WO2009030168A1 - Procédé et dispositif d'allocation de canal de commande et d'indication d'allocation de canal ack/nack - Google Patents

Procédé et dispositif d'allocation de canal de commande et d'indication d'allocation de canal ack/nack Download PDF

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Publication number
WO2009030168A1
WO2009030168A1 PCT/CN2008/072200 CN2008072200W WO2009030168A1 WO 2009030168 A1 WO2009030168 A1 WO 2009030168A1 CN 2008072200 W CN2008072200 W CN 2008072200W WO 2009030168 A1 WO2009030168 A1 WO 2009030168A1
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WIPO (PCT)
Prior art keywords
ack
cce
pdcch
nack channel
group
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PCT/CN2008/072200
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English (en)
Chinese (zh)
Inventor
Yang Li
Bingyu Qu
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN200880013153.2A priority Critical patent/CN101981995B/zh
Publication of WO2009030168A1 publication Critical patent/WO2009030168A1/fr

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Classifications

    • 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
    • H04L1/1607—Details of the supervisory signal
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the present invention relates to wireless communication technologies, and more particularly to a method and apparatus for control channel element allocation and ACK/NACK channel allocation indication.
  • HARQ Hybrid Auto automatic repeat request
  • the basic process of HARQ technology is as follows: After receiving the data packet, the receiving end first checks whether the data packet is correct. If it is correct, it feeds back a successful acknowledgement ACK (Acknowledgement) signal to the transmitting end, and the transmitting end can continue to send the next data after receiving the ACK. Packet signal; if not correct, feed back a failure response NACK signal to the transmitting end; the transmitting end retransmits after receiving the NACK, transmits the same data packet or the new parity bit information of the data packet, and continues according to the law Until the sender receives the ACK signal or reaches the maximum number of retransmissions.
  • ACK Acknowledgement
  • both uplink and downlink data transmissions use HARQ technology.
  • the uplink HARQ process is: transmitting a downlink ACK/NACK response signal fed back by the base station to the user UE in a Physical HARQ Indicating Channel (PHICH).
  • the downlink HARQ process is: transmitting an uplink ACK/NACK response signal fed back by the UE to the base station in a Physical Uplink Control Channel (PUCCH).
  • PUCCH Physical Uplink Control Channel
  • some resources that transmit uplink ACK/NACK in PHICH and PUCCH are collectively referred to as an ACK/NACK channel.
  • the system needs to reserve ACK/NACK channel resources and set the allocation rules of ACK/NACK channels to transmit response signals of different users.
  • the ACK channel resources reserved by the communication system should be determined by the number of users scheduled by the system to meet the current maximum number of possible scheduled users.
  • the number of ACK channels can be semi-statically adjusted according to the scheduling user situation, and the user is notified through high layer signaling.
  • the signaling indicates that the ACK/NACK channel number assigned to each user is notified.
  • the way the notification is displayed takes up a large signaling overhead.
  • the ACK/NACK channel is implicitly associated with the user's data channel or control channel.
  • the data channel resource or its control channel resource location or sequence number it corresponds to the ACK/NACK channel number assigned to it.
  • An implicit correspondence manner is: corresponding to an ACK/NACK channel and a Physical Downlink Control Channel (PDCCH).
  • the ACK/NACK channel can be used to correspond to a Control Channel Element (CCE).
  • the CCE is a component of a PDCCH resource, and the PDCCH for transmitting uplink/downlink scheduling information is composed of CCEs.
  • the PDCCH may be composed of 1, 2, 4 or 8 CCEs, and the number of different CCEs corresponds to different PDCCH coding rate.
  • the base station determines the format of the PDCCH of the scheduling user, and which one of the PDCCHs of the selected format; that is, which CCEs are combined into a PDCCH.
  • the process of the base station assigning the CCE to the PDCCH of the scheduling user may include combining the available CCEs into all candidate PDCCHs (PDCCH candidates) in various formats, and selecting the required format from all the combined PDCCHs.
  • the PDCCH is allocated to the scheduling user for control signaling transmission.
  • the user performs blind detection on the candidate PDCCH before receiving its PDCCH until its own PDCCH is detected. Therefore, by implicitly mapping the ACK/NACK channel to the CCE, it is possible to ensure that the ACK/NACK channels of different users do not collide, that is, to ensure that different users use different ACK/NACK channels.
  • the system In the communication system, the system generally uses dynamic scheduling and resource sharing, and the number of scheduled users and the scheduled users at different times will change.
  • the E-UTRA system is designed to improve resource utilization.
  • the number of CCEs also changes with the change of N, and the structure of each subframe of the PDCCH composed of CCEs is also different.
