the output power of the HNB is limited to 20 dBm
type 2: the output power of the HNB is limited to 13 dBm
6.3 Frequency stability Added frequency stability requirement for Home NodeB
It was agreed on a minimum frequency error of 0.25ppm
6.2.2 Changes on receiver characteristics
The changes on receiver characteristics in TS 25.142 are summarised in the following table.
Table 6.2.2-1: Changes on receiver characteristics in TS 25.142
Section Requirement Discussion / Required Changes
7.2 Reference sensitivity Added requirement for Home NodeB.
level
7.3 Dynamic range Added minimum requirement for Home NodeB.
7.4 ACS Added minimum requirement for Home NodeB.
7.5 Blocking characteristics Added minimum requirements for Home NodeB.
7.6 Intermodulation Added minimum requirements for Home NodeB.
characteristics
6.2.3 Changes on demodulation characteristics
To Multi-path Fading environment shown in Table B.2 of 25.142, case 1 is recommended for 1.28Mcps TDD Home
NodeB demodulation.
To Propagation Conditions for Multipath Fading Environments for E-DCH Performance Requirements for 1,28 Mcps
TDD shown in Table B.2A of 25.142 , ITU Pedestrian A speed 3km/h (PA3) ，ITU Pedestrian B speed 3km/h (PB3)
and ITU vehicular A speed 30km/h (VA30) are suitable to 1.28Mcps TDD Home NodeB.
To Parameters in static propagation conditions and multipath Case 1 channel, Ioc will be changed according to
sensitivity of Home NodeB.
7 Guidance on how to control HNB interference
7.1 HNB measurements
The HNB and its HUE can perform some measurements from the surrounding HNB, Macro UE, HUE and Macro
NodeB (MNB) such that HNB can apply some algorithms to perform interference mitigation and maintain the HNB
coverage. The potential measurements collected by HNB can be through the Connected Mode UEs attached to the HNB
during normal operation mode or via a DL Receiver function within the HNB itself in self-configuration mode. Such
DL receiver function is also called Network Listen Mode (NLM) or “HNB Sniffer”. The following measurements can
be performed by the HNB and its attached HUE and utilized for interference mitigation.
1) P-CCPCH RSCP:
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- HNB can inform its DL Receiver HUE perform the PCCPCH RSCP measurement of the neighbouring cells
including the Macro NodeB and HNB and report it to the HNB. Based on the measurement, the HNB can
estimate the DL interference from neighbouring cell to the HUE, further HNB can control the transmit power
of HUE such that the HUE’s UL interference to other cells (HNB and Macros) at a reasonable level.
- In “Sniffer mode”, HNB itself can also perform the P-CCPCH RSCP of the neighbouring cells including the
Macro NodeB and HNB and can estimate the DL interference towards the HUE. Base on the measurement,
HNB can control the HUE transmit power such that the HUE UL interference to other cells (HNB and
Macros) at a reasonable level.
- As the 1.28Mcps TDD system usually operate in multiple carrier, the measurements of the PCCPCH RSCP
and UTRA RSSI can help the HNB choose the proper carrier with less interference to reside on or estimate
the potential interference from the neighboring cell to the HUE, such that it can perform the power control or
shift to another carrier to avoid the interference.
2) ISCP:
- HNB can perform the ISCP measurement in a specified time slot in uplink and thus it can estimate the
interference from neighbouring cell in both UL and DL. If the ISCP measurement value is larger than a pre-
defined threshold (where an interfering MUE is close to HNB), which would mean the MUE’s Tx power
cause significant interference towards the HNB, HNB can choose to shift to work in another carrier to avoid
the strong UL interference or communicate with the interfering cell to coordinate the interference.
-HNB can inform the HUE perform the ISCP and report the ISCP measurement in DL. Judging from the
report, HNB can estimate the interference level such that it can perform transmit power control or coordinate
the HUE to another timeslot or carrier to avoid the interference.
3) Midamble Strength of Neighbouring Cells:
- By self-configuration, HNB can have the neighbouring cell list and the midamble sequences used by the
neighbouring cells. When HNB experiences the strong interference in UL, it can find the potential interfering
cell by estimating the Midamble strength of the potential cells for the neighbouring list such that HNB can
avoid the strong interference by shifting to another carrier or scheduling HUE to another UL time slot.
- As 1.28Mcps TDD system operate in multiple carriers, usually only the primary carrier have the P-CCPCH,
when HUE experience some strong interference from the secondary carrier of some neighbouring cells in
DL, HUE can estimate the interference strength by estimating the midamble strength of the potential
neighbouring cells an
...