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WO2011098010A1 - Procédé et dispositif pour déterminer l'espace de recherche d'un canal de contrôle de liaison descendante physique (pdcch) - Google Patents

Procédé et dispositif pour déterminer l'espace de recherche d'un canal de contrôle de liaison descendante physique (pdcch) Download PDF

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Publication number
WO2011098010A1
WO2011098010A1 PCT/CN2011/070800 CN2011070800W WO2011098010A1 WO 2011098010 A1 WO2011098010 A1 WO 2011098010A1 CN 2011070800 W CN2011070800 W CN 2011070800W WO 2011098010 A1 WO2011098010 A1 WO 2011098010A1
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WIPO (PCT)
Prior art keywords
terminal
search space
determining
identifier
physical downlink
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PCT/CN2011/070800
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English (en)
Chinese (zh)
Inventor
阳建军
高秀娟
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华为技术有限公司
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Publication date
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Publication of WO2011098010A1 publication Critical patent/WO2011098010A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for determining a physical downlink control channel search space.
  • a base station In a Long Term Evolution (LTE) system, a base station indicates, by using a Physical Downlink Control Channel (PDCCH), a location where a base station transmits a downlink data resource to a terminal, and a location where the terminal sends an uplink data resource to the base station, and Scheduling information, etc.
  • PDCCH Physical Downlink Control Channel
  • the physical resources transmitted by the PDCCH are in units of Control Channel Element (CCE), that is, 36 Resource Elements.
  • CCE Control Channel Element
  • a PDCCH may occupy 1, 2, 4 or 8 CCEs, that is, the PDCCH has four Aggregation Levels of 1, 2, 4 and 8.
  • Each aggregation level defines a search space, including a common PDCCH search space and a terminal's proprietary PDCCH search space.
  • C-RNTIs cell radio network Temporary Identifiers
  • Embodiments of the present invention provide a method and apparatus for determining a physical downlink control channel search space.
  • the data transmission efficiency between the base station and the terminal is improved.
  • a method for determining a physical downlink control channel search space including: transmitting, to a terminal, indication information that carries a new identifier of the terminal, where the indication information is used to instruct the terminal to determine, according to the new identifier, A private physical downlink control channel search space of the terminal; after receiving the acknowledgement information, determining a dedicated physical downlink control channel search space of the terminal according to the new identifier of the terminal.
  • another method for determining a physical downlink control channel search space including: receiving, by the base station, indication information that carries a new identifier of the terminal, where the indication information is used to indicate that the terminal is configured according to the new identifier. Determining a private physical downlink control channel search space of the terminal;
  • an apparatus for determining a physical downlink control channel search space including: a transceiver module, configured to send, to a terminal, indication information that carries a new identifier of the terminal, where the indication information is used to indicate that the terminal is Determining a new identifier, determining a specific physical downlink control channel search space of the terminal, and sending a new identifier of the terminal to the terminal, and receiving confirmation information sent by the terminal according to the indication information;
  • a determining module configured to determine, according to the new identifier of the terminal, the dedicated physical downlink control channel search space of the terminal, after the transceiver module receives the acknowledgement information sent by the terminal.
  • a terminal including:
  • a transceiver module configured to receive, by the base station, indication information that carries a new identifier of the terminal, where the indication information is used to indicate that the terminal determines a dedicated physical downlink control channel search space according to the new identifier, and is used for Sending confirmation information to the base station according to the received indication information;
  • a determining module configured to determine, after the sending and receiving module sends the acknowledgement information to the base station, a dedicated physical downlink control channel search space of the terminal.
  • a method and a device for determining a physical downlink control channel search space are provided by the embodiment of the present invention.
  • a method for determining a physical downlink control channel search space including: acquiring dynamic information related to a terminal and changing with time, where the dynamic information is a product of a system frame number and an identifier of the terminal, Or a pseudo-random number generated by a pre-agreed random seed and pseudo-random number generation method;
  • another apparatus for determining a physical downlink control channel search space including: an acquiring module, configured to acquire dynamic information related to a terminal and change with time; the dynamic information is a system frame number and the terminal The product of the identifier, or a pseudo-random number generated by a predetermined random seed and pseudo-random number generation method;
  • a determining module configured to determine, according to the dynamic information acquired by the acquiring module, and the identifier of the terminal, a dedicated physical downlink control channel search space of the terminal.
  • the time-dependent dynamic information related to the terminal and the identifier of the terminal are jointly used as parameters for determining a terminal-specific PDCCH search space
  • the dynamic information is related to the terminal and changes with time.
