EP1266532A1 - Procede de distribution des ressources dans un systeme de radiocommunication - Google Patents

Procede de distribution des ressources dans un systeme de radiocommunication

Info

Publication number
EP1266532A1
EP1266532A1 EP01923533A EP01923533A EP1266532A1 EP 1266532 A1 EP1266532 A1 EP 1266532A1 EP 01923533 A EP01923533 A EP 01923533A EP 01923533 A EP01923533 A EP 01923533A EP 1266532 A1 EP1266532 A1 EP 1266532A1
Authority
EP
European Patent Office
Prior art keywords
resources
data
transmission
network
data sources
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.)
Withdrawn
Application number
EP01923533A
Other languages
German (de)
English (en)
Inventor
Jean-Michel Traynard
Christian Menzel
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP1266532A1 publication Critical patent/EP1266532A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the invention relates to a method for resource allocation in a radio communication system, in particular a mobile radio system, and a radio communication system designed in this way, resources of the radio interface being formed by channels which are used by the network for several connections of and to subscriber stations are made available and differ in the time position and their signal form only in a given frequency scan, and in which pauses in data transmissions further data transmissions are carried out.
  • Radio communication systems enable communication connections to be established between mobile or fixed subscriber stations and a base station in the network by sending data in both directions over the radio interface.
  • frequency division duplexers Frequency Division Duplex FDD
  • time division duplex Time Division Duplex TDD
  • Multiple access methods are used to distinguish between several simultaneous connections between individual subscribers If several subscribers on the same carrier frequency are separated on the radio interface by different time slots, a time division multiplex procedure (Tii ⁇ e Division Multiple
  • Code Division Multiple Access TDMA Time-division multiplexing
  • other methods for separating subscribers can be used on the radio interface, such as code division multiplex (Code Division Multiple Access CDMA), in which the signal signals are used for the purpose of unambiguously assigning clean separation spread different orthogonal code sequences over the entire bandwidth AVAILABLE under coding gain ⁇ to.
  • code division multiplex Code Division Multiple Access CDMA
  • CDMA Code Division Multiple Access
  • TD-CDMA-Ver nrens is the Time Division-Synchron Code Division Multiple Access (TD-SCDMA " 1 method, which, like the TD-CDMA method, can serve as an example for the use of the invention without the generality of the TD-SCDMA method.
  • the TD-SCDMA method differs from the pure TD-CDMA method, inter alia, by using a precise synchronization of the received signals in the uplink, which improves the detection properties of the received signals.
  • non-real-time data transmissions are, for example, typical Internet traffic such as WWW (World Wide Web), FTP (File Transfer Protocol), e-mail or SMS (Short Message Service). They are based on a packet-oriented transmission of data, which is also subdivided on the time axis, but not primarily in fixed time slots, but in addressed data packets of variable length.
  • the transmission of such data packets and the signaling of the application layer contained therein can be carried out on the radio interface effectively be realized by short, the respective data packet size at ⁇ fitted resource assignments because supply breaks-acres each data packets generally longer Ubertra- occur. Longer delays, for example, 400 ms to several seconds, for example, by non Availability at and the consequent delay in the ⁇ transmission of data packets due are in Xicht-Ecr.t- time data is unkntiscn.
  • Real-time ubertragonne are usually realized by ln ⁇ gere exclusive allocation of a resource per connection, although with them Ubertragungspa sen by however much k rzerer time, for example as a result of using egg nes VAD (Voice actvity Detector) for switching off the transmitter during pauses or fluctuations in the data rate.
  • VAD egg actvity Detector
  • the reason for this resource allocation are the strict delay requirements of, for example, less than 40 ms. / Oak from the usual resource allocation methods, which cannot always be met after a short pause in transmission.
  • TD-CDMA Time Division Multiple Access
  • GSM Global System for Mobile Communications
  • resource is to be understood as the transmission capacity which is necessary for a verbm ⁇ mg is required in general m UMTS by the triple
  • Frequency, time slot and code is characterized.
  • m UMTS is needed, for example, only ei ⁇ nen physical channel, ie, a time slot and a spreading code within a frequency band.
  • ei ⁇ nen physical channel ie, a time slot and a spreading code within a frequency band.
  • you need eight physical channels i.e. a time slot with eight spreading codes.
  • the resource can also be divided into several time slots, for example it can be divided into two for a 64 kbit / s data service for which four physical channels are required
  • Spreading codes can be distributed on ⁇ em one and two spreading codes on another time slot.
  • the pooling of several individual resources into one larger transmission resource is called channel pooling.
  • Each time slot can be assigned to the Uplmk or Downlmk.