  • a specific ACK/NACK channel corresponding to the CCE in the prior art is - correspondingly, that is, one CCE is fixed corresponding to one ACK/NACK, and different CCEs correspond to different ACK/NACK channels.
  • the ACK/NACK channel corresponding to the CCE with the smallest or largest sequence number is specified for the user.
  • FIG. 1 it is a schematic diagram corresponding to an ACK/NACK channel and a CCE in the prior art.
  • the system currently has 11 CCEs, and 11 ACK/NACK channels need to be reserved.
  • the two serial numbers are corresponding to each other, and the designated user uses the ACK/NACK channel corresponding to the CCE with the smallest sequence number in its control channel.
  • the inventors of the present invention found that: in the communication process, the number of CCEs is dynamically changed, and the number of ACK/NACK channels is semi-statically adjusted according to the number of scheduled users.
  • the number of ACK/NACK channel reservations in the system must be greater than the maximum number of CCEs used to combine all candidate PDCCHs to meet the corresponding requirements.
  • the PDCCH allocated to one user may be composed of multiple CCEs, that is, one PDCCH may correspond to multiple ACK/NACK channels, and the user uses only one of the ACK/NACK channels.
  • the number of actually used ACK/NACK channels is generally less than the number of CCEs in the system, and the number of reserved ACK/NACK channels is usually larger than the number of ACK/NACK channels actually used, resulting in a large amount of communication channel resources.
  • the ACK/NACK channels actually used by UE-1 to UE-6 are 0, 4, 6, 8, 9, 10 ACK/NACK channels, respectively, and the remaining reserved channels are 1-3, 5, Seven ACK/NACK channels are wasted. Summary of the invention
  • Embodiments of the present invention provide a control channel unit CCE allocation method and a corresponding ACK/NACK channel allocation indication method and related apparatus, which implement implicit correspondence between CCE and ACK/NACK channel, and reduce waste of communication channel resources.
  • a physical downlink control channel allocation method includes: dividing a physical downlink control channel PDCCH into two groups according to a predetermined PDCCH format; and setting one of the assignable control channel units CCE for each group of PDCCHs respectively Fixed Starting CCE;
  • a CCE is allocated for each of the two sets of PDCCHs starting from the fixed start CCE, respectively.
  • An ACK/NACK channel allocation indication method provided by the embodiment of the present invention includes: dividing a PDCCH into two groups according to a predetermined PDCCH format;
  • the ACK/NACK channel allocated to the scheduling user is indicated according to the correspondence between the set PDCCH and the reserved ACK/NACK channel.
  • the ACK/NACK channel allocation indication method provided by the embodiment of the present invention includes: for the PDCCH to be transmitted to the scheduling user, sequentially assigning CCEs to the PDCCHs according to the format of each PDCCH from large to small;
  • ACK_Index indicates the ACK/NACK channel number corresponding to the PDCCH
  • N ACK indicates the number of reserved ACK channels
  • N CCE per PDCCH indicates the format of the PDCCH
  • CCE_Index indicates the sequence number of the first allocated CCE in the PDCCH, 0 ⁇ CCE _ Index ⁇ N CCE - 1;
  • a grouping unit dividing the PDCCH into two groups according to a PDCCH format
  • An allocation unit configured to allocate a CCE to two sets of PDCCHs; respectively, setting one of the assignable CCEs as a fixed starting CCE for the two sets of PDCCHs; respectively from the fixed starting CCE Initially, a CCE is allocated for each group of PDCCHs.
  • An ACK/NACK channel transmitting apparatus provided by an embodiment of the present invention includes:
  • a corresponding information providing unit configured to divide the PDCCH into two groups according to a format, and provide a correspondence between two groups of PDCCHs and a reserved ACK/NACK channel;
  • An ACK/NACK channel learning unit configured to be provided according to the corresponding information providing unit
  • Corresponding relationship between the PDCCH and the reserved ACK/NACK channel, and the corresponding allocated ACK/NACK channel is learned by using the PDCCH allocation information or the detected PDCCH;
  • an ACK/NACK channel transmitting unit configured to map the ACK/NACK information to the ACK/NACK channel learned by the ACK/NACK channel learning unit for transmission.