  • the probability that the dynamic information is the same for different terminals is extremely small, and the probability of collision of the terminal-specific PDCCH search space determined according to the dynamic information is also extremely small.
  • FIG. 1 is a flow chart of an embodiment of a method for determining a physical downlink control channel search space according to the present invention
  • 2a is a flow chart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention
  • 2b is a schematic diagram of a data structure of a MAC data packet in an embodiment of a method for determining a physical downlink control channel search space according to the present invention
  • FIG. 3 is a flow chart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention.
  • FIG. 4 is a flow chart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention.
  • FIG. 5 is a flow chart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention.
  • FIG. 6 is a flow chart of another method for determining a physical downlink control channel search space according to the present invention.
  • FIG. 7 is a flow chart of another method for determining a physical downlink control channel search space according to the present invention.
  • FIG. 8 is a flow chart of another method for determining a physical downlink control channel search space according to the present invention.
  • FIG. 9 is a flow chart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention.
  • 10 is a schematic structural diagram of an apparatus for determining a physical downlink control channel search space according to the present invention
  • 11 is a schematic structural diagram of another apparatus for determining a physical downlink control channel search space according to the present invention.
  • FIG. 12 is a schematic structural diagram of a terminal embodiment of the present invention.
  • FIG. 13 is another schematic structural diagram of a terminal embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram of another apparatus for determining a physical downlink control channel search space according to the present invention.
  • FIG. 15 is a schematic structural diagram of another apparatus for determining a physical downlink control channel search space according to the present invention. detailed description
  • the base station Before the base station sends the PDCCH to the terminal, the base station sends the C-RNTI of the terminal to the Cyclic Redundancy Check (CRC) of the PDCCH, and according to the method for determining the PDCCH search space, Obtaining a starting point of the terminal's proprietary PDCCH search space, and placing the PDCCH in a certain available location in the search space of the starting point.
  • CRC Cyclic Redundancy Check
  • the terminal in the connected state calculates its own proprietary PDCCH search space for each subframe.
  • the terminal determines the starting point of the proprietary PDCCH search space according to its own C-RNTI.
  • Embodiments of the present invention relate to a method for determining a proprietary PDCCH search space of a terminal.
  • FIG. 1 is a flow chart of an embodiment of a method for determining a physical downlink control channel search space according to the present invention.
  • a method for determining a PDCCH search space is mainly described from a base station perspective. As shown in FIG. 1, this embodiment includes:
  • the indication information indicating that the terminal determines the terminal's proprietary PDCCH search space according to the new identifier may be sent to the terminal at each layer of the radio interface protocol, for example, a data link layer, a physical layer, or a network layer.
  • the terminal After receiving the indication information sent by the base station, the terminal returns an acknowledgement information to the base station according to the indication information.
  • the base station receives the acknowledgement information, it indicates that the new identity of the terminal is valid.
  • the base station After receiving the acknowledgment information sent by the terminal, the base station re-determines the terminal-specific PDCCH search space according to the new identifier of the terminal, and places the PDCCH command sent by the terminal in an available location in the search space for the terminal to Obtained in this search space.
  • the base station determines, according to the new identifier of the terminal, a starting point of the terminal's private PDCCH search space, and starts from the starting point, and blindly checks 1, 2, 4, or 8 (depending on the aggregation level of the PDCCH) consecutive CCEs. Whether it is idle, if idle, the PDCCH is placed at the location of the idle CCE.
  • a PDCCH of one CCE may start from an arbitrary CCE position; a PDCCH of two CCEs starts from an even CCE position; and a PDCCH of four CCEs is an integer multiple of four The CCE position starts; the PDCCH of 8 CCEs starts from an integer multiple of CCE position of 8.
  • the terminal in the connected state calculates the starting point of the proprietary PDCCH search space according to the new identifier sent in the indication information of the base station when detecting the PDCCH. According to the aggregation level of the PDCCH, 1, 2, 4 or 8 consecutive CCEs are blindly detected from the starting point. If a CCE has data, the PDCCH sent by the base station is obtained therefrom.
  • Table 1 shows the PDCCH candidates monitored by a UE in the LTE system: Search space S k(" Number of
  • the size of the PDCCH search space is determined according to Table 1. As shown in Table 1, assuming that the dedicated PDCCH of one terminal occupies only one CCE, the dedicated PDCCH search space of the terminal is six CCEs. According to the existing PDCCH search space determining method, the terminal acquires the starting point of the PDCCH search space as ⁇ ⁇ , and searches for the PDCCH sent by the base station to the terminal among the six CCEs after the starting point. If the z obtained by the six terminals is the same, the search space does not conflict at this time, because the search space has 6 CCEs, and the PDCCH of 6 terminals can be placed.
