WO2008125065A1 - Procédé de configuration, dispositif de nombre de symboles de commande, procédé et dispositif de mise à jour - Google Patents

Procédé de configuration, dispositif de nombre de symboles de commande, procédé et dispositif de mise à jour Download PDF

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Publication number
WO2008125065A1
WO2008125065A1 PCT/CN2008/070740 CN2008070740W WO2008125065A1 WO 2008125065 A1 WO2008125065 A1 WO 2008125065A1 CN 2008070740 W CN2008070740 W CN 2008070740W WO 2008125065 A1 WO2008125065 A1 WO 2008125065A1
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Prior art keywords
time slot
downlink
control symbols
slot
uplink
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PCT/CN2008/070740
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English (en)
Chinese (zh)
Inventor
Li Chen
Zhuo Gao
Guoqing Li
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Da Tang Mobile Communications Equipment Co., Ltd.
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Publication of WO2008125065A1 publication Critical patent/WO2008125065A1/fr

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    • 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]

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method, apparatus, and method and apparatus for controlling the number of control symbols.
  • control symbols are used to control resources such as associated channels and time slots.
  • LTE Long Term Evolution
  • OFDM Orthogonal Frequency Division Multiplexing
  • the main principle of OFDM technology is to convert high speed data streams through serial to parallel conversion to form multiple low speed data substreams for parallel transmission over multiple orthogonal subcarriers within a given channel.
  • the narrowband transmission is performed on each subcarrier, and the signal bandwidth is smaller than the corresponding channel bandwidth, which can greatly eliminate inter-symbol interference; the carriers (ie, subcarriers) of each subchannel are orthogonal to each other, and their frequency terms overlap each other, so High spectrum utilization.
  • LTE includes two multiplexing methods, Frequency Division Duplexing and Time Division Duplexing (TDD).
  • TTI Transmission Time Interval
  • Figure 1 The structure of a Transmission Time Interval (TTI) of the existing LTE FDD is shown in Figure 1.
  • TTI in LTE FDD consists of two subframes, including 14 symbols in the time domain.
  • the first m (m ⁇ 3) OFDM symbols are used as control symbols, and the first m symbols of all subcarriers are used as control symbols.
  • the specific number of control symbols is determined by the control signaling overhead, and the control signaling overhead is directly related to the size and type of resources that need to be controlled.
  • the more control signaling overhead is occupied by the scheduling signaling the more users and resources are scheduled, and the more TTIs are required, the greater the control signaling overhead.
  • the control signaling overhead required for the uplink scheduling is less than that required for the downlink scheduling.
  • the control symbols in each downlink TTI are determined to be the same number.
  • the control symbols in one downlink TTI fixedly schedule one downlink TTI and one uplink TTI, and the structure of each TTI in the LTE FDD is the same, so that the control symbols in each downlink TTI are determined to be the same.
  • the number can meet the structural requirements of FDD.
  • a radio frame consists of two sub-frames.
  • One subframe includes three special time slots and seven normal time slots (TS0 ⁇ TS6).
  • the three special time slots are Downlink Pilot Time Slot (DwPTS), Protection Interval (GP), and Uplink Pilot Time Slot (UpPTS).
  • DwPTS Downlink Pilot Time Slot
  • GP Protection Interval
  • UpPTS Uplink Pilot Time Slot
  • a TTI in a sub-frame contains a normal time slot of the type of uplink or downlink.
  • a time slot transition point exists between adjacent uplink time slots and downlink time slots.
  • the conversion point can be a downlink time slot to an uplink time slot.
  • Point UDSP
  • DUSP uplink time slot to downlink time slot conversion point
  • the subframes in LTE TDD use a certain slot allocation mode.
  • DUSP is after DwPTS
  • UDSP is after TS3.
  • one downlink time slot of the current subframe controls one subframe and/or multiple time slots of the current subframe or the next subframe, and the controlled time slot may be uplink or downlink.
  • the number and location of time slot switching points in an LTE TDD subframe may be various, and thus there are multiple time slot allocation modes, so different downlink time slots (TTIs) in the same subframe need to control time slots.
