WO1998018217A9 - Transmission timing offset method for ds-cdma mobile telephone systems - Google Patents
Transmission timing offset method for ds-cdma mobile telephone systemsInfo
- Publication number
- WO1998018217A9 WO1998018217A9 PCT/SE1997/001632 SE9701632W WO9818217A9 WO 1998018217 A9 WO1998018217 A9 WO 1998018217A9 SE 9701632 W SE9701632 W SE 9701632W WO 9818217 A9 WO9818217 A9 WO 9818217A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- symbols
- slot
- integer number
- transmitting
- steps
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
Definitions
- the present invention relates to code division multiple access (CDMA) mobile telephone systems, and more particularly, to a method for averaging interference over time between users utilizing discontinuous transmissions in a CDMA system.
- CDMA code division multiple access
- each physical channel carries a nominal information bit rate. If the information to be transmitted is less than this nominal bit rate, discontinuous transmission (DTX) may be used. Discontinuous transmission means that data is not transmitted over a user channel 100% of the time.
- DTX discontinuous transmission
- CDMA Code Division Multiple Access
- TPC transmitter power control
- Discontinuous transmission may be done in one of two ways. In one method referred to as “frame-wise DTX", the system only transmits one-half of the slots from any frame when half the nominal bit-rate is used. Another method referred to as “slot-wise DTX” transmits one-half of the time during each slot of a frame.
- the slot-wise DTX method has the advantage that the interleaving depth will be kept at a maximum even for low bit rates.
- the present invention overcomes the foregoing and other problems with a method for altering transmission timing offsets within a DS-CDMA mobile telephone system.
- a number of signals are transmitted over a plurality of parallel connections as slot-wise discontinuous transmissions between a base station and a mobile station.
- the transmission timings of each one of the plurality of connections is altered by a predetermined number of symbols such that the transmission beginning and ending periods are not the same between any two of the plurality of parallel connections.
- the predetermined number of symbols may be calculated as a deterministic function of a short CDMA code number, or alternatively, may be a predefined value that is forwarded to the mobile station via a signaling channel from the base station.
- the desired effect may be achieved by limiting the predetermined value to the interval (0,N), where N is the number of symbols per slot of a frame.
- FIGURE 1 illustrates a prior art solution to unevenly spread interference between cells
- FIGURE 2 illustrates the frame structure of a typical DS-CDMA system
- FIGURE 3 illustrates discontinuous slot-wise transmissions of a typical DS- CDMA frame structure
- FIGURE 4 is an illustration of the randomization method of the present invention.
- Each DS-CDMA frame 10 consists of a plurality of slots 15.
- the frames have a 10 ms length and include 16 slots 15 each.
- the slots 15 in each frame 10 are not used for different users, but instead, define the transmitter power control (TPC) cycle time.
- TPC transmitter power control
- Multiplexed pilot symbols may also be used to enable coherent detection in the reverse or forward link. Multiplexed pilot symbols are normally aligned with the TPC symbols 20.
- the data portion 25 of the time slot and the TPC/pilot symbols are continuously transmitted throughout the entire frame structure. However, in certain circumstances, discontinuous transmission will be desired.
- FIGURE 4 there is illustrated the method of the present invention wherein a plurality of slot-wise discontinuous transmissions 50 are offset in a manner such that an interference averaging effect is achieved. This is accomplished by offsetting the entire connection timing of each user 55 by an integer number of symbols of the frame structure. While the preferred embodiment of the invention is described with respect to offsetting the timing by an integer number of symbols, the timing may also be offset by any amount in other embodiments.
- the connection of user 1 is unaffected and transmits in the fashion that it normally would for slot-wise discontinuous transmission.
- each of the users 2-4 are offset by some integer number of symbols, such that they are not starting and stopping transmissions at the exact same times as user 1 or as each other.
- the offsets may be determined from the CDMA code phase or CDMA code number of the connection number and may be limited to the interval (0, ⁇ ) where N s is the number of symbols per slot.
- the offset may be predefined, for example, the first connection would have an offset of 0, the second connection would have an offset of one symbol, the third connection would have an offset of two symbols, etc. In this case, the mobile station would have to be informed of the offsets over a signaling channel.
- This method provides a simple way of averaging the interference of different users on the forward link of a DS-CDMA system.
- the method does not noticeably increase the receiver complexity and the offset scheme is easily determined by the mobile station receiver or, in the case of a predefined offset, is transmitted to the receiver via a signaling channel.
- Receiver complexity is not increased since once the offset for a channel is determined it will always be the same.
