WO2009045134A1 - Procédé de sélection d'une combinaison de formats de transport - Google Patents

Procédé de sélection d'une combinaison de formats de transport Download PDF

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Publication number
WO2009045134A1
WO2009045134A1 PCT/SE2007/050707 SE2007050707W WO2009045134A1 WO 2009045134 A1 WO2009045134 A1 WO 2009045134A1 SE 2007050707 W SE2007050707 W SE 2007050707W WO 2009045134 A1 WO2009045134 A1 WO 2009045134A1
Authority
WO
WIPO (PCT)
Prior art keywords
uplink transmission
transport format
tfc
uplink
format combination
Prior art date
Application number
PCT/SE2007/050707
Other languages
English (en)
Inventor
Jinhua Liu
Rong Hu
Qingyu Miao
Xinyu Gu
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/SE2007/050707 priority Critical patent/WO2009045134A1/fr
Publication of WO2009045134A1 publication Critical patent/WO2009045134A1/fr

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Classifications

    • 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
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter

Definitions

  • the present invention relates to a method and a device for selecting transport format combination in a cellular radio system.
  • WCDMA Wideband Code Division Multiple Access
  • E- DCH Enhanced Dedicated Channel
  • EUL High Speed Data Packet Access
  • the E-DCH shares several properties with the Data Channel (DCH) but in addition also supports several new features, such as: Short Transmission Time Interval (TTI) (2 ms TTI and 10 ms TTI) Fast Hybrid Automatic Repeat request (HARQ) with soft combining and fast scheduling.
  • TTI Short Transmission Time Interval
  • HARQ Hybrid Automatic Repeat request
  • Fast scheduling allows for rapid resource reallocation between UEs. thereby enabling exploitation of the burstiness in packet data transmissions. It also allows the system to admit a larger number of high data rate users and to rapidly adapt to interference variations, thereby leading to an increase in capacity as well as an increase in the likelihood that a user will be provided with high data rates.
  • the common resource shared among the terminals is the amount of tolerable interference, i.e.. the total received power at the base station.
  • Scheduling is the mechanism dete ⁇ nining when a certain terminal is allowed to transmit and at what maximum data rate.
  • the base station. Node B is provided with the tools to influence the User Equipment (UE) Transport Format Combination (TFC) selection for the E-DCH.
  • UE User Equipment
  • TFC Transport Format Combination
  • the scheduler sets the upper limit on the E-DCH data rate, it is the UE that is ultimately to make a decision to choose the actual data rate.
  • the principle for UE to choose the E-DCH Transport Format Combination E-TFC is schematically illustrated in figure 1.
  • the UE determines the E-TFC according to the available data to be transmitted , the scheduling grant and the power constraint.
  • logical channels mapped on the DCHs are always prioritized over those mapped on the E-DCH. This can be seen as if the TFC selection is performed in two steps. First the normal DCH TFC selection is performed according to the release 5 specifications. The UE then estimates the remaining power and a second TFC selection step is performed where E- DCH can use the remaining power.
  • the High Speed Dedicated Physical Control CHannel (HS-DPCCH) and the Enhanced Dedicated Physical Control CHannel (E-DPCCH) are p DPCCH i PD PDCH , ⁇ U S - DPCCH and P E -DPCCH respectively. Consequently, the available power for E-DPDCH is:
  • the UE can calculate the required transmitter power for different E-TFCs. Suppose the required Enhanced Dedicated
  • E-DPDCH Physical Data CHannel
  • Pedj is the power gain factor for E-TFCj. which is used to describe the power relationship between E-DPDCH and DPCCl 1 for a specific E-TFC.
  • the UE can calculate which E-TFCs that are possible to use from a power perspective. Hence, only the E-TFCs that require less power than the available E-DPDCH power are contemplated to be used. Thereafter, the UE selects the E-TFC by maximizing the amount of data that can be transmitted given the power constraint and the scheduling grant. In accordance with the current E-TFC selection algorithm the available data is placed in a transmitter buffer, the scheduling grant and UE transmitter power into account. Using the size of the transmission buffer, the scheduling grant and the UE transmitter power the E- TFC selection algorithm is then set to maximize the data rate. However, using the existing algorithm for E-TFC sometimes results in a too aggressive selection in relation to the current transmission environment.
  • E-TFC the power gain factor for each E-TFC.
  • 3GPP 25.214 a few of the E-TFCs are selected as reference E-TFC. and the E-DPDCH gain factor of these reference E-TFCs can be calculated from the signaled ⁇ E-DPDCH according to:
  • E-DPDCI I gain factors can be calculated with respect to a reference E-TFC as below:
  • L e rej - and L e j are the number of E-DPDCHs used for the reference E-TFC and the
  • ⁇ e . re / and K e j denote the transport block size of the reference E-TFC and the j:th E-TFC respectively.
  • the value ⁇ E-DPDCH is obtained from simulations, and its value depends on the HARQ configuration. For a delay optimized case, the value needs to be higher in order to finish the transmission successfully with less transmission attempts, e.g. only one transmission attempt. For capacity optimized case, however, more transmission attempts are desired so that the required transmission power can be lower to increase the capacity.
  • the gain factor for the other non-reference E-TFC calculated from the reference E-TFC may not be accurate.
  • the power gain factor is set lower than it should be. If these E-TFCs with lower power gain factor are selected by the UE for the transmission, they are aggressive compared to current channel condition , and will result in high probability of being NACKed. Then outer-loop power control can be triggered and the power of DPCCH will be increased to reach a proper power level of E-DPDCIl for this E-TFC. The power increase of the signaling channel is of course not a good solution because it ads to the interference of the overall system.