  • TTIs downlink time slots
  • the number or time slot type may be different, and accordingly the number of control symbols required in each downlink TTI is also different.
  • the method of determining the number of control symbols in the downlink TTI in the LTE FDD is still used in this case, that is, the control symbols in each downlink TTI are determined to be the same number, and obviously, the number of control symbols used may be more or less than
  • the number of symbols actually needed by the controlled time slot causes waste of resources or insufficient resources, and the transmission of scheduling information cannot be guaranteed when resources are insufficient.
  • Embodiments of the present invention provide a method, an apparatus, and an update method and apparatus for configuring a control number to implement configuration of a control symbol number.
  • an embodiment of the present invention provides a method, a device, and an update method and apparatus for controlling the number of symbols to be implemented as follows:
  • a method for configuring the number of control symbols includes: controlling the number of symbols; and, ';:'; , and ''':';:
  • the determined number of control symbols is configured as the number of control symbols in the time slot for scheduling.
  • the determining the number of control symbols is implemented in the following manner:
  • the number of control symbols in each downlink time slot is determined by the following manner:
  • each downlink time slot in the subframe is used for scheduling, and the downlink time slot to uplink time slot conversion point is located after the downlink pilot time slot, if the time slot 6 in the current subframe is scheduled in the current time slot and the next subframe Time slot 1 , the other downlink time slots in this subframe schedule the current time slot and the immediately following uplink time slot, and the mode in each downlink time slot is determined:
  • the uplink time slot to the downlink time slot switching point is after time slot 1, determining the number of control symbols of time slot 0 and time slot 2 to time slot 5 as the first number, and the number of control symbols of time slot 6 is the second number;
  • the uplink time slot to the downlink time slot conversion point is after time slot 2, and the number of control symbols of time slot 3 to time slot 5 is determined to be the first number, and the time slot 0 control time slot is the time slot and time slot 2, and the time slot is determined.
  • the number of control symbols of 0 and time slot 6 is the second number;
  • the uplink time slot to the downlink time slot conversion point is after time slot 3, and the number of control symbols of time slot 4 to time slot 5 is determined to be the first number, the number of control symbols of time slot 6 is the second number, and the time slot 0 controls the time slot.
  • the time slot 2 and the time slot 3 determining the number of control symbols of the time slot 0 is a third number;
  • the uplink time slot to the downlink time slot switching point is after time slot 4, and it is determined that the number of control symbols of the time slot 5 is controlled to be the first number, and the number of control symbols of the time slot 6 is the second number, and the time slot 0 controls the time slot.
  • the number of control symbols for determining time slot 0 is the fourth number;
  • the number of control symbols in the downlink time slot is determined according to the proportion of uplink and downlink time slots in the corresponding scheduled time slot.
  • the number of control symbols in the slot is according to the corresponding scheduled time.
  • the proportion of uplink and downlink time slots in the slot is determined by:
  • time slot 1 is an uplink time slot
  • the other 6 time slots are downlink time slots
  • the ratio of the uplink time slot to the downlink time slot is 1:6.
  • the number of control symbols required for slot 0 is the sixth number
  • time slot 1 to time slot 2 are uplink time slots, and the other 5 time slots are downlink time slots, and the ratio of uplink and downlink time slots is 2:5.
  • the number of control symbols required for slot 0 is the seventh number;
  • time slot 1 to time slot 3 are uplink time slots, and the other 4 time slots are downlink time slots, and the ratio of uplink time slots to downlink time slots is 3: 4. Determine the number of control symbols required for slot 0 to be the eighth number;
  • time slot 1 to time slot 4 are uplink time slots, and the other three time slots are downlink time slots, and the ratio of uplink time slots to downlink time slots is 4: 3. Determine the number of control symbols required for time slot 0 as the ninth number;
  • time slot 1 to time slot 5 are uplink time slots, and the other two time slots are downlink time slots, and the ratio of uplink time slots to downlink time slots is 5: 2. Determine the number of control symbols required for slot 0 to be the tenth number.
  • the first number to the tenth number are determined according to a format of the control signaling and a number of occupied bits.