  • a base station provided by an embodiment of the present invention includes a PDCCH allocation apparatus, a scheduling apparatus, a mapping apparatus, an ACK/NACK channel transmitting apparatus, and an ACK/NACK channel receiving apparatus;
  • the PDCCH allocation device is connected to the scheduling device and the mapping device, and the scheduling device is configured to determine which users and their PDCCHs are scheduled to be sent to the PDCCH allocation device, where the PDCCH allocation device is used to allocate The CCE is sent to the mapping device for mapping to the physical resource block and then transmitted by the antenna;
  • the PDCCH allocation apparatus includes an allocation unit and a grouping unit; the grouping unit is configured to provide PDCCH group information; the allocation unit is configured to allocate a CCE to a physical downlink control channel PDCCH of a scheduling user to be transmitted, according to a format of each PDCCH. All the candidate PDCCHs are sequentially divided into the order of the candidate PDCCH, and the candidate PDCCH is allocated to the scheduling user, where the format indicates that the PDCCH includes the number of CCEs;
  • the ACK/NACK channel transmitting apparatus is configured to learn, according to the specific correspondence between the ACK/NACK channel and the PDCCH, the corresponding allocated ACK/NACK channel by using the PDCCH allocation information, and map the ACK/NACK channel to the allocated ACK/NACK channel. Transmitted to the terminal;
  • the ACK/NACK channel receiving apparatus is configured to learn, according to the specific correspondence between the ACK/NACK channel and the PDCCH, the corresponding allocated ACK/NACK channel by using the PDCCH allocation information, and receive the ACK sent by the terminal from the allocated ACK/NACK channel. NACK information.
  • a terminal provided by the embodiment of the present invention includes a demapping device, a blind detecting device, an ACK/NACK channel transmitting device, and an ACK/NACK channel receiving device.
  • the demapping device is connected to the blind detecting device, configured to demap the received signals of the terminal to obtain signals on the CCEs, and send the signals on the CCEs to the blind detecting device; the blind detecting devices respectively and the ACK/NACK
  • the channel receiving apparatus is connected to the ACK/NACK channel transmitting apparatus, and configured to perform blind detection on the obtained signals on each CCE to obtain a PDCCH allocated by the base station to itself, and send the sequence information of the CCE included in the allocated PDCCH to the ACK/NACK channel.
  • the ACK/NACK channel receiving apparatus is configured to learn the allocated ACK/NACK channel according to the sequence number of the CCE included in the allocated PDCCH provided by the blind detecting apparatus, and the correspondence between the PDCCH and the reserved ACK/NACK channel, and ACK/ NACK information is mapped to the allocated ACK/NACK channel and transmitted to the base station;
  • the ACK/NACK channel transmitting apparatus is configured to learn the allocated ACK/NACK channel according to the sequence number of the CCE included in the allocated PDCCH provided by the blind detecting apparatus, and the correspondence between the PDCCH and the reserved ACK/NACK channel, from the allocated The ACK/NACK information sent by the base station is received on the ACK/NACK channel.
  • the PDCCH is divided into two groups according to a predetermined PDCCH format; one of the two sets of PDCCHs is set as a fixed start CCE for the two sets of PDCCHs respectively; Starting with the CCE, a CCE is allocated for each group of PDCCHs of the two groups of PDCCHs; and an ACK/NACK channel allocated to the scheduling user is indicated according to a correspondence between the set PDCCH and the reserved ACK/NACK channel.
  • the CCEs are sequentially allocated according to the number of CCEs included in each PDCCH; the assignable CCEs and the ACK/NACK channels reserved by the system
  • the number of ACK/NACK channels reserved by the system is smaller than the maximum value of the assignable CCEs.
  • the receiving side the receiving side according to the number of CCEs included in the PDCCH and the PDCCH.
  • the sequence number of the first allocated CCE, and the sequence number of the ACK/NACK channel on the receiving side is obtained.
  • the implicit indication of the ACK/NACK channel can be implemented according to the embodiment of the present invention, and the number of reserved ACK/NACK channels is less than the number of CCEs, which reduces the waste of channel resources.
  • FIG. 1 is a schematic diagram corresponding to an ACK/NACK channel and a CCE in the prior art
  • FIG. 2 is a tree-like knot corresponding to an ACK/NACK channel and a CCE implicitly in Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of a method for allocating a CCE according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic diagram of an implicit correspondence between an ACK/NACK channel and a CCE in a second application example 1 of the present invention
  • FIG. 5 is a schematic diagram of another implicit correspondence between an ACK/NACK channel and a CCE in Application Example 2 of the present invention
  • FIG. 6 is a schematic diagram of an implicit correspondence between an ACK/NACK channel and a CCE in Application Example 6 of the present invention
  • FIG. 7 is a schematic diagram of an implicit correspondence between an ACK/NACK channel and a CCE in a first group in Application Example 3 of the present invention
  • FIG. 8 is a schematic diagram of an implicit correspondence between an ACK/NACK channel and a CCE in a second group in Application Example 3 of the present invention.
  • FIG. 9 is a schematic diagram of an implicit correspondence between an ACK/NACK channel and a CCE in the first group and the second group in the application example 4 of the present invention.