  • 10 terminals having different C-RNTIs may have a starting point of the search space corresponding to a ⁇ .
  • the base station tries to avoid the collision of the dedicated PDCCH search space between the terminals when the PDCCH search space is allocated to the terminal, the channel of the terminal is constantly changing in the mobile network, and the PDCCH search space can still be accommodated in the subsequent
  • the number of PDCCHs of the terminal is limited, resulting in a phenomenon that the PDCCH cannot be transmitted to the terminal.
  • only six terminals can be accommodated in the space, and four terminals cannot store the PDCCH.
  • the base station cannot place the PDCCH in the search space of the PDCCH corresponding to the terminal, and thus the PDCCH cannot be sent to the terminal.
  • the efficiency of data transmission between the base station and the terminal is reduced.
  • a method for determining a physical downlink control channel search space generateds a rush in a dedicated PDCCH search space of a terminal and a dedicated PDCCH search space of other terminals in the cell.
  • the base station sends indication information to the terminal to indicate that the terminal re-determines the starting point of the terminal's proprietary PDCCH search space according to the new identifier when detecting the PDCCH. Therefore, the terminal obtains the PDCCH command sent by the base station from the starting point, which reduces the collision of the dedicated PDCCH search space between the terminals in the cell, and improves the data transmission efficiency between the base station and the terminal.
  • the base station to send the indication information to the terminal, which are specifically described in steps 22, 32, 42 and 52 of the following embodiments 3 to 6.
  • the terminal identifier is called C-RNTI.
  • the C-RNTI is used to represent the identifier of the terminal.
  • FIG. 2a is a flow chart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention. As shown in FIG. 2a, this embodiment includes:
  • the base station determines whether a collision occurs between the private PDCCH search space of the first terminal and other terminal-specific PDCCH search spaces in the cell except the first terminal.
  • the exclusive PDCCH search of the first terminal The space conflicts with other terminals except the first terminal, that is, the number of terminals in the search space starting from the start point has reached the maximum number of terminals that can be accommodated.
  • the base station When the private PDCCH of the first terminal conflicts with the private PDCCH search space of the other terminal except the first terminal, the base station sends the medium carrying the new C-RNTI to the first terminal at the medium access control layer. Access control packets.
  • the base station After the base station receives the acknowledgement information returned by the first terminal according to the MAC data packet, the base station determines the unique PDCCH search space of the first terminal according to the new C-RNTI of the terminal.
  • the first terminal After receiving the media access control data packet of the C-RNTI, the first terminal returns the acknowledgement information to the base station.
  • the base station receives the acknowledgement message, indicating that the new C-RNTI has taken effect on the terminal side. Then, the base station re-determines the starting point of the terminal's proprietary PDCCH search space according to the new C-RNTI, thereby The PDCCH search space is newly determined.
  • the PDCCH signaling sent by the terminal is placed in the dedicated PDCCH search space determined by the terminal.
  • MAC Media Access Control
  • MAC CE Media Access Control Element
  • Table 3 indicates that the terminal replaces the MAC CE of the C-RNTI.
  • FIG. 2b is a schematic diagram of a data structure of a MAC data packet in an embodiment of a method for determining a physical downlink control channel search space according to an embodiment of the present invention.
  • one MAC PDU is composed of one MAC PDU header, zero or more MAC CEs, zero or more Media Access Control Service Data Units (MAC SDUs), one MAC.
  • MAC SDUs Media Access Control Service Data Units
  • the header contains zero or more MAC PDU headers, each MAC PDU header corresponds to an adjacent MAC CE, or corresponds to one MAC SDU, or corresponds to one padding bit, and the MAC header is arranged in an order with the MAC CE after the MAC header. , MAC SDU, the order of the padding bits is the same, and respectively - corresponding.
  • the receiving side can obtain the corresponding MAC CE or MAC SDU or the padded format location related information through the MAC PDU header.
  • the read MAC header corresponds to a MAC CE after the MAC header, and the MAC header can be used to determine that the MAC header can be used. Which is the MAC CE.
  • the indication information including the new C-RNTI and the replacement C-RNTI is configured to form a MAC PDU packet at the MAC layer, and the MAC PDU packet is sent to the physical layer for processing, and then sent to the terminal that needs to be replaced by the C-RNTI in the subframe. .
  • a method for determining a PDCCH search space is provided in this embodiment.
  • the indication information for replacing the C-RNTI and the new C-RNTI are included, and the MAC layer is formed into a MAC layer.
  • the PDU is sent to the physical layer for processing the MAC PDU and then sent to the terminal.