  • a configuration device for controlling the number of symbols comprising: a control symbol number determining unit and a control symbol number configuration unit, wherein
  • the control symbol number determining unit determines the number of control symbols according to the number of scheduled time slots corresponding to the downlink time slot used for scheduling and the ratio of the uplink and downlink time slots;
  • control symbol number configuration unit configured to configure the number of control symbols determined by the control symbol number determining unit as the number of control symbols in the time slot for scheduling.
  • the method for updating the control symbol number determining unit according to a corresponding one of the number of control symbols when a downlink time slot is used for scheduling in a subframe includes: Determining, according to different numbers of downlink time slots used for scheduling, the corresponding number of scheduled time slots and the correspondence between the ratio of uplink and downlink time slots and the number of control symbols;
  • the correspondence stored in the query determines the number of control symbols used.
  • the correspondence may be stored as a table in the network side and/or in the terminal.
  • a control symbol number updating device comprising a correspondence relationship determining unit, a corresponding relationship storage unit, a control symbol number unit, a determining unit, a learning unit, wherein
  • Corresponding relationship determining unit determining, in a case where the downlink time slots used for scheduling are in different numbers, the corresponding number of scheduled time slots and the correspondence between the ratio of the uplink and downlink time slots and the number of control symbols;
  • Corresponding relationship storage unit configured to store the determined correspondence relationship in the network side and/or the terminal; determining a control symbol number unit, configured to perform scheduling according to the current scheduling mode, the number of scheduled time slots, and the ratio of uplink and downlink time slots Corresponding relationship stored by the correspondence relationship storage unit determines the number of control symbols used by the base station to transmit and/or the terminal to receive;
  • a determining unit configured to determine whether the current scheduling mode, the number of time slot switching points, and/or the location change
  • the learning unit is configured to: when the judging unit judges that the current scheduling mode, the number of time slot switching points, and/or the location changes, the scheduling mode, the number of time slot conversion points, and the location after the change are obtained, and the obtained result is obtained. Send to the unit that determines the control symbol number.
  • the number of control symbols is determined according to the number of scheduled downlink time slots for scheduling and the proportion of different types of time slots, and the number of control symbols in the downlink time slot is configured as The determined number of control symbols, such that the number of control symbols used is consistent with the number of symbols actually needed, to ensure the transmission of scheduling information, and to ensure the rational use of resources.
  • 1 is a schematic structural diagram of a transmission time interval of a frequency division multiplexing mode in an existing long-term evolution technology
  • 2 is a schematic structural diagram of a transmission time interval of a time division multiplexing mode in the existing long term evolution technology
  • FIG. 3 is a flowchart of an embodiment of a method for configuring a control symbol number according to the present invention
  • FIG. 5 is a schematic diagram of a scheduling mode used by a slot 0 for scheduling according to an embodiment of the present invention, which is divided into FIG. 5-1 to FIG. 5-5;
  • FIG. 6 is a block diagram of an embodiment of a control symbol number configuration apparatus according to the present invention.
  • FIG. 7 is a flowchart of an embodiment of a method for updating a control symbol number according to the present invention.
  • Figure 8 is a block diagram of an embodiment of a control symbol number updating apparatus of the present invention.
  • the embodiment of the present invention provides a method for configuring the number of control symbols.
  • the basic idea is to determine the number of control symbols according to the scheduling mode to be adopted, the number of time slots to be scheduled for each time slot, and the ratio of different types of time slots.
  • the number of control symbols in the configuration is configured as the determined number of control symbols.
  • FIG. 3 shows a flow chart of an embodiment of the method of the present invention.
  • the slot ratio determines the number of control symbols in the downlink time slot used for scheduling.
  • the scheduling mode adopted, the number of slots to be scheduled for each time slot, and the ratio of uplink and downlink time slots are different.
  • the scheduling mode is that each downlink time slot is used for scheduling, and the number of time slots that need to be scheduled for each downlink time slot may be different, and the number of control symbols in each downlink time slot may be different; for example, scheduling mode
  • the total number of time slots scheduled for the downlink time slot is the same, but the uplink and downlink ratio is uncertain, so the number of required control symbols may also be different. Therefore, it is necessary to determine the number of control symbols according to the number and type of control slots.