  • FIG. 10 is a schematic diagram of an implicit correspondence between an ACK/NACK channel and a CCE of a first group and a second group in Application Example 5 of the present invention
  • FIG. 11 is a schematic diagram of implicit correspondence between an ACK/NACK channel and a CCE in a first group and a second group according to Embodiment 4 of the present invention
  • FIG. 12 is a schematic diagram of implicit correspondence between an ACK/NACK channel and a CCE in a first group and a second group according to Embodiment 4 of the present invention
  • FIG. 13 is a schematic diagram of a CCE packet in Embodiment 5 of the present invention.
  • FIG. 14 is a schematic diagram of a CCE packet overlapping in Embodiment 5 of the present invention.
  • FIG. 15 is a structural diagram of a CCE distribution apparatus according to Embodiment 6 of the present invention.
  • FIG. 16 is a schematic structural diagram of an ACK/NACK channel transmitting apparatus according to Embodiment 6 of the present invention.
  • Figure 17 is a schematic structural diagram of an ACK/NACK channel receiving apparatus according to Embodiment 6 of the present invention. detailed description
  • the following embodiments of the present invention are described based on an E-UTRA system, providing ACK/NACK Method for channel indication, the method for indicating each ACK/NACK channel is composed of a PDCCH allocation method and a corresponding method of ACK/NACK channel and PDCCH.
  • the corresponding method of the ACK/NACK channel and the PDCCH includes the following steps:
  • Step S101 For the PDCCH of the scheduling user, the available CCEs are sequentially allocated according to the format of each PDCCH from large to small.
  • the format specifically refers to the number of CCEs included in the PDCCH.
  • the PDCCH may contain 1, 2, 4 or 8 CCEs, and correspondingly, there are 4, 2, 4, and 8 formats.
  • the above available CCEs are: The system sets a CCE that can be used to transmit the PDCCH of the uplink scheduling signaling, or the system sets a CCE of a PDCCH that can be used for transmitting downlink scheduling signaling, or a CCE that is available for all PDCCHs.
  • the CCE is allocated to the PDCCH with a large format, and the PDCCHs with the same format are allocated to the adjacent CCEs.
  • the assignable CCEs are sorted by number, and CCEs are assigned in ascending or descending order according to the CCE number.
  • Step S102 Establish a specific correspondence between the CCE allocated for the PDCCH and the reserved ACK/NACK channel.
  • ACK_ Index CCE_ Index IN CCE per PDCCH ; Equation 1 If CCE is assigned in descending order,
  • ACK_ Index (N CCE - CCE_ Index ) IN CCE per ; Equation 2 where N ⁇ represents the number of reserved ACK channels, ACK_Index indicates the ACK/NACK channel number corresponding to the PDCCH, 0 ⁇ ACK _ Index ⁇ N ACK - 1; N CCE per PDCCH indicates the format of the PDCCH; CCE_Index indicates the sequence number of the first CCE allocated in the PDCCH,
  • N CCE indicates the number of CCEs in the CCE set that can be allocated.
  • the sequence numbers of the ACK/NACK channels corresponding to the PDCCHs of the same format are consecutive, so that when there are multiple PDCCH transmissions with large formats, the reduction is not enabled.
  • the user terminal After the user terminal blindly detects its own PDCCH, it learns the ACK/NACK channel allocated to itself according to the correspondence between the CCE allocated to the PDCCH and the ACK/NACK channel.
  • the method corresponding to the above ACK/NACK channel and CCE can be expressed in a tree structure.
  • the above formula 1 is represented by a tree structure, specifically: the node label of layer 4 represents the ACK/NACK channel number corresponding to the PDCCH of format 8; the node label of layer 3 represents the ACK/NACK channel number corresponding to the PDCCH of format 4
  • the node label of layer 2 indicates the ACK/NACK channel number corresponding to the PDCCH of format 2; the node label of layer 1 indicates the ACK/NACK channel number corresponding to the PDCCH of format 1.
  • the reserved ACK/NACK channel in the actual communication process is generally completed during system initialization, and does not need to be dynamically modified during the communication process. That is, the system can reserve enough ACK/NACK channel resources according to the maximum demand. Preferably, when only a part of the reserved ACK/NACK channel is used, the remaining ACK/NACK channel resources can be used for data transmission of other physical channels.
  • the result of the foregoing can be seen that, by using the foregoing PDCCH and ACK/NACK channel corresponding method in the embodiment, the number of reserved ACK/NACK channels can be smaller than the maximum number of CCEs in the system, thereby reducing waste of communication resources. .
  • the PDCCH is grouped to further reduce the waste of communication resources.
  • the CCE allocation method includes the following steps:
  • Step S301 The PDCCH is divided into two groups, and the PDCCH format of the first group of PDCCHs and the second group of PDCCHs are different.
