WO2004068763A1 - Procede et appareil destines a l'acquisition de la synchronisation de la liaison montante - Google Patents

Procede et appareil destines a l'acquisition de la synchronisation de la liaison montante Download PDF

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Publication number
WO2004068763A1
WO2004068763A1 PCT/CN2003/000088 CN0300088W WO2004068763A1 WO 2004068763 A1 WO2004068763 A1 WO 2004068763A1 CN 0300088 W CN0300088 W CN 0300088W WO 2004068763 A1 WO2004068763 A1 WO 2004068763A1
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WO
WIPO (PCT)
Prior art keywords
sync
sync pulse
module
uplink
sub
Prior art date
Application number
PCT/CN2003/000088
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English (en)
Inventor
Gang Quan
Yuan Zhang
Original Assignee
Linkair Communications, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linkair Communications, Inc. filed Critical Linkair Communications, Inc.
Priority to PCT/CN2003/000088 priority Critical patent/WO2004068763A1/fr
Priority to AU2003303841A priority patent/AU2003303841A1/en
Priority to CN03825533.2A priority patent/CN1714526A/zh
Publication of WO2004068763A1 publication Critical patent/WO2004068763A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/709—Correlator structure
    • H04B1/7093—Matched filter type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers

Definitions

  • the present invention relates to the physical layer reference design of TD-LAS system. More specifically, the present invention relates to A Method and An Apparatus of Uplink Synchronization Acquisition.
  • LAS-CDMA TDD system or TD-LAS system
  • TD-LAS is designed to be a wireless packet system based on the proprietary LAS-CDMA technology.
  • LAS-CDMA TDD mode we consider LAS-CDMA TDD mode, so in the sequel, we will use interchangeably LAS-CDMA TDD or TD-LAS.
  • the function of Uplink Sync Channel in TD-LAS system is to assure the initial synchronization of all active MS and of their spread codes.
  • LAS-CDMA is a synchronous CDMA system with its special feature of Interference Free Window (IFW). Since there is totally no MAI and ISI in the IFW, so if all users' signal reaches at the same time at Base Station, or within the IFW, then we can get the multiple access interference eliminated. To assure that all the users' signals reach at base station at the same time, all the users are required to acquire synchronization. Since all the users are randomly distributed in the cell, the distances of the users to the Base Station are different each other, and are their propagation delay. Consequently all the users' signals reaching Base Station are not synchronized. Uplink sync channel is designed to insure that the users be synchronized, i.e., arriving at BS at the same time. Summary of the invention
  • the object of the present invention is to provide a method and an Apparatus of uplink synchronization acquisition. It assures that all users' signal reach the Base Station at the same time or within the IFW and can assure all the users acquire synchronization. It can eliminate the multiple access interference.
  • a method of uplink synchronization acquisition comprising the step of:
  • the transmitter of the Sync Channel is located at every User Station.
  • the transmitter generates the sync pulse and according to the message received from BS, transmits in a free sync slot;
  • the transmitter sends sync pulse in an arbitrary position;
  • the BS Base Station
  • the MS adjusts the transmitting position of the sync pulse according to USC; This interaction between BS and MS takes place until the deviation of the received sync pulse from standard position at BS is within a certain limit; Under this condition, the MS is considered to be synchronized successful;
  • the receiver of the Sync Channel is located at Base station;
  • the LAS-CDMA/TDD frame has a duration of 24 ms;
  • the 24ms frame is divided into 14 sub-frames;
  • the first sub-frame called the downlink sync sub-frame, has a length of 874 chips; It is allocated to the D-SYNCH;
  • the second sub-frame called the uplink sync sub-frame, has a length of 962 chips. It is allocated to the U-SYNCH;
  • the remaining 12 sub-frames are traffic sub-frames; Each traffic sub-frame has a duration of at least 2359 chips; Either uplink physical channels or downlink physical channels can use the traffic sub-frames.
  • the said sync pulse is a compressed code of length 60 chips, which is formed by a C code of length 20 chips followed by a 20-chip gap and a S code of length 20 chips.
  • the said USC retrieves the delay control command from the received signal and the transmitting time of the Sync Pulse is adjusted accordingly;
  • the adjusting range is (0 - 42T and the adjusting unit is T 16 , so the delay control command is 10 bits.
  • the said acquisition function implemented at Base Station is to find the position of the Sync pulse, generate the USC and save data for multi-path finding procedure.