  • a TTI in LTE TDD contains a time slot, in which case the TTI mentioned in the present invention is identical to the time slot.
  • the following is an example in which the most common DUSP in the slot structure is located after the DwPTS, and only one UDSP is taken as an example.
  • the UDSP may be located at the end of one slot in TS1 ⁇ TS5, then
  • the time slots before TS 1 to UDSP are all uplink time slots, and the downlink time slots are from UDSP to TS6.
  • the UDSP may be located at the tail of one slot in TS1 ⁇ TS5, and the uplink slot may be one of five types: TS1, TS1 ⁇ TS2, TS1 ⁇ TS3, TS1 ⁇ TS4, TS1 ⁇ TS5, and TS0 and TS6 are fixed down.
  • the uplink slot there are five cases corresponding to the uplink and downlink time slot allocation. In different cases, the number of control symbols is different.
  • the scheduling mode may be that each downlink time slot is used for scheduling, or only one downlink time slot in one subframe is used for scheduling.
  • the number of control symbols is different in different scheduling modes. The following two cases are explained:
  • Figure 4 shows a schematic diagram of the slot control relationship in this case.
  • TS0 and TS2 ⁇ TS5 each control the time slot, and set the number of control symbols required to be ⁇ , that is, set to the first number;
  • TS6 controls TS1 of this time slot and the next subframe, that is, controls 2 time slots, where 1 One uplink time slot and one downlink time slot, and the number of control symbols required is m 2 , that is, the second number is set.
  • TS1 and TS2 in the subframe are uplink time slots.
  • TS0 controls the time slot and TS2, that is, controls one time slot, one of which is uplink and one downlink, which is the same as the number of slots and the number of types controlled by TS6, and the number of control symbols required is also the same, which is m 2 ;
  • TS3 ⁇ Each of TS5 controls this time slot, and the number of control symbols required is mi .
  • TS1 ⁇ TS3 in the sub-frame are uplink time slots.
  • TS6 controls the TS1 of this time slot and the next subframe, and the required number of control symbols is still m 2 ;
  • TS0 controls the time slot and TS2, TS3, that is, controls 3 time slots, one of which has 2 downlinks and 2 uplinks, and is set
  • the number of control symbols required is m 3 , that is, the third number is set;
  • TS4 ⁇ TS5 each control the time slot, and the number of control symbols required is m.
  • TS1 ⁇ TS4 in the sub-frame are uplink time slots.
  • TS6 controls the TS1 of this time slot and the next subframe, and the required number of control symbols is still m 2 ;
  • TS0 controls the time slot and TS2-TS4, that is, controls 4 time slots, one of which has 3 downlinks and 3 uplinks.
  • the number of control symbols required is m 4 , that is, the fourth number is set;
  • TS5 controls the time slot, and the number of control symbols required is rn ⁇
  • TS1 ⁇ TS5 in the sub-frame are uplink time slots.
  • TS6 controls the TS1 of this time slot and the next subframe, and the required number of control symbols is still m 2 ;
  • TS0 controls the time slot and TS2-TS5, that is, controls 5 time slots, one of which has 4 downlinks and 4 uplinks.
  • the number of control symbols required is m 5 , that is, the fifth number is set.
  • the number of time slots (number of control symbols) scheduled on each downlink time slot of different UDSP positions can be as follows:
  • the scheduling mode used is that only one downlink time slot is used for scheduling in a subframe
  • the total number of scheduled time slots is seven, but in the seven time slots scheduled with different switching point positions
  • the ratio of the uplink time slot to the downlink time slot is different, and the number of bits to be scheduled in the uplink time slot is smaller than the number of bits to be scheduled in the downlink time slot.
  • Fig. 5 shows a schematic diagram of the slot control relationship in this case, which is divided into Figs. 5-1 to 5-5. These diagrams are all cases in which TS0 in the subframe is used for scheduling.
  • TS0 schedules TS0 ⁇ TS6 in this sub-frame.
  • TS1 is the uplink time slot
  • the other six time slots are the downlink time slots.
  • the ratio of the uplink time slot to the downlink time slot is 1. : 6, which requires a set number of control symbols 6 m, i.e. the number of the sixth set.