  • the first group of PDCCHs is hereinafter referred to as the second group of PDCCHs as PG 2 .
  • the PDCCH format included in the PG 2 may be preset by the system and fixed during the communication process; or may be dynamically or semi-statically changed according to the number of assignable CCEs and the number of reserved ACK/NACK channels.
  • Step S302 Set a fixed starting CCE in the available CCE set for each of the two sets of PDCCHs.
  • the CCE in the CCE set is:
  • the system setting can be assigned to the transmission uplink scheduling signaling.
  • the CCE of the PDCCH may be allocated to the CCE of the PDCCH transmitting the downlink scheduling signaling, or the CCE available for all PDCCHs.
  • ⁇ ⁇ indicates the number of CCEs in the CCE set
  • CCE—a indicates the CCE with the sequence number a
  • SI and S2 respectively indicate the sequence number of the fixed starting CCE in the CCE set relative to the allocation of ⁇ and PG 2 , 0 ⁇ 1 ⁇ N CC£ -1, 0 ⁇ 2 ⁇ N CC£ -1, and S1 ⁇ S2.
  • Step S303 The CCEs are assigned the same order in a specific order starting from CCE-Si and CCE-S2, respectively.
  • the first group of PDCCHs is allocated from CCE-S1
  • the second group of PDCCHs is allocated from CCE-S2.
  • the specific order is: for different PDCCHs in each group, the CCEs are sequentially allocated according to the number of CCEs included in each PDCCH; the first group and the second group are in ascending or descending order of the CCE sequence numbers, respectively. Assign CCE.
  • the first group allocates CCEs in ascending or descending order according to the CCE number
  • the second group may also allocate CCEs in ascending or descending order according to the CCE number.
  • the CCE_Index is used to indicate the sequence number of the first CCE allocated in the specific PDCCH, 0 ⁇ CCE_Ind ex ⁇ N CC£ - 1.
  • the CCE_index is the sequence number of the CCE with the smallest sequence number assigned to the PDCCH; and for the PDCCH in which the CCEs are allocated in descending order, the CCE_index is the sequence number of the CCE with the largest sequence number assigned to the PDCCH.
  • the CCE allocation method provided in this embodiment further includes the establishment of the correspondence between the ACK/NACK channel and the CCE, and may be allocated to the CCE of each group of PDCCHs and the ACK/NACK channel reserved by the system in the foregoing step S301.
  • a specific correspondence specifically:
  • ACK_Index 4 + (CCE_Index - SI)/ N CCE PER PDCCH ;
  • ACKJndex A 2 - (CCE_ Index - N CCE PER PDCCH ;
  • ACKJndex A 2 - S1 - CCE - Index) / N CCE PER PDCCH ;
  • N ⁇ represents the number of reserved ACK channels
  • ACK_Index represents the corresponding user ACK/NACK channel number, 0 ⁇ ACK _ Index ⁇ N ACK -1
  • N CCE per PDCCH indicates the format of the PDCCH
  • CCE_Index indicates the sequence number of the first CCE allocated in the PDCCH, 0 ⁇ CCE _ Index ⁇ N CC £ -1
  • 4 indicates the starting ACK/NACK channel number corresponding to the first group of PDCCHs, 0 ⁇ 4 ⁇ Nn - 1
  • a 2 indicates the starting ACK/NACK channel number corresponding to the second group of PDCCHs, 0 ⁇ 4 ⁇ N - 1, 4 ⁇ 4.
  • the sequence numbers of the ACK/NACK channels corresponding to the PDCCHs of the same format are consecutive in the two groups, so that when there are multiple PDCCH transmissions with large format, the ACK/NACK that cannot be used is reduced.
  • the values of 4 and 4 can be preset by the system or dynamically changed according to the change in the number of CCEs in the communication process. For example, it can be realized by setting the correspondence between the number of CCEs and the value of 4.
  • the specific value of the change 4 and A 2 may be selected to limit the range of the ACK/NACK channel that the PDCCH channel can actually correspond to, so that the ACK/NACK channel that is not used may be intact and fixed, which is beneficial to other physical channels. Part of the resources.
  • the user terminal learns the ACK/NACK channel allocated for use by itself.
  • the foregoing embodiment supports the case where the number of reserved ACK/NACK channels is less than the number of CCEs; and provides a unified CCE corresponding to the ACK/NACK channel when the number of CCEs changes dynamically and the number of ACK/NACK channels changes semi-statically. the rule of.
  • the CCEs used by the PDCCHs of different formats are allocated from the specific locations of the CCE sequence numbers, especially the two start positions, respectively, so that the PDCCHs occupied by the PDCCHs containing multiple CCEs are occupied.