  • the receiver should save 6*16 data around the standard position;
  • the range actually is ⁇ 3T C before the standard access chip;
  • the data of the successful access pulse should be used for finding multi-path.
  • An Apparatus of uplink synchronization acquisition comprising: Uplink sync channel transmitter and uplink sync channel receiver;
  • the said uplink sync channel transmitter includes: U-SYNCH code generator, means for framing, means for modulator;
  • the said U-SYNCH code generator generates the sync pulse;
  • the said means for framing is put the sync pulse into a free sync slot, and sends the signal towards, the said modulator;
  • the modulated signal is then transmitted;
  • the said uplink sync channel receiver includes: matching filter, limiter, MRC module, 2 in 1 module, means for creating USC, means for finding multi-path;
  • the received base-band signal is input to the said matching filter;
  • the output of the said matching filter is combined in the said MRC module;
  • MRC module is input to the said 2 in 1 module;
  • the output of the said 2 in 1 module is input to the said limiter;
  • the output of the said limiter is input to the said means for creating USC and means for finding multi-path respectively.
  • the transmitted signal should be: (A + jB)(R e + // makeup,) ;
  • the l-route should be R e : the real part of the sync pulse, and the Q-route should be I m : the image part of the sync pulse.
  • the said modulator consists of Base band Filter (BF) and the carrier modulator;
  • the BF implemented here is a root raised cosine filter
  • the carrier frequency (Intermediate Frequency - IF) is 4/ c with sampling frequency of 16 /. ;
  • the modulated signal is then transmitted.
  • the said matching filter includes:
  • the received base-band signal is first fed to a 16-sample length sliding window
  • the output of the said 16-sample length sliding window is input to the said matched filter.
  • the said limiter includes:
  • Limiter 1 has a fixed threshold — T1 ; If the input signals are all less than T1 , it declares that there is no sync pulse in this time slot; The threshold of limiter 1 should be set as a parameter that can be changed during the test.
  • the said MRC module includes:
  • the output of the matched filter of each antenna is combined by the MRC algorithm;
  • the FMV module finds the maximum value among the matching filter output data of one sync time, which is used as the weighting value.
  • the said 2 in 1 module combines two continued MF output of two access slots of a U-SYNPCH sub-channel.
  • said means for creating USC includes:
  • Limiter 2 sliding window, evaluator;
  • the said Limiter 2 removes the input signals whose value is less than the product of the threshold — T2 and the output of the FMV module; Its function is to remove some noise; T2 is a configurable parameter;
  • the output of the said Limter2 module is then fed to the sliding window block, which is made of two delay circuits and an accumulator;
  • the said sliding window sums the energy of several continuous paths, and translates the data from the energy of point to the energy of block.
  • the said evaluator module receives the signal coming from the said sliding window
  • the said evaluator is comprised of FPLM-T (Find Position of Last Max value with Tolerance), a subtracter and a JUDGE block;
  • the FPLM-T fulfills the function below. It finds, at first, the maximum value in a block of 110*16 signals; and, it then finds the position of the last value which has no more difference than a small value with the maximum value;
  • the small value equals the product of the threshold — T3 and the maximum value; T3 is a configurable parameter; At last uses this position subtract the standard position to get USC; The value of USC is then compared to a small value (sync precision) at the module JUDGE to judge whether the sync is successful or not.
  • the present invention provides a method and an Apparatus of uplink synchronization acquisition. It assures that all users' signals reach at the Base Station at the same time or within the IFW and assures that all the users acquire synchronization. It eliminates the multiple access interference.
  • Fig. 1 s Frame Structure at the Base Station;
  • Fig. 2 s Structure of the Uplink sync channel;
  • Fig. 3 Sync pulse;
  • Fig. 4 s 4 sector of phasell;
  • Fig. 5 s the position of the sync pulse in the sync time slot;
  • Fig. 6 s action of the MS during the uplink initial sync;
  • Fig. 7 s action of the BS during the uplink initial sync;
  • Fig 8 is Interface with other units in MS;
  • Fig 9 is Uplink Sync Channel Transmitter
  • Fig. 10 is Interface with other units in BS;
  • Fig. 11 is Uplink Sync Channel Receiver;
  • Fig. 12 is Uplink Sync Channel Matching Filter;
  • Fig. 13 is MRC algorithm
  • Fig. 14 is Create USC Algorithm.