  • TS0 schedules TS0 ⁇ TS6 in this sub-frame.
  • the two slots of TS1 and TS2 are uplink slots, and the other five slots are downlink slots, and uplink slots are used.
  • the ratio of the downlink time slots is 2:5, and the number of control symbols required is m 7 , that is, the seventh number is set.
  • TS0 schedules TS0 ⁇ TS6 in this sub-frame.
  • UDSP is located behind TS3
  • the three time slots of TS1 ⁇ TS3 are uplink time slots, the other four time slots are downlink time slots, and the ratio of uplink time slots to downlink time slots is 3: 4, and the number of control symbols required is m 8 , that is, For the eighth number.
  • TS0 schedules TS0 ⁇ TS6 in this sub-frame.
  • the four slots of TS1 ⁇ TS4 are uplink slots, and the other three slots are downlink slots, and the uplink slots are The ratio of the downlink time slots is 4:3, and the number of control symbols required is set to m 9 , that is, the ninth number is set.
  • TS0 schedules TS0 ⁇ TS6 in this sub-frame.
  • the five slots of TS1 ⁇ TS5 are uplink slots, and the other two slots are downlink slots, and the uplink slots are
  • the ratio of the downlink time slots is 5:2, and the number of control symbols required is m 1 () , that is, the tenth number is set.
  • the number of control symbols required for the time slot is similar to the above case, and is also determined by the proportion of uplink and downlink time slots scheduled.
  • the number of time slots scheduled on each downlink time slot of different UDSP positions (the number of control symbols in parentheses) can be as follows:
  • Table 2 Table of correspondence between UDSP position and scheduled uplink and downlink time slot ratio and control symbol number Table 1 and Table 2 above! ⁇ to m 1 () represents the number of control symbols, and the specific value thereof can be further determined by the specific format of the control signaling and the number of occupied bits.
  • Step 302 Configure the determined number of control symbols as the number of control symbols in the time slot for scheduling.
  • the number of control symbols sent is in accordance with the actual number of needs.
  • the method embodiment implements the configuration control symbol number.
  • the number of control symbols is determined according to the number of scheduled slots and the ratio of uplink and downlink slots corresponding to the downlink time slot used for scheduling, and the determined number of control symbols is configured as the downlink for scheduling.
  • the number of control symbols in the time slot so that the number of control symbols used is consistent with the number of symbols actually needed, to ensure the transmission of scheduling information, and to ensure the rational use of resources.
  • Figure 6 shows a block diagram of an embodiment of the apparatus.
  • the apparatus includes a control symbol number determining unit 601 and a control symbol number configuring unit 602, wherein
  • the control symbol number determining unit 601 determines the number of control symbols according to the number of scheduled time slots corresponding to the downlink time slot used for scheduling and the ratio of uplink and downlink time slots;
  • the control symbol number configuration unit 602 is connected to the control symbol number determining unit 601 for configuring the number of control symbols determined by the control symbol number determining unit 601 as the number of control symbols in the time slot for scheduling.
  • the control symbol number determining unit 601 is configured to schedule the number of control symbols in each downlink time slot in the subframe; the control symbol number determining unit 601 uses one downlink time slot in the subframe. number.
  • the specific determination example is similar to the case listed in the previous step 301, and is not mentioned here.
  • the number and location of time slot switching points can be notified to the terminal by broadcast and are generally fixed for a longer period of time.
  • the relationship table of the number of control symbols determined by the method described in the foregoing step 301 may be in the network side and the terminal. After the number and location of the slot change points are known, the downlink time slot may be obtained by checking the stored table. The number of control symbols is set, and the obtained number of control symbols is configured as the number of control symbols in the downlink slot. In this way, signaling interaction between the network side and the terminal is not required, and resources are saved.
  • Figure 7 shows a block diagram of an embodiment of the method. As shown in the figure, the following steps are included:
  • Step 701 Determine a correspondence between different scheduling modes, the number of scheduled time slots, and the ratio of uplink and downlink time slots to the number of control symbols.
  • Step 702 Store the determined correspondence.
  • the correspondence may be stored in the network side, may also be stored in the terminal, and may be used as a table.