  • a radio communication system can also be limited by the number of allocated resources. This applies, for example, to subscribers who are integrated in Circuit Switched (CS) applications.
  • the network exclusively assigns as many dedicated channels (DCH) to each connection as is required for the transmission of the peak value of the data rate of real-time services. Allocating fixed resources is optimal if the real-time application uses the available bandwidth at all times. at c
  • the multiple access scheme In order to keep the collisions or the loss of user data to an acceptable minimum, the multiple access scheme must be designed with a lot of redundancy and security. In a TD-CDMA system this means, for example, that although 16 codes are available per time slot, only a maximum of 8 of these codes at the same time can be awarded. If more codes were assigned, this would lead to an unacceptable increase in interference in the case of voice connections in the times when all transmissions happen to be active at the same time. However, due to pauses in speech, not all 8 codes are used most of the time. This and the maximum number of codes used simultaneously for dedicated channels for this "worst case" result in unused resources. This effect of soft capacity limitation described here and its consequences can also be observed in other CDMA systems.
  • the invention is based on the object of specifying a method according to which, in times of non-optimal utilization of a TD-CDMA system or a comparable radio communication system, by data polling via dedicated channels, additional data from other applications are transmitted with a low signaling effort and possible mutual disturbances and the transmission capacity of the radio interface can be optimally used.
  • a data source using an allocated channel indicates the end of the transmission break after each transmission break mC within a data transmission of the resource management of the network and then accesses its dedicated channel without delay. 5
  • a reduction in the complexity of the signaling is achieved by not using the unused resources of the data sources using data channels, but instead not using them as dedicated channels ⁇ er-C due to the soft capacity limitation to other data sources willing to send from the network Resources are allocated.
  • the resources already allocated as dedicated channels remain exclusively allocated to these data sources. This means that when this activity resumes, there will be no collision with other data sources on this pessource.
  • at least as many additional resources can be located as there are simultaneous data sources using inactive, dedicated channels.
  • PUSCH PUSCH resources are sent, which are valid for the next transmission period.
  • the necessary addressing of the PUSCH resources is communicated to the additional data sources willing to send by suitable signaling. As soon as a data source in the UCCH that is willing to send has received its USF in connection with one or more PUSCH resources, it is allowed to use this / these PUSCH resources during the next transmission period. 'send.
  • Another embodiment provides for the number of PU3CH
  • the beginning of transmission pauses in data transmissions using dedicated channels can be transmitted to the network as inband signaling from the data sources using the dedicated channels.
  • the ends of transmission pauses using data channels using dedicated channels can be signaled to the network on a separate signaling channel, such as the Fast Uplmk Access Channel FUACH, by the data channels using dedicated channels.
  • a separate signaling channel such as the Fast Uplmk Access Channel FUACH
  • a (first) interference level can be defined as a threshold for radio cells, the undershoot of which pauses in data transmissions into the dedicated channel. signals that are assigned by the network for other data transmissions.
  • an interference level lower than the first interference level can be defined as the threshold value for radio cells, if the threshold is undershot for a certain period of time, the network assigns further (P) USCH resources to other data transmissions without signaling via the beginning of a transmission break of a data transmission in the dedicated channels.
  • Resources are allocated and, after these resources have been exhausted, the resources of the currently inactive applications are allocated on the dedicated channels.
  • Fig. 2 is a schematic representation of the radio interface between subscriber stations and base stations of the
  • FIG. 3 shows a schematic illustration of transmission resources allocated according to the invention in the upward direction, viewed over several time slots within a TDMA frame, and
  • FIG. 4 shows a schematic representation of resources allocated according to the invention within a time slot, viewed over several TDMA frames.
  • the radio communication system shown in FIG. 1 and exemplarily configured as a mobile radio network consists of interlinked mobile switching devices MSC / SGSN, which at the same time have access to fixed networks such as PSTN, ISDN and IP network produce. You are at least with one facility each
  • RNC connected, each access to at least one of Ba ⁇ sisstation Node B. manufactures and shear for allocating resources funktechni ⁇ is responsible.
  • Each base station Node B can establish connections V from un ⁇ to a large number of subscriber stations UE via a radio interface, some of which are shown as examples.