  • LAS-CDMA is a synchronous CDMA system with its special feature of Interference Free Window (IFW). Since there is totally no MAI and ISI in the IFW, so if all users' signal reaches at the same time at Base Station or within the IFW then we can eliminate the multiple access interference. To assure all the users' signal reaches base station at the same time, all the users are required to acquire synchronization. Since all the users are randomly distributed in the cell, the distance of each user from the Base Station is different, and so the propagation delay. Consequently all the users' signal reaching Base Station is not synchronized. Uplink sync channel is assigned to support the users to be initially synchronized.
  • IFW Interference Free Window
  • every user sends a fixed sequence of Sync Pulse, at the Base Station the received signal is processed so that to get the distance of the position of it from the Standard Position. Then the uplink sync channel receiver will create Uplink Sync Control (USC) command. The USC is sent to the user station to adjust its transmitting position. When the USC is in certain limit (precision) then the user is said to have acquired synchronization and start communication.
  • USC Uplink Sync Control
  • the LAS-CDMA/TDD frame is duration of 24 ms.
  • the 24ms frame is divided into 14 sub-frames.
  • the second sub-frame called the uplink sync sub-frame, has a length of 962 chips. It is allocated to the U-SYNCH.
  • the remaining 12 sub- frames are called traffic sub-frames.
  • Each traffic sub-frame has duration of at least 2359 chips. Either uplink physical channels or downlink physical channels can use the traffic sub-frames.
  • Figure 1 shows the frame structure.
  • Uplink Sync Channel 82 chips are as gap to separate the uplink sync channel with other channels. There are altogether 8 Time Slots each of length 110 chips in U-SYNCH.
  • Figure 2 illustrates the sub-frame structure of the uplink (reverse) sync channel.
  • the U-SYNPCH consists of eight U-SYNPCH sub-channels. Each sub-channel is an unmodulated common channel to transmit two access bursts in a frame, one burst in an access slot. Table 1 shows the association of two access slots with each sub-channel.
  • a code of two symbols (a 0 , a.,), are spread in a frame, a 0 for the first time slot and a 1 for the second time slot.
  • Codes for U-SYNPCH sub-channels are given in Table 2 and used for differentiating different type of access. It is noted that they are orthogonal.
  • Sync pulse is shown in the following figure 3. It is a compressed code of length 60 chips, which is formed by a C code of length 20 chips followed by a 20- chip gap and a S code of length 20 chips.
  • Figure 5 shows the position of the sync pulse in the sync time slot.
  • the user station gets the information of all 8-uplink sync channel Time Slots (TS) from the downlink channel.
  • the user station sends the sync pulse (60 chips) in two free time slots (110chips each).
  • the user may be located in any place in the cell in other words the distance of the user from the base station is not known at the beginning.
  • all the users are supposed to be at the edge of the cell so the user station starts sending a sync pulse at position « ⁇ ll0 and (n+4)*110. Where 'n' is the number of TS.
  • the base station receives the sync pulse transmitted by user stations and calculates the distance from the standard position to generate the uplink sync control (USC).
  • USC uplink sync control
  • the USC is then transmitted to the respective user stations and accordingly the user stations adjust their transmitting time. This interaction between user stations and base station continues until the position of received sync pulse at base station is in certain limit. Then the Synchronization acquisition procedure is successful, and the system can turn to the following procedures.
  • the USC command is transmitted by word RPAB in ACPCH.
  • the mark of success is transmitted by word ACK in ACPCH.
  • the action of the MS is illustrated as Fig.6.
  • the action of the BS is illustrated as Fig.7.
  • the Uplink sync Channel Transmitter is described as follow:
  • the up layer decides the transmission time of the sync pulse depending on the U-SYNCH time slot the MS selected and the delay control command from the BS.
  • the transmitter of the Sync Channel is located at every User Station.
  • the transmitter simply generates the sync pulse and according message received from BS, transmits in a free sync slot.
  • the transmitter sends sync pulse in arbitrary position.
  • the BS Base Station
  • the MS adjusts the transmitting position of the sync pulse according to USC. This interaction between BS and MS takes place until the deviation of the received sync pulse from standard position at BS is within certain limit. In this condition, the MS is considered to be sync successful.
  • U-SYNCH code generator Generates the Sync pulse of length 60 chips. We assumed that the transmitted symbol is (_4 + /R) and the sync pulse is (R e +j ' I m ) .
  • the transmitted signal should be: (A + j ' B)(R e +j ' I m ) .
  • USC USC is the acronym of Uplink Sync Control.