  • the UE can detect this and transmit using the same power but with a lower E-TFC.
  • the inaccuracy power offset can be compensate by this means to ensure the transmission efficiency.
  • uplink transmission feedback information is used to select Transmission Format Combination TFC. such as E-DCH Transmission Format Combination.
  • an E-TFC selection algorithm is adapted to include HARQ feedback information as input to select E-TFC.
  • the uplink feedback information can advantageously be used in addition other factors, e.g.., UE power limitation, scheduling grants and available data whereby a more accurate TFC/E TFC selection algorithm is obtained.
  • - Fig. 1 is a view illustrating selection of E-DCH Transport Format Combination.
  • - Fig. 2 is a view illustrating a simplified cellular radio system.
  • Fig. 3 is a view illustrating information transmitted on an uplink feedback channel
  • Fig. 4 is a flowchart illustrating steps performed when selecting Transport Format Combination.
  • the system 200 can for example be a WCDMA system.
  • the system 200 comprises a base station (Node B) 201.
  • the base station 201 serves a number of mobile stations, also termed User Equipment (UE) 203. located within the area covered by the base station 201 and or other base stations.
  • the base station 201 is also connected to a radio network controller node (RNC) 205.
  • RNC radio network controller node
  • the cellular radio system is a WCDMA system supporting HARQ such functionality is included in the base station 201 as indicated by the unit 209.
  • the mobile stations 203 are provided with a unit or device 207 for selecting Transport Format Combination and in particular in the case when the mobile station supports an EUL the device 207 is adapted to select E-DCH transport format combination.
  • EUL is fast hybrid ARQ. and the HARQ feedback information indicates whether the uplink transmission is correct or not. If the Node B receives the uplink transport block correctly, an ACK will be senl on the downlink E-DCH HARQ indication channel (E-HICH), otherwise a NACK will be sent. DTX will be sent in Soft I land Over SHO scenario for non-serving cells.
  • E-HICH E-DCH HARQ indication channel
  • E-TFC should be selected to avoid aggressive E-TFC selection.
  • An E-TFC back-off with certain step can be applied.
  • the transmit power may be kept at the same level as without back-off in order to fully benefit from the E-TFC back-off.
  • the HARQ feedback can be used with different ways in different conditions. For example. if there are enough samples of ACKs and NACKs received in a certain time period, the E- TFC back-off can be evaluated based on the NACK ratio. Alternatively, if there are not enough samples of ACKs and NACKs received in a certain time period, the E-TFC back-off can be based on the number of consecutively received NACKs.
  • the above two ways might also be used together.
  • the NACK/ACK ration may be used for a long term adjustment and the number of consecutive NACKs may be used for a short term adjustment.
  • S bu ff er are tne subset for the limitation of transmit power, scheduling grant and available data in buffer respectively.
  • ETFC ielecl is the selected E-TFC.
  • ETFC ⁇ elecl max(ETFC J e min(S ⁇ er , S ⁇ 0111 , S huffer )) (4)
  • R NACK N SACK / (N SACK + N ACK ) I f R NACK > ⁇
  • ETFC seka max(£7FC, e mm(S /mier ,S grml ,S b ⁇ r )) - back_qff ' _step (5) Else
  • N NACK is the consecutively received NACKs as illustrated in Fig. 3.
  • ETFC selecl max ⁇ ETFC j ⁇ mm(S power , S granl , S b ⁇ r )) - back _off _step
  • the back-off step can be a fixed value or an adaptive value corresponds to the NACK/DTX ratio or the number of consecutively received NACKs.
  • the transmit power should be kept the same as the power without applying back-off.
  • the original E-TFC without back-off is
  • ETFC original max(£TFC, e mm(S pmyer , S gran ⁇ , S h ⁇ r ))
  • the power offset of E-DPDCH should correspond to the original E-TFC instead of the selected E-TFC to truly benefit from the E- TFC back-off. Consequently, supposing ⁇ ed,ong i na i is the power gain factor for the original E-TFC.
  • the transmit power of E-DPDCH is:
  • the combined HARQ information can for example be set as that only if all received HARQ indications are NACK or DTX. the combined HARQ information is NACK, otherwise, even if only one ACK is received, the combined HARQ information is ACK.
  • Fig. 4 a flowchart illustrating some steps performed in a mobile station connected to a cellular radio system when selecting Transport Format Combination in accordance with an exemplary embodiment of the present invention is shown.
  • a step 401 an initial Transport Format Combination TFC is selected or, in the case E-TFC is employed an initial E-TFC is selected.
  • the initial TFC/E-TFC can for example be determined based on factors, such as UE power limitation, scheduling grants and available data.
  • the mobile station receives feedback information relating to the uplink and updates the statistics of the uplink HARQ feedback.
  • the information received may for example be ACKs or NACKs of a HARQ protocol received on the E-HICH channel or any other information related to the uplink.
  • the mobile station may select E-TFC next TTI in a step 405.
  • the TFC/E-TFC adjustment or re- selection may for example be performed as described hereinabove.
  • the TFC/E-TFC adjustment or re-selection procedure can then be continuously repeated as the mobile station receives updated information related to the uplink transmission feedback or if other transmission parameters changes such as UE power limitation, scheduling grants and available data.
  • one additional selection limit is applied to the UE E-TFC selection function, and more information about the transmission condition can be provided to the UE, therefore, the inaccuracy power gain factor can be compensated, which will result in more efficient uplink transmission and avoid the unnecessary power increasing of signaling channel.