  • Each base station node B_ forms at least one radio cell Z, which is combined with other radio cells to form a logical group of radio cells within the cellular mobile radio system.
  • a number of logical channels are defined for each frequency, time and spreading code selective physical channel, which are mapped onto the physical channels. They are identified by a specific parameter group.
  • User information such as voice and data are sent for circuit-switched and packet-oriented applications via log_- see user channels (Traffic Channel TCH).
  • Signaling information is transmitted via logical signaling channels (Control Channel CCH.
  • the signaling channels are also used for bit and TDMA frame synchronization and possibly for packet-oriented data transmissions such as short message services (SMS, CBS).
  • logical user channels ICH are set up in the known manner for undelayed transmission.
  • the subscriber station UE of the radio cell Z sends RT data in the upward direction to the base station Node B.
  • the subscriber station UE. can be characterized as an RT source in this case.
  • Em logical user channel DCH can consist of one or more physical individual resources and is very variable for the maximum values. data rates. In this mgische Nutzkanal
  • time-critical data is not delayed by a transmission of non-time-critical iNon Real Time NRT) data or time-critical data from other data sources (UE UE.).
  • the beginning and end of pauses within RT data transmissions are signaled with suitable means "on the RT source UE of the base station Node B.
  • the pause beginning curch be a Indand-Si- gnalmaschine communicated in the assigned logical N ⁇ tzkanal DCH.
  • m the data blocks (bursts, m the information to be transmitted are classified after pretreatment to increase transmission security, special signaling information on the source side m the signaling component S (see FIG. 2) of a data block and received on the receiving side from the signaling component read.
  • the signaling for the end of the break can, according to a further embodiment of the invention, as symbolically represented in FIG. 1, by means of the subscriber-specific, dedicated
  • a base station Node B can also determine the beginning and end of the break at the measured interference level m of the radio cell Z.
  • NRT data source UE F or other data transmissions, preferably NRT ubertragonne, but also possibly RT ubertragungen data sources ⁇ UE UE, the invention can also be used resources that are not loading after an advantageous form already on dedicated Nutzkanalen DCH other Data sources have been assigned. According to the invention, these resources form the logical user channel Uplmk Shared Channel USCH.
  • the referral to ⁇ a connection to the physical resource USCH-cen PUSCH is performed m one embodiment of the invention via a further signaling channel, the control channel Uplmk UCCH means of a Uplmk State Flags USF. Flags carry signaling information in a known manner within a data block to distinguish between voice and data transmissions. They will continue to be used to transfer control information to packet-oriented data services.
  • assignments between PUSCH resources and USFs are sent per transmission period, which corresponds to the rule of the scrambling duration for real-time connections, ie 20 ms, which are valid for the next transmission period.
  • the data sources UE UE according to FIG. 1 know the necessary addressing of the PUSCH resources for this by suitable means. For example, these are specified in the standard or are continuously "broadcast" by the base station Node B.
  • the addressing of the PUSCH reserves can also take place when the USCH mode is transferred to the data sources UE, UE. be communicated.
  • the NRT data source UE finds its USF in the UCCH with a connection to one or more PUSCH resources, it knows that it can send m this and only this PUSCH resource / s during the next transmission period , If your USF is not included, you may not send.
  • the number of PUSCH resource for which per Ubertragungs ⁇ period USFs are assigned in UCCH is determined by the base station Node-B. It depends on the one hand on the activities of the data sources on the dedicated channels, which is known to the base station Node B via the corresponding in and outband signaling, and on the other hand according to the interference level m of the radio cell Z measured by the base station Node B.
  • the base station Node B must assume that e.g. B. some outband signaling of a data source sending on a dedicated channel regarding the "end of a transmission pause" was not received, these data sources UE started to send again and thus fewer PUSCH resources are available.
  • FIG. 2 An exemplary frame structure of the radio interface of a TDD transmission operator is shown in FIG. 2. After that, a total transmission bandwidth of z. B. 20 MHz m 4 sub-frequency band Bl .. B4 divided with a bandwidth of 5 MHz. Some or all sub-frequency bands B are appropriately assigned to each radio cell. This is the FDMA component of the hybrid multiple access procedure TD-CDMA. Within each sub-frequency band B there is also a division of the time axis m TDMA frame Tr according to a TDMA component. r3r _ constant length, for example 10 ms, instead, which in turn is divided into, for example, 16 time slots TS1 to TS16 of likewise the same length of time, for example 625 ⁇ s, with increasing numbers.
  • r3r _ constant length, for example 10 ms, instead, which in turn is divided into, for example, 16 time slots TS1 to TS16 of likewise the same length of time, for example 625 ⁇ s, with increasing
