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WO2001074021A1 - Procede pour signaler le debut d'un canal logique dans un canal de transmission physique utilise en commun d'un systeme de radiocommunication - Google Patents

Procede pour signaler le debut d'un canal logique dans un canal de transmission physique utilise en commun d'un systeme de radiocommunication Download PDF

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Publication number
WO2001074021A1
WO2001074021A1 PCT/DE2001/001171 DE0101171W WO0174021A1 WO 2001074021 A1 WO2001074021 A1 WO 2001074021A1 DE 0101171 W DE0101171 W DE 0101171W WO 0174021 A1 WO0174021 A1 WO 0174021A1
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WO
WIPO (PCT)
Prior art keywords
bcch
logical channel
channel
frame
time frame
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/DE2001/001171
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German (de)
English (en)
Inventor
Stefan Bahrenburg
Volker Franz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2001074021A1 publication Critical patent/WO2001074021A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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]
    • H04B7/2653—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 logical channel control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying

Definitions

  • the invention relates to a method for signaling the start of a logical channel in a shared physical transmission channel of a radio communication system.
  • radio communication systems for example the second-generation European mobile radio system GSM (Global System for Mobile Communications)
  • information for example voice, image information or other data
  • the radio interface relates to a connection between a base station and subscriber stations, the subscriber stations being, for example, mobile stations or fixed radio stations.
  • the electromagnetic waves are emitted at carrier frequencies that lie in a frequency band provided for the respective system.
  • UMTS Universal Mobile Telecommunication System
  • frequencies in the frequency band of approx. 2000 MHz are planned.
  • Two modes are provided for the third mobile radio generation, one mode denoting FDD operation (frequency division duplex) and the other mode denoting TDD operation (time division duplex).
  • UMTS mobile radio systems have shared physical transmission channels, so-called P-CCPCH (Primary Common Control Physical Channel), in which, for example, both a general signaling channel BCCH (Broadcast Control Channel) with organizational information and a so-called paging channel PCH (Pagmg Channel) can be sent separately as logical channels.
  • the logical channels are additionally nested over a certain number of time frames (mterleaved) within the m time frames (frames) and superordinate so-called superframe structured radio interface.
  • the term interleaving frame is also used for the number of interleaved time frames for a logical channel.
  • the BCCH and the nesting depth corresponds to the PCH, for example, four time frames.
  • the subscriber station must use a so-called try and error technique to determine the start of an interleaving frame. If the so-called CRC check fails during the demodulation, the subscriber station must assume a further start of an interleaving frame or a poorly received start of an interleaving frame. This disadvantageously reduces the reliability and the speed of the detection of the logical channel. Furthermore, the subscriber station often has to detect time frames that belong to an incomplete nesting frame and then reject them. This disadvantageously increases energy consumption as well as the time until a complete nesting frame is received.
  • the subscriber station can detect the start of an interleaving frame, the subscriber station can determine the position of the currently received time frame within an interleaving frame, and the subscriber station can detect the position of the interleaving frame within a superframe.
  • the subscriber station could refrain from further detection of the missing time frames.
  • a superframe consists of 48 time frames. Inside this superframe are, for example, two nesting frames, each with four
  • BCCH timeframe arranged.
  • the subscriber station only wanted to detect the BCCH, it could specifically suppress the detection of the PCHs sent in the further time frame.
  • the object of the invention is to provide a method which enables reliable signaling of the start of a logical channel. This object is achieved by the method having the features of patent claim 1 and by the base station system of patent claim 17. Advantageous developments of the invention can be found in the dependent claims.
  • 1 shows a block diagram of a radio communication system.
  • 2 shows a schematic representation of the frame structure of a radio interface with a TD-SCDMA subscriber separation method
  • FIG. 3 shows a section of the frame structure from FIG. 3, and 4 shows a schematic representation of the coding of a
  • FIG 5 table 1 FIG 6 table 2
  • a mobile radio system consists in each case of a multiplicity of mobile switching centers MSC (Mobile Switchmg Center), which belong to a switching network (SSS - Switchmg Subsystem) and are networked with one another or provide access to a fixed network, and each with one or more Mobile switching centers MSC connected base station systems BSS (Base Station Subsystem).
  • a base station system BSS in turn has at least one device RNC (Radio Network Controller) for assigning radio resources and at least one base station NB (node B) connected to it.
  • MSC Mobile Switchmg Center
  • SSS - Switchmg Subsystem switching network
  • BSS Base Station Subsystem
  • a base station system BSS in turn has at least one device RNC (Radio Network Controller) for assigning radio resources and at least one base station NB (node B) connected to it.
  • RNC Radio Network Controller
  • a base station NB can establish and maintain connections to subscriber stations UE (user equipment) via a radio interface.