  • the start point of the terminal's proprietary PDCCH search space is determined according to the new C-RNTI, so as to acquire the PDCCH from the starting point.
  • the procedure for replacing the terminal C-RNTI is small, the delay is low, and only the content related to the replacement of the C-RNTI is transmitted, thereby saving resources.
  • FIG. 3 is a flowchart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention. As shown in FIG. 3, this embodiment includes: 31: Determine whether a conflict occurs between the dedicated PDCCH search space of the first terminal and other terminal-specific PDCCH search spaces in the cell except the first terminal.
  • the base station sends the radio resource control signaling carrying the new C-RNTI to the first terminal at the radio resource control layer.
  • the radio resource control (RRC) signaling is used to notify the terminal that the C-RNTI needs to be replaced, and the new C-RNTI.
  • a new information element (IE) may be added to the RRC connection reconfiguration information, and a new C-RNTI may be written in the new IE.
  • the location of the new IE is based on the LTE version.
  • the base station After receiving the acknowledgment information returned by the first terminal according to the RRC connection reconfiguration signaling, the base station determines the proprietary PDCCH search space of the terminal according to the new C-RNTI of the first terminal.
  • the first terminal After receiving the RRC signaling for replacing the C-RNTI, the first terminal returns an acknowledgement message to the base station.
  • a method for determining a PDCCH search space is provided by the embodiment, and when the current PDCCH of the current terminal conflicts with other terminals in the cell, the indication information including the replacement C-RNTI and the new C-RNTI are loaded in the RRC signaling.
  • the RRC signaling for replacing the C-RNTI is sent to the terminal.
  • the start point of the terminal-specific PDCCH search space is determined according to the new C-RNTI, so that the PDCCH is acquired from the starting point, so that the process of replacing the terminal C-RNTI is small, the delay is low, and only the Replacing C-RNTI related content saves resources.
  • FIG. 4 is a flow chart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention. As shown in FIG. 4, this embodiment includes:
  • Step 41 Determine whether a conflict occurs between the private PDCCH search space of the first terminal and other terminal-specific PDCCH search spaces in the cell except the first terminal.
  • the first terminal-specific PDCCH sends a PDCCH command carrying a new C-RNTI to the first terminal when a collision occurs with a dedicated PDCCH search space of the other terminal than the first terminal in the cell.
  • the PDCCH command is used to notify the terminal that the C-RNTI and the new C-RNTI need to be replaced.
  • the different DCI (Downlink Control Information) format indicates the purpose of the corresponding PDCCH.
  • the DCI formats in the existing LTE are DCI 0/1/1A/1B/1C/1D/2/2A/2B/3/3A, which are used for uplink scheduling, downlink scheduling, and power control.
  • the PDCCH command of the C-RNTI can be replaced by the DCI design.
  • One method is to design a DCI format dedicated to replacing the C-RNTI. For example, the DCI4 format is adopted, and the PDCCH of the DCI4 includes a new C-RNTI, and the terminal receives the DCI4 format.
  • the PDCCH can be used to determine the command to replace the C-RNTI.
  • the base station still scrambles with the original C-RNTI of the terminal to the CRC of the PDCCH, and the specific transmission and reception methods may be the same as the PDCCH of other formats being used in LTE.
  • Another method is: Using the existing DCI format, taking DCI IB as an example, setting the localized/distributed VRB assignment flag to 0; the value of the t ⁇ resource block assignment is set to 1; the original DCI 1 B The remaining information bits are used to represent the new C-RNTI.
  • the terminal After receiving the PDCCH command, the terminal detects the first two field values. If the first part is 0 and the second part has a value of 1, the PDCCH command is a command to replace the C-RNTI, and the remaining bits are represented. New C-RNTI. After the terminal correctly detects the PDCCH command as a command to replace the C-RNTI, the terminal feeds back the acknowledgement information to the base station.
  • the base station After receiving the acknowledgment information returned by the first terminal according to the PDCCH order, the base station determines, according to the new C-RNTI of the first terminal, the dedicated PDCCH search space of the first terminal.
  • the terminal detects the PDCCH, obtains a new C-RNTI after receiving correctly, and feeds back an acknowledgement information, such as an ACK, to the base station.
  • an acknowledgement information such as an ACK
  • FIG. 5 is a flowchart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention. As shown in FIG. 5, this embodiment includes:
  • the first PDCCH search space of the first terminal is notified to the first terminal to initiate random access when it conflicts with the specific PDCCH search space of the other terminal except the first terminal.
  • the base station notifies the first terminal to perform random access, and the notification mode may be notified by using a PDCCH command already existing in the LTE, or by using a high layer signaling.