  • the numbering is repeated in each TDMA frame.
  • e and the same time slot number TS1 to TS16 can be assigned to a subscriber station periodically in the TDMA frame interval of 10 ms.
  • time slot hop There is also the possibility of periodically changing the time slots TS according to a certain scheme (time slot hop).
  • Each radio cell has several Ze_.t- slots allocated TS. Part of these time slots TS is used for the downlink DL from a base station to a subscriber station and part for the uplink UL. In between is a switchover point SP, which can be variably administered between the various asymmetrical distribution of the transmission resources.
  • a communication link are each assigned one or meh ⁇ eral individual resources dynamically, in order to realize connections with different data rates or sev- eral services to operate in parallel on a link.
  • ⁇ ner of the time slots TS data blocks ⁇ bursts) are transmitted, containing in the case of normal bursts for Nutzkanale a data part D, a signaling component S and a training sequence T for channel estimation.
  • the information of several connections is transmitted in a time slot TS, in that each time slot TS is spread again with a subscriber code sequence for each connection.
  • the spreading of individual data symbols of the data D to be transmitted, in which training sequences T known at the receiving end are embedded, has the effect that within the symbol duration T- - Q data chips D chips of the duration T. be transmitted.
  • the Q data chips form the connection-specific subscriber code. 16 spreading cooes C1 to C16 are available for each time slot TS (full slot).
  • Emzel resource as the smallest unit for the transmission of useful and signaling information.
  • FIG. 3 An allocation of pesources to time slots and codes within a TDMA frame is shown as an example in FIG. 3.
  • a TDMA frame n + 1 is selected.
  • fen. According to the IC. Slitting time slot of its total of 16 time is the switching point SP between the Abwarts ⁇ distance DL and UL Aufwartsumble adopted. Due to the CDMA component, each time slot can be occupied by up to 8 out of 16 individual resources (codes) at the same time.
  • the RT data source UE from FIG. 1 sends real-time data
  • the code 4 in time slot 11 of the TDMA frame structure is assigned exclusively by the base station Neue B as a resource.
  • the transmission takes place on the logical user channel DCH.
  • the resource remains reserved for the RT data source UE even during pauses in speech.
  • a further data source UE_ receives a transmission resource on the DCH from the base station Node B, for the transmission thereof, in the example in the time slot 13 the codes 1 to 4 and in the time slot 14 the codes 1, 3, 5 and 8.
  • it is an NRT data transmission in the 128 kbit / s data service.
  • the resource for the further data source UE thus lies on freely available codes and does not access the code 4 in the time slot 11 that is exclusively assigned to the RT data source UE even during transmission pauses of the RT application of UE. This is also the case if other codes and / or time slots are assigned to the further data source UE ⁇ by the resource management in the course of the NRT transmission.
  • the further data source UE_ could of course also be an RT data source and could manage with one or two codes - depending on the quality of the connection - in a time slot.
  • an NRT data source UE requests a connection from the base station Node B1.
  • Your ⁇ pursuant to another aspect of the invention PUSCH Res ⁇ resources allocated on the USCH.
  • the "unused" codes 15 and 16 m are assigned to time slots 13 and 15, with which a 64 kbit / s data service can be implemented. In this way are collisions with eg the RT data ⁇ closed source UE and the NRT data source UE effectively out ⁇ .
  • NRT data source UE were assigned codes 1 to 4 on the time slot 11 for the time of the transmission pauses from the RT data source UE, for example using a method according to the prior art.
  • another NRT data source are UE. the codes 13 and 14 assigned to the time slot 13.
  • FIG. 4 schematically shows the allocation of resources within an exemplary time slot TS13 over several TDMA frames n, n + 1, .... n + 3 to the data sources UE , UE, UE and UE. shown.
  • the number of resources available in the Uplmk Shared Channel USCH directly from the number of resources active as dedicated channels DCH per TDMA frame, or also a group of TDMA frames, e.g. B. depends on two or four TDMA frames.
  • the maximum permitted number of resources used per time slot TS13 is assumed to be 8 in the example.
  • the data sources UE, UE using the dedicated channels DCH wait until the corresponding number of uplink shared channel (USCH) resources is no longer used. Therefore, no more than 8 resources are used at the same time. If the data sources UE, UE, which use the dedicated channels DCH, were not maintained, under certain circumstances more than 8 resources could be used simultaneously during the allocation period. For example, this could be the case when moving from TDMA frame n + 2 on the TDMA frame n + 3, provided that the data source UE_ is already sending in the TDMA frame n + 2 instead of waiting until the TDMA frame n + 3.
  • the Uplmk Shared Channel USCH thus contains all resources that are not used as dedicated channels DCHs.
  • the number of resources actually used for the USCH transmission results from the transmission pauses on the dedicated channels DCHs.