  • At least one radio cell Z is formed by each base station NB.
  • the size of the radio cell Z is generally determined by the range of a general signaling channel BCCH (Broadcast Control Channel), which is sent by the base stations NB with a constant transmission power.
  • BCCH Broadcast Control Channel
  • Other logical signaling channels such as a Pagmg channel PCH (Pag g channel), a notification channel (NCH - Notification Channel) or an access confirmation channel (AGCH - Access Grant Channel) are timed together with the signaling channel BCCH separated in a physical transmission channel P-CCPCH sent.
  • a pilot channel pilot sends synchronization sequences from the base station NB, which are used to synchronize the subscriber station UE with the time base of the base station NB.
  • a plurality of radio cells Z can also be supplied per base station NB.
  • the functional act of this structure can be transferred to other radio communication systems in which the invention can be used.
  • FIG. 1 shows a subscriber station UE which is located in the radio cell Z of a base station NB.
  • the subscriber station UE has set up a communication link to the base station NB, on the upward UL and downward direction DL, a signal transmission of a selected service takes place.
  • the communication connection is separated by one or more spreading codes assigned to the subscriber station UE from communication connections established in parallel in the radio cell Z, the subscriber station UE in each case providing part or all of the spreading codes currently assigned to the radio cell Z for receiving the signals of the own communication connection in accordance with the Known Jo t detection method uses.
  • the frame structure of the radio transmission of the TD-SCDMA mobile radio system can be seen from FIG.
  • the frequency band B for the upward direction UL corresponds to the frequency band B for the downward direction DL.
  • the same is repeated for further carrier frequencies. Due to the variable assignment of the tent slots ts for the upward or downward direction UL, DL, a variety of asymmetrical resource allocations can be made.
  • Part of the time slots tdO .-. Tdn is used accordingly for the signal transmission in the downward direction DL (Downlmk) and the other time slots tuO ... turn for the signal transmission in the upward direction UL (Upl k).
  • Following the first time slot tdO for the downward direction DL there is a guard time for separating the transmission lines DL and UL, which represents the switchover point SP.
  • the protection time consists of a downward pilot time slot DPTS (downlmk pilot time slot) with a length of 75 us for sending synchronization sequences differentiated by a set of so-called gold codes, and a protection time GP (guard period) with a length of 75 us for the switching process between sending and receiving m of the base station NB, and from an upward pilot time slot UPTS (Upl k Pilot Time Slot) with a length of 125 us for sending a synchronization sequence when a connection attempt is made by a subscriber station UE with a subsequent signal on the channel for random access R ⁇ CH.
  • DPTS downward pilot time slot
  • GP guard period
  • UPTS Upl k Pilot Time Slot
  • the data d are spread individually with a fine structure, a spreading code cO, cl ... cn, so that, for example, n connections can be separated on the receiving side by this CDMA component.
  • the spreading of individual symbols of the data d has the effect that Q chips of the duration Tc are transmitted within the symbol duration T sym .
  • the Q chips form the connection-specific spreading code c.
  • a channel measurement sequence tseq for a channel estimation at the receiving end is also embedded in the radio blocks.
  • a radio block is completed with a protection time gp.
  • Chip rate 1.28 Mchip / s frame duration: 5 ms
  • Duration of a time slot 675 ⁇ s spreading factor: 1 to 16
  • the method according to the invention for signaling the start of a time frame within an interleaving frame, for signaling the position of a time frame within an interleaving frame or for signaling the position sition of the nesting frame within a superframe is based on a modulation of the phase of the pilot channel pilot in the waiting pilot time slot DPTS.
  • the midamble, also referred to as the training sequence tseq, of the shared physical transmission channel P-CCPCH is used as a reference value for determining the phase difference.
  • this channel as a reference value has the advantage that it is sent every time frame for and the midamble always corresponds to the first derivative of the midamble basic code used in the radio cell. This is known per se to the subscriber station UE.
  • the P-CCPCH is always sent to the last time slot tdO for the downward direction DL, so that there is a minimum distance a between the center of the midamble tseqO and the center of the synchronization sequence sync of the pilot channel pilot .
  • the distance a between the midamble tseqO and the synchronization sequence sync in the TD-SCDMA system is, for example, 393.75 us or 31.5 symbols, and determines the effects of the time variation and frequency offset on the detection algorithm used.
  • the midamble of the P-CCPCH and the region around the DPTS are detected.
  • a channel estimation is then carried out in the channel treasure window for the P-CCPCH.
  • the strongest channel impulse taps are evaluated using a channel impulse response post processing algorithm used for a known jomt detection process.
  • the contents of DPTS means of a sogenann ⁇ th matched filter is detected (convolutionally encoded with the Ka nalimpulsantwort) and the output signal of the matched filter demodulated.
  • the frequency offset is determined by means of the ⁇ mid-range tseqO and / or the synchronization sequence sync
  • the information of the frequency tracking algorithm is used for the removal of the frequency offset, this can be used for a double check during the detection of the P - CCPCH are carried out