  • Random access can be non-contentious random access or random access.
  • the first terminal When the first terminal initiates the random access procedure, the first terminal sends the indication information carrying the new C-RNTI, and instructs the first terminal to determine the dedicated PDCCH search space according to the new C-RNTI.
  • the indication information is sent in the random access process of the first terminal, as follows:
  • the first terminal determines whether to initiate non-contention random access according to the random access notification of the base station, or initiates random access based on contention.
  • the base station After receiving the random access response sent by the first terminal, the base station sends the random access response information carrying the new C-RNTI to the first terminal.
  • the random access response information is used to notify the first terminal to replace the C-RNTI.
  • the MAC packet of the LTE random access response is as shown in Table 4.
  • the Temporary C-RNTI domain is not used. If the domain is set to '0, the domain is the existing LTE. The purpose used in the protocol, if set to a valid C-RNTI, indicates that the The machine access is used to replace the C-RNTI, and the content of the domain is the new C-RNTI.
  • the first terminal receives the random access response information after the random access, if the Temporary C-RNTI field is found to be a valid value, the random access is used to notify the first terminal to replace the C-RNTI. After receiving the new C-RNTI, the terminal feeds back the acknowledgement information to the base station, such as ACK:, and the new C-RNTI takes effect after being confirmed by the base station.
  • the contention is random access
  • multiple terminals may initiate random access to the base station at the same time, and the base station has notified the terminal that needs to replace the C-RNTI to initiate random access;
  • the MAC packet of the random access response sent by the base station is as shown in the table. 4, where the Temporary C-RNTI can be used to indicate the value of the new C-RNTI; possibly multiple terminals can receive the random access response information sent by the base station, and the terminal sends the C-RNTI that is being used by the terminal to the base station;
  • the base station determines whether it is the first terminal that needs to replace the C-RNTI according to the C-RNTI of the terminal, and if yes, sends a new C-RNTI to the first terminal.
  • a method for determining a PDCCH search space is provided in this embodiment.
  • the terminal When a proprietary PDCCH of a terminal conflicts with other terminals in the cell, the terminal is notified of the C-RNTI and the new C-RNTI in the random access procedure, so that the terminal is used.
  • the starting point of the terminal's proprietary PDCCH search space is determined according to the new C-RNTI, so as to acquire the PDCCH from the starting point.
  • the terminal may compete for the random access procedure, or may notify the terminal C-RNTI during the non-contention random access procedure of the terminal. Replacing the terminal C-RNTI has fewer processes and delays, and only sends and replaces C-RNTI-related content, saving resources.
  • FIG. 6 is a flowchart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention.
  • the execution body of this embodiment is a terminal. As shown in FIG. 6, this embodiment includes: Step 61: The terminal receives the indication information that is sent by the base station and carries the new identifier of the terminal.
  • the indication information is used to instruct the terminal to determine the terminal's proprietary physical downlink control channel search space according to the new identifier.
  • Step 62 Return confirmation information to the base station according to the indication information, and determine a dedicated physical downlink control channel search space of the terminal according to the new identifier.
  • the terminal returns confirmation information to the base station according to the indication information.
  • the base station receives the acknowledgement message, indicating that the new identity of the terminal is valid.
  • the terminal may receive the indication information sent by the base station in any layer of the radio interface protocol layer, and the specific manners are as follows:
  • the first type At the MAC layer, the MAC data packet sent by the base station and carrying the new identifier of the terminal is received.
  • the MAC data packet sent by the base station and carrying the new identifier of the terminal is received.
  • the second type At the RRC layer, the RRC connection reconfiguration signaling sent by the base station and carrying the new identifier of the terminal is received.
  • the RRC connection reconfiguration signaling sent by the base station and carrying the new identifier of the terminal is received.
  • the third type at the physical layer, receiving PDCCH signaling sent by the base station and carrying the new identifier of the terminal.
  • the fourth type In the process of random access of the terminal, receiving indication information that is sent by the base station and carries a new identifier of the terminal.
  • receiving indication information that is sent by the base station and carries a new identifier of the terminal.
  • a method for determining a PDCCH search space is provided by the embodiment.
  • the terminal receives the indication information sent by the base station, where the indication information indicates
  • the terminal determines the proprietary PDCCH search space of the terminal according to the new identifier. Therefore, the terminal obtains the PDCCH command sent by the base station from the space, which reduces the collision of the dedicated PDCCH search space between the terminals in the cell, and improves the data transmission efficiency between the base station and the terminal.
  • FIG. 7 is a flowchart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention.