- the scheme provides no additional dispersion of the receiver timings of different slots, and only information regarding one timing offset is needed by the receiver in order to properly demodulate the signal.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002268665A CA2268665A1 (en) | 1996-10-18 | 1997-09-26 | Transmission timing offset method for ds-cdma mobile telephone systems |
AU47303/97A AU4730397A (en) | 1996-10-18 | 1997-09-26 | Transmission timing offset method for ds-cdma mobile telephone systems |
EP97909780A EP0965186A1 (en) | 1996-10-18 | 1997-09-26 | Transmission timing offset method for ds-cdma mobile telephone systems |
JP10519270A JP2001503219A (en) | 1996-10-18 | 1997-09-26 | Transmission timing offset method for DS-CDMA mobile telephone system |
BR9711931A BR9711931A (en) | 1996-10-18 | 1997-09-26 | Processes for obtaining an average interference effect between a plurality of parallel connections and for transmitting in a ds-cdma system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US73325696A | 1996-10-18 | 1996-10-18 | |
US08/733,256 | 1996-10-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1998018217A1 WO1998018217A1 (en) | 1998-04-30 |
WO1998018217A9 true WO1998018217A9 (en) | 1999-05-27 |
Family
ID=24946859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1997/001632 WO1998018217A1 (en) | 1996-10-18 | 1997-09-26 | Transmission timing offset method for ds-cdma mobile telephone systems |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0965186A1 (en) |
JP (1) | JP2001503219A (en) |
KR (1) | KR20000052644A (en) |
CN (1) | CN1234153A (en) |
AR (1) | AR011254A1 (en) |
AU (1) | AU4730397A (en) |
BR (1) | BR9711931A (en) |
CA (1) | CA2268665A1 (en) |
RU (1) | RU99110385A (en) |
WO (1) | WO1998018217A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6393010B1 (en) * | 1998-08-19 | 2002-05-21 | Qualcomm Incorporated | Time offset technique for increasing the capacity of a CDMA system |
US6310869B1 (en) * | 1998-08-31 | 2001-10-30 | Qualcomm Incorporated | Method and apparatus for reducing amplitude variations and interference in communication signals, such as in wireless communication signals employing inserted pilot symbols |
US6396817B2 (en) | 1998-08-31 | 2002-05-28 | Qualcomm Incorporated | Signal splitting method for limiting peak power in a CDMA system |
FI108270B (en) | 1998-11-09 | 2001-12-14 | Nokia Corp | Method and arrangement for optimized timing of measurements in co-operation with interval frame procedure in a cellular radio system |
US6721349B1 (en) * | 1999-01-28 | 2004-04-13 | Qualcomm Incorporated | Method and apparatus for reducing peak-to-average ratio in a CDMA communication system |
JP3410379B2 (en) * | 1999-02-26 | 2003-05-26 | 松下電器産業株式会社 | Wireless communication base station apparatus and wireless communication method |
KR100556488B1 (en) * | 1999-08-12 | 2006-03-03 | 엘지전자 주식회사 | method for controlling the packet transmission, which is based on reverse link common channel |
FR2799323B1 (en) * | 1999-10-04 | 2002-04-19 | Mitsubishi Electric France | METHOD FOR GENERATING A COMPRESSED MODE ON A COMPOSITE CHANNEL COMPRISING AT LEAST TWO TRANSPORT CHANNELS AND DEVICE FOR CARRYING OUT SAID METHOD |
FR2799322B1 (en) * | 1999-10-04 | 2001-12-28 | Mitsubishi Electric France | METHOD FOR GENERATING A COMPRESSED MODE ON A COMPOSITE CHANNEL COMPRISING AT LEAST TWO TRANSPORT CHANNELS AND DEVICE FOR CARRYING OUT SAID METHOD |
US6665288B1 (en) | 1999-11-08 | 2003-12-16 | Ericsson Inc. | Method and apparatus for reducing synchronization code interference in CDMA communications systems |
US7292552B2 (en) | 2002-03-14 | 2007-11-06 | Qualcomm Incorporated | Method and apparatus for reducing interference in a wireless communication system |
US7542736B2 (en) | 2005-07-26 | 2009-06-02 | M/A-Com, Inc. | Techniques to decrease signal amplitude peak-to-average ratio in a wireless communications system |
US20120176948A1 (en) * | 2009-08-28 | 2012-07-12 | Satish Nanjundaswamy Jamadagni | Method and system for enhancing transmission in a multi-user reusing one single timeslot operation |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994021056A1 (en) * | 1993-03-05 | 1994-09-15 | Ntt Mobile Communications Network Inc. | Random access communication method by use of cdma, and system for mobile stations which use the method |
TW306102B (en) * | 1993-06-14 | 1997-05-21 | Ericsson Telefon Ab L M | |
JP2726220B2 (en) * | 1993-07-05 | 1998-03-11 | 沖電気工業株式会社 | Code division multiple access equipment |
US5729570A (en) * | 1994-12-08 | 1998-03-17 | Stanford Telecommunications, Inc. | Orthogonal code division multiple access communication system having multicarrier modulation |
-
1997
- 1997-09-26 EP EP97909780A patent/EP0965186A1/en not_active Withdrawn
- 1997-09-26 CN CN97198880A patent/CN1234153A/en active Pending
- 1997-09-26 WO PCT/SE1997/001632 patent/WO1998018217A1/en not_active Application Discontinuation
- 1997-09-26 CA CA002268665A patent/CA2268665A1/en not_active Abandoned
- 1997-09-26 KR KR1019990703412A patent/KR20000052644A/en not_active Application Discontinuation
- 1997-09-26 JP JP10519270A patent/JP2001503219A/en active Pending
- 1997-09-26 BR BR9711931A patent/BR9711931A/en not_active Application Discontinuation
- 1997-09-26 RU RU99110385/09A patent/RU99110385A/en not_active Application Discontinuation
- 1997-09-26 AU AU47303/97A patent/AU4730397A/en not_active Abandoned
- 1997-10-16 AR ARP970104779A patent/AR011254A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
JP2001503219A (en) | 2001-03-06 |
BR9711931A (en) | 1999-08-24 |
AU4730397A (en) | 1998-05-15 |
CN1234153A (en) | 1999-11-03 |
AR011254A1 (en) | 2000-08-16 |
EP0965186A1 (en) | 1999-12-22 |
RU99110385A (en) | 2001-03-10 |
WO1998018217A1 (en) | 1998-04-30 |
CA2268665A1 (en) | 1998-04-30 |
KR20000052644A (en) | 2000-08-25 |
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