  • the ACK channel that is not actually used can also be used by the PDCCH of other users, so that more can be scheduled in the case of the same number of CCEs and the number of ACK channels. Users, reduce the waste of CCE and ACK channel resources.
  • the system currently has five scheduling users UE-1, UE-2, UE-3, UE-4, and UE5, and the format of each user PDCCH is 8, 4, 2, 1, and 1, respectively.
  • UE- 1 UE 2, UE PDCCH 3 belongs, UE 4, UE PDCCH 5 belongs to PG 2.
  • the network side's CCE allocation result for the PDCCH is:
  • the PDCCH of UE 1 is allocated to CCE-0, CCE 1 CCE 7, the PDCCH of UE 2 is allocated to CCE-8, CCE 9 CCE ll, and the PDCCH of UE 3 is allocated to CCE-12.
  • the PDCCH of UE-4 is allocated to CCE-16, and the PDCCH of UE-5 is allocated to CCE-17.
  • the user first allocates the PDCCH according to the format of the detected PDCCH.
  • the sequence number of the CCE is obtained according to the implicit correspondence rule of the CCE and the ACK/NACK channel, and the ACK/NACK channel number assigned by each user is obtained.
  • knowing the format of the PDCCH the packet to which the PDCCH belongs can be known. The result is:
  • the PDCCH, PG 2 includes the PDCCH of UE-2, UE3, UE-4, and UE5.
  • the case where the CCE is allocated to the PDCCHs of the five UEs in the first example is:
  • the PDCCH of UE 1 is allocated to CCE-0, CCE 1 ... CCE 7; the PDCCH of UE 2 is allocated to CCE-17, CCE 16 ... CCE 14, and the PDCCH of UE 3 is assigned to CCE - 13,
  • CCE-12 UE-4's PDCCH is allocated to CCE-10, and UE-5's PDCCH is allocated to CCE-10.
  • the user obtains the ACK/NACK channel number assigned by each user according to the implicit correspondence rule of the foregoing CCE and ACK/NACK channel, and the result is:
  • the ACK/NACK channel collision of two users does not occur on the receiving side.
  • the PDCCHs below 4 CCEs are divided into ⁇ ( ⁇ 2 , which avoids the waste of ACK/NACK channels caused by the control channels of 8 CCEs and 4 CCEs occupying consecutive CCEs.
  • the ACK channel with sequence number 1 in Example 1 cannot be used. The case of being used.
  • a method for mapping a CCE to an ACK/NACK channel according to a method of dividing a PDCCH into two groups according to a specific rule and acquiring an ACK/NACK channel according to a specific rule make further improvements.
  • the method includes:
  • This step includes:
  • the PDCCH is divided into two groups, and the grouping method is specifically:
  • S501b combines available CCEs into all candidate PDCCHs in various formats. The specific combination is:
  • the PDCCH in the format, _ ; +1 , ; +2 ... PDCCH is composed of consecutive +1 , +2 , ... CCEs respectively.
  • the PDCCH of the format is a PDCCH that is composed of consecutive PDCCHs. Since f U ccE, all possible PDCCHs of the format _; cannot occupy all CCEs.
  • one fixed initial CCE in the assignable CCE set may be separately set for two sets of PDCCHs.
  • the allocation is selected from all candidate PDCCHs in a certain order.
  • the CCE in the CCE set is: the system sets the CCE of the PDCCH that can be used to transmit the uplink scheduling signaling, or the system sets the CCE of the PDCCH that can be used to transmit the downlink scheduling signaling, or the CCEs that are available for all PDCCHs.
  • ⁇ ⁇ indicates the number of CCEs in the CCE set
  • CCE—a indicates the CCE with the sequence number a
  • SI and S2 respectively indicate the sequence number of the fixed starting CCE in the CCE set relative to the allocation of ⁇ and PG 2 , 0 ⁇ 1 ⁇ N CC£ -1, 0 ⁇ S2 ⁇ N CCE —
  • CCEs with sequence numbers S, S, +f 1+l , S, +2f M , S, +3f M +(N ACK -l)f M 4, 4+i, 4+2, ..., 4+Nn-i correspond to ACK/NACK channels.
  • the corresponding ACK/NACK channel of the PDCCH in the format f 1+1 1+2 ... takes the ACK channel corresponding to the CCE included in the PDCCH. If there are multiple, the ACK/NACK channel corresponding to the smallest or largest CCE may be taken.
  • the specific correspondence may be expressed as:
  • CCE_Index indicates the sequence number of the CCE corresponding to the ACK/NACK channel.