  • the execution entity of this embodiment is a base station, and may also be a terminal. As shown in FIG. 7, this embodiment Includes:
  • Step 71 Obtain dynamic information related to the terminal and change with time.
  • the dynamic information is the product of the system frame number and the identifier of the terminal, or a pseudo-random number generated by a predetermined random seed and pseudo-random number generation method.
  • the system frame number is different, and thus, the product of the terminal's identification and the system frame number is related to the terminal and changes with time.
  • the base station and the terminal may agree on a random seed and a method for generating a random number in advance.
  • the base station and the terminal When calculating the terminal-specific PDCCH search space, the base station and the terminal generate a pseudo-random number according to an agreed manner, so the pseudo-random numbers generated by the two parties are the same.
  • a method and a parameter for determining a terminal-specific PDCCH search space by a base station determines "the product of the identity of the terminal and the system frame number" as a parameter for calculating the terminal-specific PDCCH search space. Then, when detecting the PDCCH, the terminal calculates the proprietary PDCCH search space according to the same method as the base station and the same parameter (the product of the identifier of the terminal and the system frame number).
  • Step 72 Determine the terminal's proprietary PDCCH search space according to the identifier of the terminal and the dynamic information.
  • the identifier of the terminal may be the C-RNTI of the terminal.
  • the identifier of the terminal and the dynamic information are used together as a parameter for calculating the terminal-specific search space, so as to avoid the terminal-specific PDCCH search space calculated by the identifier of the primary terminal, and conflict with other terminal-specific PDCCH search spaces.
  • Another method for determining a PDCCH search space provided by this embodiment, together with the dynamic information related to the terminal and the identifier of the terminal, is used as a parameter for determining the terminal-specific PDCCH search space. Since the dynamic information is related to the terminal and changes with time, the probability that the dynamic information is the same for different terminals is extremely small. Therefore, the probability that the terminal-specific PDCCH search space is determined to collide according to the dynamic information is also extremely small.
  • FIG. 8 is a flow chart of another embodiment of a method for determining a physical downlink control channel search space according to the present invention.
  • the dynamic information is the product of the identifier of the terminal and the system frame number, the embodiment includes:
  • Step 81 Obtain the system frame number.
  • the base station periodically notifies the terminal system frame number through the non-dynamic broadcast mode.
  • Step 82 Obtain the product of the system frame number and the identifier of the terminal.
  • Step 83 Obtain a first hash value according to the identifier of the terminal and the product of the system frame number and the identifier of the terminal.
  • obtaining the first hash value includes: identifying the terminal, and multiplying the system frame number by the identifier of the terminal, performing a modulo operation, and acquiring the first hash value. Specifically, formula 1 is used to obtain the first hash value.
  • the input parameters are the product of the C-RNTI of the terminal and the current system frame number, the C-RNTI of the terminal, the Aggregation
  • Step 84 Determine, according to the first hash value, a terminal's proprietary PDCCH search space.
  • the product of the identifier of the terminal and the system frame number as the parameter of Equation 1 can greatly reduce the probability that the ⁇ ⁇ values calculated by different terminals are the same.
  • the first hash value ⁇ ⁇ is used as a starting point of the terminal-specific search space, and the base station places the PDCCH in a certain CCE after the starting point; the terminal blindly detects a plurality of CCEs from the starting point, if the terminal is placed therein The PDCCH is taken out.
  • Another method for determining a PDCCH search space combines a system frame number with a terminal C-RNTI as a parameter for calculating a PDCCH search space. Since the system frame number is changed with time, the system frame number is combined with the C-RNTI of the terminal to calculate the PDCCH search space, which can reduce the probability that the PDCCH search space of different terminals is hashed to the same location, thereby facilitating the improvement of the base station. The efficiency of transferring data with the terminal.
  • FIG. 9 is another flow chart of a method for determining a physical downlink control channel search space according to the present invention.
  • the dynamic information in this embodiment is a pseudo random number generated by the base station and the terminal according to a pre-agreed method. As shown in FIG. 9, this embodiment includes:
  • Step 91 Generate a pseudo random number according to a pre-agreed random seed and pseudo random number generation method.
  • Step 92 Obtain a second hash value according to the identifier of the terminal and the pseudo random number.
  • obtaining the second hash value includes: performing a modulo operation on the identifier of the terminal and the pseudo random number to obtain a second hash value. Specifically, using Equation 2, the second hash value is obtained.
  • ⁇ ⁇ ( ⁇ ⁇ + PSN) modfloor(N CCE IL PDCCH ) (Formula 2)
  • ⁇ i ⁇ modD K denotes a subframe number
  • N ⁇ means the number of CCEs in subframe K;
  • £ ⁇ ⁇ means CCEs used to transmit PDCCH Number, candidate value is ⁇ 1, 2, 4, 8 ⁇ ;
  • CCE is the minimum resource unit for transmitting PDCCH;
  • PSN is pseudo-random number.
