WO2008100188A1 - Channel measurements on combined pilot signala in multi- carrier systems - Google Patents
Channel measurements on combined pilot signala in multi- carrier systems Download PDFInfo
- Publication number
- WO2008100188A1 WO2008100188A1 PCT/SE2007/050089 SE2007050089W WO2008100188A1 WO 2008100188 A1 WO2008100188 A1 WO 2008100188A1 SE 2007050089 W SE2007050089 W SE 2007050089W WO 2008100188 A1 WO2008100188 A1 WO 2008100188A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- measurements
- pilot signal
- station according
- power
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
Definitions
- the present invention relates to a method and a device for carrying out measurements in a cellular radio systems having multiple carriers.
- Time Division-Synchronous Code Division Multiple Access TD-SCDMA uses Time division duplex TDD, in contrast to the frequency division duplex FDD scheme used by
- Wideband Code Division Multiple Access WCDMA systems By dynamically adjusting the number of timeslots used for downlink and uplink, the system can more easily accommodate asymmetric traffic with different data rate requirements on downlink and uplink than FDD schemes. Since it does not require paired spectrum for downlink and uplink, spectrum allocation flexibility is also increased. Also, using the same carrier frequency for uplink and downlink means that the channel condition is the same on both directions, and the base station can deduce the downlink channel information from uplink channel estimates, which is helpful to the application of beamforming techniques.
- TD-SCDMA also uses TDMA in addition to the CDMA used in WCDMA. This reduces the number of users in each timeslot, which reduces the implementation complexity of multiuser detection and beamforming schemes, but the non-continuous transmission also reduces coverage (because of the higher peak power needed), mobility (because of lower power control frequency) and complicates radio resource management algorithms.
- the "S” in TD-SCDMA stands for "synchronous", which means that uplink signals are synchronized at the base station receiver, achieved by continuous timing adjustments. This reduces the interference between users of the same timeslot using different codes by improving the orthogonality between the codes, therefore increasing system capacity, at the cost of some hardware complexity in achieving uplink synchronization.
- midamble code is a training sequence, similar to the pilot channel in WCDMA.
- Midamble code is typically located between two segments of data.
- the base station, NodeB, and the mobile station or User Equipment, UE midamble code is used in the first step of baseband processing and channel estimation.
- CIR Channel Impulse Response
- the NodeB can measure the arrival time for Uplink synchronization, AoA (Angel of Arrival) for beamforming generation and the Receiving power of receiving signal.
- the UE can measure the arrival time for downlink synchronization, the receiving power of receiving signal and so on.
- the Channel Impulse Response can also be used for coherent demodulation for receiving data.
- multi carrier methods are used in both TD-SCDMA and TD-HSDPA High-Speed Downlink Packet Access and also in HSUPA High-Speed Uplink Packet Access systems.
- TD-HSDPA it is possible that one single User Equipment UE is allocated resources in a multiple of carriers, e.g. two, three or even more carriers.
- HSUPA for TD-SCDMA.
- Midamble code measurements are isolated for each carrier as in a single carrier system. In a multi-carrier system this can introduce a bigger measurement error, which is undesired.
- This object and others are obtained by the method, the base station and the mobile station as set out in the appended claims.
- MRC Maximum Ratio Combination
- the measurement errors can be significantly reduced.
- the multi-carrier system is a system employing midamble codes such as TD-SCDMA, the power of the midamblc codes are combined.
- the UE in case of a down link signal, or NodeB, in case of an up-link signal, receiving signals on the air interface, will jointly detect all midamble signals at all carriers with radio resources allocated to this user using a suitable combination algorithm such as an MRC algorithm into a combined signal.
- a suitable combination algorithm such as an MRC algorithm
- the measurement will be much more accurate than a measurement carried out in only one carrier. Because down-link synchronization and, Angle of Arrival (AoA) measurement are critical to the performance of a system like the TD-SCDMA system, this will significantly improve the signal receiving quality of such a system.
- AoA Angle of Arrival
- - Fig. 1 is a view of a cellular radio system employing multiple carriers.
- - Fig. 2 is a flow chart illustrating different steps performed when performed when carrying out measurements for a UE. DETAlLED DESCRIPTION
- the system 100 comprises a base station (Node B) 101.