  • the specific correspondence is: according to the occupation order of the CCE, the row correspondence: the first priority is an ACK/NACK channel that is not likely to be used by the PDCCH in the format of the first group of PDCCHs, and the second The priority is an ACK/NACK channel that is not likely to be used by the PDCCH of the first group of PDCCHs in the format of +2 , but does not include the ACK/NACK channel corresponding to the PDCCH channel occupying the CCE in the format of +2 , third The priority is an ACK/NACK channel that cannot be used by the PDCCH in the format of +3 , but does not include the ACK/NACK channel corresponding to the PDCCH channel occupying the CCE in the format of +3 , sequentially recursive, and the Nth priority It is an ACK/NACK channel that cannot be used by a PDCCH of format N , but does not include an ACK/NACK channel corresponding to a
  • each priority level if a plurality of ACK / NACK channels may correspond to, you can select one of them, for example, when 2 ⁇ CCE occupied in ascending order, select the maximum number of CCE corresponding ACK / NACK channel, when ⁇ 2 When the CCE is occupied in descending order, the ACK/NACK channel corresponding to the CCE with the smallest sequence number is selected.
  • the CCEs with the sequence numbers S 2 , S 2 +f t , S 2 +2 fi , S 2 +3 S 2 + (N ACK - 1) are in accordance with the above correspondence.
  • the sequence number is S 2 , S2- ., S 2 - 2 ., S 2 - 3 .,..., - (N - 1)
  • the CCEs correspond to the ACK/NACK channel in order according to the above correspondence.
  • the corresponding ACK/NACK channel of the PDCCH in the PG 2 format is _ ACK channel corresponding to the CCE included in the PDCCH.
  • the other serial number is S 2 + ⁇ +l.
  • - 1 CCE corresponds to the same ACK/NACK channel as CCE with sequence number S kJ]; when CCE is occupied in ascending order according to CCE number, other sequence numbers are used.
  • S 2 -kf " ⁇ , S 2 - 2 , S 2 - ( ⁇ + ⁇ ; +1 CCE corresponds to the same ACK/NACK channel as CCE with sequence number ", where k H - is in the format _;
  • the ACK/NACK channel corresponding to the PDCCH of .2 , . . . is the ACK/NACK channel corresponding to the CCE included therein.
  • the PDCCHs of the same format are allocated CCEs corresponding to different ACK/NACK channels, so that collisions of the same format PDCCH corresponding to the same ACK/NACK channel can be avoided.
  • the CCE occupation is performed in ascending order of the CCE number
  • the CCEs with the numbers -1, ..., - _; -, - may be combined into a PDCCH of the format f t _.
  • the CCEs of -kf t , S 2 -kf t -l,...,S 2 -kf -f ⁇ -1 can be combined into a PDCCH of format 2 .
  • the core idea of the corresponding rule is to associate the PDCCH (G 2 ) with a small format with the ACK/NACK channel that cannot correspond to the PDCCH (in the PG X ) with a large format, so that the NodeB does not increase any restrictions when performing CCE allocation.
  • the situation can also avoid collision of the corresponding ACK/NACK channel.
  • the user terminal after blindly detecting its own PDCCH, learns the ACK/NACK channel allocated for itself according to the foregoing PDCCH allocation method and the corresponding method of the ACK/NACK channel and the CCE.
  • the above corresponding rules can also be used for partial ACK/NACK channels.
  • the PDCCH format is assumed to be the largest PDCCH format (ie, the PDCCH can be composed of at most CCEs)
  • the above rule can be used for N ACK - 1 (V f M ) - N CCE " ACK/NACK channels, and the PG 2 does not follow the above.
  • a channel other than 0 ⁇ 01 channel Corresponding to the rules that are not corresponding to the ACK/NACK channel. That is, as shown in Figure 6, for ⁇ ? 2 C 15 ⁇ (: i. These 6 CCEs correspond to 6 ACK/NACK channels, according to the above rules. At this time, there are no correspondences between ACK-0 and ACK-4, then the rules used, C. and ACK-0 Correspondingly, C 8 corresponds to ACK-4.
  • the ACK/NACK channel allocation implicit indication in the case that the number of ACK/NACK channels is equal to the number of scheduled users is implemented, so that the number of ACK/NACK channels that need to be reserved is significantly reduced, and resource waste is avoided;
  • the CCE resources can be completely used without causing the corresponding collision of the ACK/NACK channels. Therefore, the waste of CCE resources is avoided, and the number of schedulable users is increased.
  • This example is applied to the E-UTRA system.
  • the format of the PDCCH is ⁇ 1, 2, 4, 8 ⁇ .
  • All possible PDCCHs of format 2 are ACK/NACK channels with sequence numbers 0, 1, 2, 3, ... ⁇ 7; all possible PDCCHs with format 4 are sequentially corresponding to sequence numbers 0, 2, 4 , 6 ACK/NACK channel, all possible PDCCHs of format 8 are in turn corresponding to ACK/NACK channels with sequence numbers 0, 2, 4, 6.