  • an adaptive equalization is used to update the channel impulse response, the channel impulse response at the end of the P-CCPCH radio block being taken into account as a reference for determining the modulation of the pilot channel pilot, and a channel estimation using the last detected symbol of the P-CCPCH performed.
  • two bits per time frame can be signaled. These two bits are sufficient for signaling, for example, the position of the current time frame within an interleaving frame. More than one time frame is necessary to signal further information.
  • the position of the current time frame within a nesting frame is signaled every time frame. This corresponds to the example table 1 m FIG. 5 assigns the respective time frame number to a specific phase difference in comparison to a previously determined phase. The phase difference is determined, for example, in every time frame.
  • the minimum number of time frames to be detected, in order to determine the position within the nesting frame is one in this embodiment. For example, to determine a BCCH time frame within a super frame of 43 time frames, at least 4 time frames must be detected.
  • the position of the time frame within an interleaving frame is advantageously coded directly; after only one detection of a DPTS, the position can be determined.
  • further steps can be carried out.
  • the first and third time frames of an interleaving frame are differently coded without possible ambiguity, and the second and fourth time frames sm ⁇ are coded with double ambiguity.
  • the start of an interleaving frame is signaled differently and the position within a superframe is signaled directly in the first and third time frames of an interleaving frame.
  • the direct signaling can be used to indicate, for example, the start of the next BCCH nesting frame the.
  • the P-CCPCH has two equidistant BCCH nesting frames within 12 nesting frames of a superframe.
  • the following scheme, shown in Table 2 in FIG. 6, is used to signal the start of the next BCCH nesting frame.
  • the phase for the first time frame is defined within the nesting frame according to the rule shown.
  • the phase for the third time frame within the nesting frame is 90 ° larger.
  • the first time frame mnerhalo of the nesting frame is characterized by a phase difference of 0 or + 90 ° compared to the phase of the previous time frame.
  • the third time frame within the nesting frame is accordingly characterized by a phase difference of -90 °.
  • the subscriber station can determine the first time frame of the nesting frame within two or four time frames and then determine whether this nesting frame is a BCCH or only one of the following nesting frames corresponds to the BCCH.
  • the minimum number of time frames to be detected for determining the position of the nesting frame is 2 to 3 in this method.
  • the minimum number of time frames to be detected for determining the BCCH nesting frame is accordingly 2 to 3.
  • the position of a Nesting frames are advantageously signaled with ambiguities.
  • both the start of a nesting frame and its position within a superframe are signaled directly.
  • the phase 45 ° is reserved for marking the start of a nesting frame.
  • the respective phase 135 °, 225 ° and 315 ° is only used to determine the position within the super frame.
  • the further phase quadruples have as many 225 ° symbols as possible.
  • the 180 ° phase difference results in a clear assignment. The closer to the BCCH nesting frame, the more 225 ° symbols are used.
  • phase quadruples of an interleaving frame are evaluated.
  • a length of a superframe of 48 time frames, 12 nesting frames with 4 time frames each can be distinguished.
  • the minimum number of time frames to be detected for determining the position within a nesting frame is 1 to 3 in this embodiment.
  • the minimum number of time frames to be detected for determining the BCCH and the super frame is 3 to 4.
  • This method according to the invention is advantageous in addition to the advantages of the preceding methods already mentioned. ren the beginning of a nesting frame advantageously encoded directly. Furthermore, the time structure of the superframe is only signaled by four time frames. The order and the phase quadruple used can be optimized in such a way that a differential decoding of four or five successive DPTSs also enables the position within the superframe to be detected with large frequency offsets. If detection is carried out under poor transmission conditions, this embodiment enables reliable detection of the superframe.
  • the BCCH was therefore signaled by means of a synchronization channel SCH (synchronization channel).
  • SCH synchronization channel
  • an uncoded radio block of the logical channel is added with a status indicator f (flag), which can consist of one or more bits or symbols for differentiating the different logical channels.
  • flag a status indicator
  • the binary state of this status indicator f defines which logical channel it is.
  • Correct detection is achieved by the in-band signaling of the status indicator f described below in relation to FIG of the logical channel.
  • the method described above using the phase difference can thus be used without hesitation, since the correct channel for determining the phase difference is always referenced in the detection.
  • a radio block shows the expansion of a radio block according to the invention by a status indicator f.
  • the encoder forms a radio block with, for example, 184 bits or data symbols d.
  • an additional bit for the status indicator f is added to this radio block.
  • a CRC checksum (cyclic redundancy check) is added to the expanded radio block by block coding, and finally, in a fourth step 4, the radio block is convolutionally coded.
  • the status indicator f is thus protected twice for transmission via the radio interface and can be reliably detected.
  • a binary state of the status indicator f of 1 can, for example, identify the BCCH, during which the other logical channels are identified by the binary state 0.