  • the USC block retrieves the delay control command from the received signal (delay control command is transmitted by Base Station to the user station) and the transmitting time of the Sync Pulse is adjusted accordingly.
  • the adjusting range is (0 ⁇ 42T C ) and the adjusting unit is T c l ⁇ 6 , so the delay control command is 10 bits.
  • Framing In this block Sync pulse is put into a free Sync slot and sends the signal towards Modulator.
  • the Modulator consists of Base band Filter (BF) and the carrier modulator.
  • the BF implemented here is a time rolled off raised cosine filter with roll off factor 0.5.
  • the carrier frequency (Intermediate Frequency - IF) is Af c with sampling frequency of ⁇ 6f c . The modulated signal is then transmitted.
  • the Uplink sync Channel receiver is described as follow:
  • the receiver of the Sync Channel is located at Base station.
  • the acquisition algorithm implemented at Base Station is to find the position of the each path of the multi path transmission.
  • Matching filter The received base-band signal fed to a 16-sample length sliding window.
  • Limiterl has a fixed threshold — T1. If the input signals are all less than T1 , it denotes that there is no sync pulse in this time slot.
  • the threshold of limiterl should be set as a parameter that can be changed during the test.
  • MRC module The output of the matched filter of each antenna is combined as MRC algorithm.
  • the FMV module finds the maximum value among the matching filter output data of one sync time, which use as weighting value.
  • the physical structure is showed as Fig.13.
  • 2in1 module This module combines two continued MF output of two access slots of a U-SYNPCH sub-channel.
  • the code depict in Table 2 should be despreaded here.
  • Create USC Algorithm The receiver creates USC by finding the position of the max energy block, (as shown in Fig.14)
  • the module Limiter2 removes the input signals whose value is less than the product of the threshold — T2 and the output of the FMV module. Its function is to remove some noise. T2 is a configurable parameter. SLIDING WINDOW: The output of the Limter2 module is then fed to the
  • the EVALUATOR module receives the signal coming from the
  • the EVALUATOR module is comprised of FPLM-T (Find Position of Last Max value with Tolerance), a subtracter and a JUDGE block.
  • the FPLM-T fulfill the function below: first finds the maximum value in a block of 110*16 signals; and then finds the position of the last value which has no more difference than a small value with the maximum value. The small value equals the product of the threshold — T3 and the maximum value. T3 is a configurable parameter. At last uses this position subtract the standard position to get USC. The value of USC is then compared with a small value (sync precision) at the module JUDGE to judge whether the sync is successful or not.
  • Find multi-path algorithm The receiver should save 6*16 data around the standard position. The range actually is + T C before the standard access chip. The data of the successful access pulse should be used for find multi-path algorithm.
  • the present invention provides a method and an Apparatus of uplink synchronization acquisition. It can assure all users' signal reaches the Base Station at the same time or within the IFW and can assure all the users acquire synchronization. It can eliminate the multiple access interference.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un appareil destinés à l'acquisition de synchronisation de la liaison montante. Elle consiste en ce qui suit: l'émetteur du canal Sync est localisé à chaque station d'utilisateur; l'émetteur génère l'impulsion Sync et, en fonction du message reçu depuis la station de base, l'émetteur envoie l'impulsion Sync dans une position arbitraire; la station de base reçoit l'impulsion Sync et calcule la déviation par rapport à la position standard puis envoie USC vers la station mobile (MS); cette interaction entre la station de base et la station mobile a lieu jusqu'à ce que la déviation de l'impulsion sync reçue par rapport à la station de base reste dans certaines limites; le récepteur du canal Sync se trouve dans la station de base. Il permet d'assurer l'arrivée simultanée de tous les signaux d'utilisateur à la station de base ou à l'intérieur d'IFW et éventuellement l'acquisition de la synchronisation par tous les utilisateurs. On peut éliminer l'interférence lors de l'accès multiple.
PCT/CN2003/000088 2003-01-27 2003-01-27 Procede et appareil destines a l'acquisition de la synchronisation de la liaison montante WO2004068763A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2003/000088 WO2004068763A1 (fr) 2003-01-27 2003-01-27 Procede et appareil destines a l'acquisition de la synchronisation de la liaison montante
AU2003303841A AU2003303841A1 (en) 2003-01-27 2003-01-27 A method and an apparatus of uplink synchronization acquisition
CN03825533.2A CN1714526A (zh) 2003-01-27 2003-01-27 一种上行链路同步获得方法及其装置