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

Abstract

L'invention concerne un procédé et un dispositif de sélection d'une combinaison de formats de transport (TFC) destinés à une transmission en liaison montante dans un système radioélectrique cellulaire, le système fournissant des informations en retour de la transmission en liaison montante à une station mobile connectée au système radioélectrique cellulaire. La station mobile est conçue de façon à sélectionner une combinaison de formats de transport en réponse aux informations en retour de la transmission en liaison montante.
PCT/SE2007/050707 2007-10-04 2007-10-04 Procédé de sélection d'une combinaison de formats de transport WO2009045134A1 (fr)

Priority Applications (1)

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PCT/SE2007/050707 WO2009045134A1 (fr) 2007-10-04 2007-10-04 Procédé de sélection d'une combinaison de formats de transport

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PCT/SE2007/050707 WO2009045134A1 (fr) 2007-10-04 2007-10-04 Procédé de sélection d'une combinaison de formats de transport

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011026331A1 (fr) * 2009-09-02 2011-03-10 中兴通讯股份有限公司 Procédé et appareil de sélection de combinaison de formats de transport de canaux dédiés améliorée
TWI608755B (zh) * 2012-10-01 2017-12-11 Ｌｍ艾瑞克生（Ｐｕｂｌ）電話公司 無線電節點、使用者設備及傳輸管理方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030193913A1 (en) * 2002-04-10 2003-10-16 Shyuichi Murata Method of selecting transport format combination, and mobile terminal apparatus
WO2004068886A1 (fr) * 2003-01-29 2004-08-12 Siemens Aktiegesellschaft Choix de combinaison de format de transport (tfc) dans la liaison montante
US20050237932A1 (en) * 2004-04-23 2005-10-27 Jung-Tao Liu Method and system for rate-controlled mode wireless communications

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030193913A1 (en) * 2002-04-10 2003-10-16 Shyuichi Murata Method of selecting transport format combination, and mobile terminal apparatus
WO2004068886A1 (fr) * 2003-01-29 2004-08-12 Siemens Aktiegesellschaft Choix de combinaison de format de transport (tfc) dans la liaison montante
US20050237932A1 (en) * 2004-04-23 2005-10-27 Jung-Tao Liu Method and system for rate-controlled mode wireless communications

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011026331A1 (fr) * 2009-09-02 2011-03-10 中兴通讯股份有限公司 Procédé et appareil de sélection de combinaison de formats de transport de canaux dédiés améliorée
TWI608755B (zh) * 2012-10-01 2017-12-11 Ｌｍ艾瑞克生（Ｐｕｂｌ）電話公司 無線電節點、使用者設備及傳輸管理方法
US9876554B2 (en) 2012-10-01 2018-01-23 Telefonaktiebolaget Lm Ericsson (Publ) Radio node, a user equipment and methods for managing a transmission

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