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

Abstract

L'invention concerne un procédé permettant de signaler le début d'un canal logique dans un canal de transmission physique utilisé en commun d'un système de radiocommunication. Selon ce procédé, le début est signalé au moyen d'un rapport de phases entre le canal logique et un autre canal de transmission.
PCT/DE2001/001171 2000-03-27 2001-03-27 Procede pour signaler le debut d'un canal logique dans un canal de transmission physique utilise en commun d'un systeme de radiocommunication Ceased WO2001074021A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10015041A DE10015041C2 (de) 2000-03-27 2000-03-27 Verfahren zur Signalisierung des Beginns eines logischen Kanals in einem gemeinsam genutzten physikalischen Übertragungskanal eines Funk-Kommunikationssystems und Vorrichtung zur Durchführung des Verfahrens
DE10015041.1 2000-03-27

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WO2001074021A1 true WO2001074021A1 (fr) 2001-10-04

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KR (1) KR100524537B1 (fr)
CN (1) CN1163040C (fr)
DE (1) DE10015041C2 (fr)
WO (1) WO2001074021A1 (fr)

Cited By (1)

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US7069025B2 (en) 2000-11-14 2006-06-27 Symbol Technologies, Inc. Methods and apparatus for identifying asset location in communication networks

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
DE10057497A1 (de) * 2000-11-20 2002-05-29 Siemens Ag Verfahren zur Signalisierung der zeitlichen Positionierung ein oder mehrerer Broadcastkanäle in einem UMTS-Funkkommunikationssystem nach dem 1.28 Mcps-TDD-Mode sowie zugehöriges UMTS-Funkkommunikationssystem
US20030123426A1 (en) * 2001-12-31 2003-07-03 Bysted Tommy Kristensen Uplink access control
CN1783752B (zh) * 2004-12-02 2011-01-05 上海宣普实业有限公司 一种时分双工移动低码率(tdd-lcr)通信系统中获取广播信息位置的方法
CN1783751B (zh) * 2004-12-02 2011-10-19 上海宣普实业有限公司 一种时分双工-时分同步码分多址移动通信系统tdd-tsm中获取广播信息位置的方法
CN100450310C (zh) * 2006-06-01 2009-01-07 华为技术有限公司 一种缩短通信接通时间的实现方法

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GB2206768A (en) * 1987-06-30 1989-01-11 Zbyshek Gorzynski Data transmission by concurrent relative phase coding in multiple spectral carriers
DE19822276A1 (de) * 1998-05-18 1999-12-09 Siemens Ag Verfahren und Basisstation zur Signalübertragung in einem Organisationskanal eines Funk-Kommunikationssystems
WO2000010301A2 (fr) * 1998-08-11 2000-02-24 Telefonaktiebolaget Lm Ericsson (Publ) Conduction de signal a dephasage dans un systeme de communication numerique

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GB2206768A (en) * 1987-06-30 1989-01-11 Zbyshek Gorzynski Data transmission by concurrent relative phase coding in multiple spectral carriers
DE19822276A1 (de) * 1998-05-18 1999-12-09 Siemens Ag Verfahren und Basisstation zur Signalübertragung in einem Organisationskanal eines Funk-Kommunikationssystems
WO2000010301A2 (fr) * 1998-08-11 2000-02-24 Telefonaktiebolaget Lm Ericsson (Publ) Conduction de signal a dephasage dans un systeme de communication numerique

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Publication number Priority date Publication date Assignee Title
US7069025B2 (en) 2000-11-14 2006-06-27 Symbol Technologies, Inc. Methods and apparatus for identifying asset location in communication networks

Also Published As

Publication number Publication date
DE10015041A1 (de) 2001-10-18
DE10015041C2 (de) 2002-08-01
KR100524537B1 (ko) 2005-10-31
CN1419770A (zh) 2003-05-21
CN1163040C (zh) 2004-08-18
KR20020088407A (ko) 2002-11-27

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