  • the input of the modulo operation includes: generating the pseudo random number, the C-RNTI of the terminal, the Aggregation Level, the total number of CCEs in one subframe, and the subframe number.
  • Equation 2 Since the pseudo-random numbers generated by different terminals are different, the probability that ⁇ ⁇ is calculated by Equation 2 is extremely small.
  • Step 93 Determine a terminal-specific PDCCH search space according to the second hash value.
  • the second hash value ⁇ ⁇ is used as the starting point of the terminal-specific search space.
  • the PDCCH is placed in a certain CCE after the starting point; for the terminal, a number of CCEs are blindly detected from the starting point, and if the PDCCH is placed therein, the PDCCH is taken out.
  • This embodiment provides another method for determining a PDCCH search space, and uses a pseudo random number as a parameter for calculating a PDCCH search space. Since the pseudo-random numbers are different according to different random seeds of different terminals, the generated pseudo-random numbers are also different. Therefore, the PDCCH search space is calculated according to the pseudo-random number, and the PDCCH search space hash of different terminals can be reduced to the same. The probability of location, thereby facilitating the efficiency of data transmission between the base station and the terminal.
  • the embodiment includes: a transceiver module 101 and a determination module 102.
  • the transceiver module 101 is configured to send, to the terminal, indication information that carries a new identifier of the terminal, where the indication information is used to indicate that the terminal determines a dedicated physical downlink control channel search space of the terminal according to the new identifier, and sends a new identifier of the terminal to the terminal. After that, the receiving terminal sends confirmation information according to the indication information.
  • the determining module 102 is configured to determine, by the transceiver module 101, the specific physical downlink control channel search space of the terminal according to the new identifier of the terminal after receiving the acknowledgement information sent by the terminal.
  • the transceiver module includes a first sub-module 1011 and a second sub-module 1012.
  • the first sub-module 1011 is configured to send, at the radio interface protocol layer, indication information that carries a new identifier of the terminal to the terminal.
  • the first sub-module 1011 is configured to send, at the media access control layer, a media access control data packet carrying a new identifier of the terminal to the terminal, and receive the acknowledgement information sent by the terminal according to the media access control data packet; or Transmitting, at the RRC layer, the radio resource control connection reconfiguration signaling carrying the new identifier of the terminal, and receiving the acknowledgment information returned by the terminal according to the radio resource control connection reconfiguration signaling; or for transmitting to the terminal at the physical layer
  • the physical downlink control channel command carrying the new identifier of the terminal, and receiving the acknowledgement information returned by the terminal according to the physical downlink control channel command.
  • the second sub-module 1012 is configured to send a random access notification to the terminal, and send, to the terminal, indication information that carries the new identifier of the terminal, to indicate that the terminal determines the specialization of the terminal according to the new identifier.
  • the second sub-module 1012 sends a random access notification to the terminal, and in the terminal random access process, sends the indication information carrying the new identifier of the terminal to the terminal.
  • the second sub-module 1012 receives the confirmation information sent by the terminal according to the indication information.
  • the module 102 determines the proprietary physical downlink control channel search space of the terminal according to the new identifier of the terminal.
  • the transceiver module 101 sends the indication information to the terminal. To indicate that the terminal determines the starting point of the terminal's proprietary PDCCH search space according to the new identity of the terminal. After receiving the acknowledgement information returned by the terminal according to the indication information, the transceiver module 101 determines the terminal's proprietary PDCCH search space. Thereby the terminal acquires the PDCCH order from the space. Therefore, the phenomenon that the dedicated PDCCH search space between the terminals in the cell is conflicted is reduced, and the data transmission efficiency between the base station and the terminal is improved.
  • FIG. 12 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the method includes: a transceiver module 121, configured to receive indication information that is sent by a base station and carries a new identifier of the terminal.
  • the indication information is used to indicate that the terminal determines the dedicated physical downlink control channel search space according to the new identifier, and is configured to send the acknowledgement information to the base station according to the received indication information.
  • the determining module 122 is configured to determine, after the transceiver module 121 sends the acknowledgement information to the base station, the terminal's proprietary physical downlink control channel search space.
  • the transceiver module includes:
  • the first sub-module 1211 is configured to receive, at the radio interface protocol layer, indication information that is sent by the base station and carries a new identifier of the terminal.