- the base station 101 serves a number of mobile terminals, usually termed User Equipment (UE) 103, located within the area covered by the base station 101.
- UE User Equipment
- the base station 101 is also connected to a radio network controller node (RNC) 105.
- RNC radio network controller node
- the system 100 also comprises a control and measurement unit 107 for carrying out different measurements relating to the UEs of the cell served by the base station 101.
- the unit 107 is preferably co-located or an integral part of the base station 101.
- the UE 103 also comprises hardware and software to process signals received from the base station 101 in order to carry out measurements on the channel between the base station and the UE.
- Fig. 2 a flow chart illustrating steps performed when carrying out measurements in a NodeB for a UE in a cellular radio system such as the system depicted in Fig. 1.
- the NodeB decides whether or not to admit a new UE in a conventional manner using known procedures for admission control.
- the NodeB has accepted the UE radio resources are allocated to the UE in a step 203.
- the radio resources allocated in step 203 may be distributed to more than one carrier.
- the procedure detects the number of carriers assigned to the UE. If the radio resources are confined to one carrier, the procedure proceeds to a step 207 where normal measurements are carried out. If on the other hand the radio resources are distributed on multiple carriers, the procedure proceeds to a step 209. hi step 209 the power of the midamble codes are combined for all carriers for example by using an MRC (Maximum Ratio Combination) algorithm. Thereupon in a step 211, the normal measurements are performed using the combined signal as input.
- MRC Maximum Ratio Combination
- the UE in case of a down link signal, or NodeB, in case of an up-link signal, receiving signals on the air interface, will jointly detect all midamble signals at all carriers with radio resources allocated to this user using a suitable combination algorithm such as an MRC algorithm into a combined signal.
- a suitable combination algorithm such as an MRC algorithm
- the measurement will be much more accurate than a measurement carried out in only one carrier. Because down-link synchronization and, Angle of Arrival (AoA) measurement are critical to the performance of a system like the TD-SCDMA system, the method and device as described herein will significantly improve the signal receiving quality of such a system.
- AoA Angle of Arrival
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07709482.9A EP2122846A4 (en) | 2007-02-15 | 2007-02-15 | Channel measurements on combined pilot signala in multi- carrier systems |
US12/527,525 US20100074127A1 (en) | 2007-02-15 | 2007-02-15 | Channel measurements on combined pilot signala in multi-carrier systems |
CN200780051304.9A CN101611561A (en) | 2007-02-15 | 2007-02-15 | Channel measurement in the multicarrier system on the pilot signal that merges |
PCT/SE2007/050089 WO2008100188A1 (en) | 2007-02-15 | 2007-02-15 | Channel measurements on combined pilot signala in multi- carrier systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE2007/050089 WO2008100188A1 (en) | 2007-02-15 | 2007-02-15 | Channel measurements on combined pilot signala in multi- carrier systems |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008100188A1 true WO2008100188A1 (en) | 2008-08-21 |
Family
ID=39690323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2007/050089 WO2008100188A1 (en) | 2007-02-15 | 2007-02-15 | Channel measurements on combined pilot signala in multi- carrier systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100074127A1 (en) |
EP (1) | EP2122846A4 (en) |
CN (1) | CN101611561A (en) |
WO (1) | WO2008100188A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010129097A3 (en) * | 2009-03-17 | 2011-04-07 | Qualcomm Incorporated | Position location using multiple carriers |
CN105406913A (en) * | 2015-10-27 | 2016-03-16 | 航天恒星科技有限公司 | Signal processing method, device and China mobile multimedia broadcasting system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101646777B1 (en) * | 2009-01-28 | 2016-08-09 | 엘지전자 주식회사 | Method for transmitting midamble in wireless communication system |
CN115632727B (en) * | 2022-09-15 | 2024-06-21 | 鹏城实验室 | Spectrum sensing method and device |