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PCT/CN2003/000088 WO2004068763A1 (fr) 2003-01-27 2003-01-27 Procede et appareil destines a l'acquisition de la synchronisation de la liaison montante

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101110632B (zh) * 2006-07-19 2011-09-28 联芯科技有限公司 Td-scdma系统中确定同步控制命令的方法及装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100904533B1 (ko) 2008-01-11 2009-06-25 엘지전자 주식회사 전송 타이밍 조절 방법, 연속적인 패킷 전송 방법 및 이동통신 단말
DE102015102605A1 (de) * 2015-02-24 2016-08-25 Intel IP Corporation Verfahren und Vorrichtung zum Unterdrücken eines Fehlers einer Funkkanalsequenz
WO2016161438A1 (fr) 2015-04-03 2016-10-06 Dali Systems Co. Ltd. Procédé et système pour la synchronisation de liaison dans une architecture lte-drt

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001024411A1 (fr) * 1999-09-28 2001-04-05 Siemens Aktiengesellschaft Procede et systeme permettant de maintenir une synchronisation de liaison montante dans des systemes de communication mobiles bases sur un amrc
WO2001043307A2 (fr) * 1999-12-08 2001-06-14 Siemens Aktiengesellschaft Procede de maintien d'une transmission de signaux synchronisee dans le sens ascendant dans un systeme de radiocommunication
WO2001097411A1 (fr) * 2000-06-12 2001-12-20 Samsung Electronics Co., Ltd Procede permettant d'assigner un acces aleatoire sur canal de liaison montante dans un systeme de communication mobile cdma

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001024411A1 (fr) * 1999-09-28 2001-04-05 Siemens Aktiengesellschaft Procede et systeme permettant de maintenir une synchronisation de liaison montante dans des systemes de communication mobiles bases sur un amrc
WO2001043307A2 (fr) * 1999-12-08 2001-06-14 Siemens Aktiengesellschaft Procede de maintien d'une transmission de signaux synchronisee dans le sens ascendant dans un systeme de radiocommunication
WO2001097411A1 (fr) * 2000-06-12 2001-12-20 Samsung Electronics Co., Ltd Procede permettant d'assigner un acces aleatoire sur canal de liaison montante dans un systeme de communication mobile cdma

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101110632B (zh) * 2006-07-19 2011-09-28 联芯科技有限公司 Td-scdma系统中确定同步控制命令的方法及装置

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