  • Form storage such as shown in Tables 1 and 2 above.
  • Step 703 Determine, according to the current scheduling mode, the number of scheduled time slots and the uplink and downlink time slot ratios, determine the number of control symbols used by the base station to send and the terminal to receive by querying the stored correspondence.
  • Step 704 Determine whether the scheduling mode, the number of time slot conversion points and the location change, and if yes, go to step 705; if no, continue to step 704.
  • Step 705 After the base station and the terminal learn the scheduling mode, the number of slot switching points, and the location after the change, perform step 703.
  • the number of control symbols used for base station transmission and terminal reception can be flexibly determined according to the current scheduling mode, the number of scheduled time slots, and the uplink and downlink time slot ratios.
  • the method does not require signaling interaction between the network side and the terminal, thereby saving resources.
  • Figure 8 shows the device.
  • the apparatus includes a correspondence determining unit 801, a correspondence storage unit 802, a control symbol number unit 803, a determining unit 804, and a learning unit 805.
  • the correspondence determining unit 801 is configured to determine different scheduling modes, the number of scheduled time slots, and the correspondence between the uplink and downlink time slot ratios and the number of control symbols.
  • the correspondence relationship storage unit 802 is connected to the correspondence relationship determining unit 801 for storing the determined correspondence. For example, it can be stored in the network side and/or in the terminal.
  • the determining control symbol number unit 803 is connected to the corresponding relationship storage unit 802, and is configured to determine, according to the current scheduling mode, the number of scheduled time slots and the uplink and downlink time slot ratios, determine the base station to send by querying the corresponding relationship stored in the correspondence relationship storage unit 802. And/or the number of control symbols used by the terminal.
  • the determining unit 804 is configured to determine whether the current scheduling mode, the number of time slot switching points, and the location change.
  • the learning unit 805 is connected to the determining unit 804 and the determining control symbol number unit 803, and is configured to learn the scheduling mode, the number of slot switching points, and the position after the change, and send the obtained result to the determining control symbol number unit 803. .
  • the method for implementing the number of configuration control symbols by using the apparatus of the present invention is similar to the method described in the foregoing steps 701 to 705, and will not be described here.

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Abstract

La présente invention concerne un procédé de configuration d'un nombre de symboles de commande. À cet effet, on commence par déterminer le nombre de symboles de commande sur la base, d'une part des tranches de temps ordonnancées correspondant aux tranches de temps d'arrêt utilisées pour l'ordonnancement, et d'autre part du rapport entre tranches de temps de fonctionnement et tranches de temps d'arrêt. Ensuite, on configure le nombre de symboles de commande ainsi déterminé, et on s'en sert comme nombre de symboles de commande dans la tranche de temps utilisée pour l'ordonnancement. Quand la totalité des tranches de temps de la sous-trame est utilisée pour l'ordonnancement, pour déterminer le nombre de symboles de commande dans chaque tranche de temps d'arrêt, on se base sur le nombre correspondant de tranches de temps ordonnancées et le rapport entre tranches de temps de fonctionnement et tranches de temps d'arrêt. Quand une tranche de temps d'arrêt de la sous-trame est utilisée pour l'ordonnancement, pour calculer le nombre de symboles de commande dans cette tranche de temps d'arrêt, on se base sur le rapport entre tranches de temps de fonctionnement et tranches de temps d'arrêt dans la tranche de temps ordonnancée correspondante. L'invention concerne également un dispositif de configuration du nombre de symboles de commande, un procédé de mise à jour, et un dispositif de nombre de symboles de commande.
PCT/CN2008/070740 2007-04-17 2008-04-17 Procédé de configuration, dispositif de nombre de symboles de commande, procédé et dispositif de mise à jour WO2008125065A1 (fr)

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KR20050083085A (ko) * 2004-02-21 2005-08-25 삼성전자주식회사 직교 주파수 분할 다중 접속 방식의 이동 통신 시스템에서트래픽 데이터 스케줄링 장치 및 방법
WO2005096532A1 (fr) * 2004-03-31 2005-10-13 Nortel Networks Limited Programmation adaptative de trafic vocal dans un environnement de communication a porteuses multiples

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