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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 de distribution des ressources dans un système de radiocommunication, en particulier dans un système de téléphonie mobile, dans lequel les ressources sont mises à disposition en accès multiple et diffèrent en matière d'intervalle de temps et de forme de signal. Dans ce système, lors de pauses de transmissions de données, pour lesquelles sont réservés des canaux dédiés, d'autres transmissions de données sont effectuées. Selon ledit procédé, les ressources qui ne sont pas déjà attribuées à des sources de données en tant que canaux dédiés sont attribuées à d'autres sources de données en liaison ascendante.
EP01923533A 2000-03-23 2001-03-23 Procede de distribution des ressources dans un systeme de radiocommunication Withdrawn EP1266532A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10014396 2000-03-23
DE2000114396 DE10014396C2 (de) 2000-03-23 2000-03-23 Verfahren zur Ressourcenzuteilung in einem Funk-Kommunikationssystem und Funk-Kommunikationssystem zum Durchführen des Verfahrens
PCT/DE2001/001139 WO2001072061A1 (fr) 2000-03-23 2001-03-23 Procede de distribution des ressources dans un systeme de radiocommunication

Publications (1)

Publication Number Publication Date
EP1266532A1 true EP1266532A1 (fr) 2002-12-18

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Application Number Title Priority Date Filing Date
EP01923533A Withdrawn EP1266532A1 (fr) 2000-03-23 2001-03-23 Procede de distribution des ressources dans un systeme de radiocommunication

Country Status (4)

Country Link
EP (1) EP1266532A1 (fr)
CN (1) CN1419789A (fr)
DE (1) DE10014396C2 (fr)
WO (1) WO2001072061A1 (fr)

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CN1419789A (zh) 2003-05-21
WO2001072061A1 (fr) 2001-09-27
DE10014396A1 (de) 2001-10-04
DE10014396C2 (de) 2002-10-24

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