Citations (5)
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EP0955741A1 (en) * | 1997-11-21 | 1999-11-10 | Ntt Mobile Communications Network Inc. | Channel estimating apparatus, and cdma receiver and cdma transceiver each having the apparatus |
WO2000064085A1 (en) * | 1999-04-16 | 2000-10-26 | Motorola Inc. | Channel estimate of a communication channel in a cdma system |
EP1065800A1 (en) * | 1999-07-02 | 2001-01-03 | Lucent Technologies Inc. | Code division multiple access system having improved pilot channels |
EP1107524A2 (en) * | 1999-11-30 | 2001-06-13 | Texas Instruments Incorporated | Channel estimation for communication system |
US20060072691A1 (en) * | 2004-10-06 | 2006-04-06 | Mark Kent | Method and system for HSDPA maximum ratio combination (MRC) and equalization switching |
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DE69838807T2 (en) * | 1998-02-18 | 2008-10-30 | Sony Deutschland Gmbh | Mapping of multicarrier signals in GSM time slots |
CN1252954C (en) * | 2000-08-09 | 2006-04-19 | Sk泰力康姆株式会社 | Wireless telecommunication system switch-over method of supporting upflow chain-path transmission plan |
US6907270B1 (en) * | 2000-10-23 | 2005-06-14 | Qualcomm Inc. | Method and apparatus for reduced rank channel estimation in a communications system |
US7548506B2 (en) * | 2001-10-17 | 2009-06-16 | Nortel Networks Limited | System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design |
KR100640516B1 (en) * | 2004-02-27 | 2006-10-30 | 삼성전자주식회사 | Method and apparatus for transmitting channel quality information in orthogonal frequency division multiple communication system |
US8085875B2 (en) * | 2004-07-16 | 2011-12-27 | Qualcomm Incorporated | Incremental pilot insertion for channnel and interference estimation |
DE102004052899B4 (en) * | 2004-11-02 | 2011-08-18 | Lantiq Deutschland GmbH, 85579 | Both on sporadic as well as on continuous data communication oriented OFDM transmission method for a WLAN |
US7848463B2 (en) * | 2005-04-07 | 2010-12-07 | Qualcomm Incorporated | Adaptive time-filtering for channel estimation in OFDM system |
FI20055229A0 (en) * | 2005-05-16 | 2005-05-16 | Nokia Corp | Signal to interference power estimator |
-
2007
- 2007-02-15 WO PCT/SE2007/050089 patent/WO2008100188A1/en active Application Filing
- 2007-02-15 US US12/527,525 patent/US20100074127A1/en not_active Abandoned
- 2007-02-15 EP EP07709482.9A patent/EP2122846A4/en not_active Withdrawn
- 2007-02-15 CN CN200780051304.9A patent/CN101611561A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0955741A1 (en) * | 1997-11-21 | 1999-11-10 | Ntt Mobile Communications Network Inc. | Channel estimating apparatus, and cdma receiver and cdma transceiver each having the apparatus |
WO2000064085A1 (en) * | 1999-04-16 | 2000-10-26 | Motorola Inc. | Channel estimate of a communication channel in a cdma system |
EP1065800A1 (en) * | 1999-07-02 | 2001-01-03 | Lucent Technologies Inc. | Code division multiple access system having improved pilot channels |
EP1107524A2 (en) * | 1999-11-30 | 2001-06-13 | Texas Instruments Incorporated | Channel estimation for communication system |
US20060072691A1 (en) * | 2004-10-06 | 2006-04-06 | Mark Kent | Method and system for HSDPA maximum ratio combination (MRC) and equalization switching |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010129097A3 (en) * | 2009-03-17 | 2011-04-07 | Qualcomm Incorporated | Position location using multiple carriers |
CN102549448A (en) * | 2009-03-17 | 2012-07-04 | 高通股份有限公司 | Position location using multiple carriers |
US8577387B2 (en) | 2009-03-17 | 2013-11-05 | Qualcomm Incorporated | Position location using multiple carriers |
US9338665B2 (en) | 2009-03-17 | 2016-05-10 | Qualcomm Incorporated | Position location using multiple carriers |
CN105406913A (en) * | 2015-10-27 | 2016-03-16 | 航天恒星科技有限公司 | Signal processing method, device and China mobile multimedia broadcasting system |
CN105406913B (en) * | 2015-10-27 | 2019-07-19 | 航天恒星科技有限公司 | Signal processing method, device and China Mobile Multimedia Broadcasting system |
Also Published As
Publication number | Publication date |
---|---|
EP2122846A4 (en) | 2016-03-30 |
CN101611561A (en) | 2009-12-23 |
EP2122846A1 (en) | 2009-11-25 |
US20100074127A1 (en) | 2010-03-25 |
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