  • the first sub-module 1211 is configured to send, at the media access control layer, a media access control data packet carrying a new identifier of the terminal to the terminal, or used to send a new terminal carrying the terminal to the terminal at the radio resource control layer.
  • the working mechanism of the first sub-module 1211 is described in the corresponding embodiment of FIG. 5 and FIG. 6, and is not Let me repeat.
  • the second sub-module 1212 is configured to receive indication information that is sent by the base station and carries a new identifier of the terminal in the random access process.
  • the second sub-module 1212 receives the indication information that is sent by the base station and carries the new identifier of the terminal.
  • the second sub-module 1212 transmits confirmation information to the base station based on the received indication information.
  • the determining module 122 determines the terminal's proprietary physical downlink control channel search space after the second sub-module 1212 sends the acknowledgement information to the base station.
  • the terminal provided by the embodiment receives the indication information of the new identifier sent by the base station and carries the terminal through the transceiver module 121.
  • the determining module 122 determines the terminal's proprietary physical downlink control channel search space after the transceiver module 121 sends the acknowledgment information to the base station.
  • the PDCCH command sent by the base station is obtained by the terminal from the space, which reduces the collision of the dedicated PDCCH search space between the terminals in the cell, and improves the data transmission efficiency between the base station and the terminal.
  • FIG. 14 is a schematic structural diagram of another apparatus for determining a physical downlink control channel search space according to the present invention. As shown in FIG. 14, the apparatus includes:
  • the obtaining module 141 is configured to acquire dynamic information related to the terminal and change with time.
  • the dynamic information is the product of the system frame number and the identifier of the terminal, or a pseudo-random number generated by a pre-agreed random seed and pseudo-random number generation method.
  • the determining module 142 is configured to determine, according to the dynamic information acquired by the acquiring module, and the identifier of the terminal, a dedicated physical downlink control channel search space of the terminal.
  • FIG. 15 is a schematic structural diagram of another embodiment of an apparatus for determining a physical downlink control channel search space according to the present invention
  • the determining module 142 includes:
  • the hash sub-module 1421 is configured to obtain a hash value according to the dynamic information acquired by the acquiring module and the identifier of the terminal.
  • the determining submodule 1422 is configured to determine a specific physical downlink control channel search space of the terminal according to the hash value obtained by the hash submodule.
  • the hash sub-module 1421 obtains the first hash value according to the product of the identifier of the terminal acquired by the obtaining module 141 and the system frame number, and the identifier of the terminal. For example, the hash sub-module 1421 performs a modulo operation on the product of the identifier of the terminal and the system frame number, and the identifier of the terminal, to obtain the first hash value.
  • the determining sub-module 1422 determines the proprietary physical downlink control channel search space of the terminal based on the first hash value obtained by the hash sub-module 1421.
  • the hash sub-module 1421 can obtain the second hash value according to the pseudo random number acquired by the obtaining module 141 and the identifier of the terminal.
  • the pseudo random number is obtained by the acquisition module 141 according to a pre-agreed random seed and pseudo random number generation method.
  • the hash sub-module 1421 performs a modulo operation on the pseudo-random number and the identifier of the terminal to obtain a second hash value.
  • the determining sub-module 1422 determines the terminal's proprietary physical downlink control channel search space based on the second hash value obtained by the hash sub-module 1421.
  • the determining module 142 uses the time-dependent dynamic information related to the terminal acquired by the obtaining module 141, and the identifier of the terminal, as a determining terminal-specific PDCCH search space. parameter. Since the dynamic information is related to the terminal and changes with time, the probability that the dynamic information is the same for different terminals is extremely small. Therefore, the probability of collision of the terminal-specific PDCCH search space determined based on the dynamic information is also extremely small.

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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 et un dispositif pour déterminer l'espace de recherche d'un canal de contrôle de liaison descendante physique (pdcch), le procédé de détermination d'espace de recherche PDCCH comprenant : la transmission d'informations d'indication portant un nouvel identifiant de terminal à un terminal, les informations d'indication étant utilisées pour indiquer au terminal de déterminer un espace de recherche PDCCH spécifique à un terminal selon le nouvel identifiant ; la réception d'informations d'accusé de réception transmises depuis le terminal et la détermination de l'espace de recherche PDCCH spécifique à un terminal selon le nouvel identifiant de terminal. Avec les modes de réalisation de l'invention, le phénomène de conflit d'espace de recherche PDCCH spécifique à un terminal dans une cellule est diminué.
PCT/CN2011/070800 2010-02-09 2011-01-30 Procédé et dispositif pour déterminer l'espace de recherche d'un canal de contrôle de liaison descendante physique (pdcch) WO2011098010A1 (fr)

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