  • the PDCCHs of UE-1, UE2, and UE3 respectively correspond to ACK/NACK channels of sequence numbers 0, 4, and 6.
  • third priority, ACK/NACK channel that cannot be used by the PDCCH of ⁇ douche 4 but does not include the CCE occupying the CCE
  • the first priority ACK/NACK channel is ACK-7
  • the CCE 15 corresponds to ACK-7: that is, when the CCE-15 is allocated to the PDCCH of one CCE in the PG 2 , the PDCCH with the format 2 may no longer occupy the CCE— 14.
  • CCE 15 and other CCEs can be allocated to the PDCCH of format 2, so ACK-7 cannot be corresponding or occupied by the PDCCH of format 2.
  • the first priority ACK-7 has been occupied by CCE-15, thus seeking a second priority.
  • the second priority ACK/NACK channel is ACK-1, ACK-3, ACK-5, then CCE 14 corresponds to ACK-1:
  • the PDCCH with a medium format of 4 may correspond to ACK-0, ACK 2, and ACK 4, respectively.
  • ACK-6, then ACK-1, ACK-3, ACK-5 are channels that are not possible to be mapped by the PDCCH of format 4, and since CCE-14 is occupied by the PDCCHs of the four CCEs corresponding to ACK-7, therefore,
  • c i4 corresponds to the smallest ACK-1 of the three ACK/NACK channels
  • the first priority ACK/NACK channel is ACK-6, then the CCE 13 corresponds to ACK-6: that is, when the CCE-13 is allocated to the PDCCH of one CCE in the PG 2, the format of the PG i is 2.
  • the PDCCH may no longer occupy CCE-12, CCE 13, and other CCEs may be allocated to the PDCCH of format 2, so ACK-6 may not be corresponding to or occupied by the PDCCH of format 2.
  • This example is also applied to the E-UTRA system.
  • the system reserves There are 4 ACK channels. Others are the same: There are 16 CCEs in the CCE set to be allocated, and the format of the PDCCH is ⁇ 1, 2, 4, 8 ⁇ .
  • all possible PDCCHs of format 4 correspond to ACK_0, ACK_1, ACK_2, ACK_3; all possible PDCCHs of format 8 correspond to ACK-0, ACK-2;
  • CCE with sequence numbers 15, 14 corresponds to ACK-3
  • CCE with sequence numbers 13 and 12 corresponds to ACK1.
  • the CCEs with sequence numbers 11 and 10 correspond to ACK 2
  • the CCEs with sequence numbers 9 and 8 correspond to ACK-0.
  • the ACK/NACK channels corresponding to the PDCCHs of UE-1, UE2, UE3, and UE4 are ACK_0, ACK-2, ACK-3, and ACK-1, respectively.
  • a case may occur in which different CCEs for PDCCHs of the same format correspond to the same ACK/NACK channel.
  • CCE-15 and CCE 14 are respectively available for different PDCCHs of format 1, the two PDCCHs correspond to the same ACK/NACK channel.
  • CCEs corresponding to different ACK/NACK channels are allocated to PDCCHs of the same format, so that collision of corresponding ACK/NACK channels can be avoided.
  • CCEs with sequence numbers 0, 2, 4, 6, 8, 10, 12, 14 correspond to ACK/NACK channels with sequence numbers 0, 1, 2, 3, 4, 5, 6, and 7, respectively.
  • the first priority that is, the ACK/NACK channel of the PDCCH of format 2 can be occupied, and thus the second priority is sought;
  • the second priority may correspond to an ACK/NACK channel of ACK-5, ACK7 (ie, an ACK/NACK channel that cannot be occupied by a PDCCH of format 4), and CCE 1 corresponds to ACK-7:
  • the ACK/NACK channel corresponding to the second priority is ACK-5
  • CCE 3 corresponds to ACK-5:
  • the ACK/NACK channel that can be corresponding to the third priority is ACK-6 (that is, the ACK/NACK channel that the PDCCH of format 8 cannot occupy), then CCE 7 corresponds to ACK-6:
  • the third priority can correspond to the ACK/NACK channel as ACK-4 (that is, the format is 8).
  • CCE 7 corresponds to ACK-4:
  • CCE-7 when CCE-7 is allocated to a PDCCH of a CCE, it indicates that there are currently 8 PDCCH transmissions. Since the number of transmitted PDCCHs cannot be greater than the number of ACK/NACK channels, it is impossible to transmit the PDCCH occupying CCE8 CCE15.
  • CCE-7 can correspond to the ACK/NACK channel corresponding to CCE 8.
  • This example is also applied to the E-UTRA system.
  • the CCEs allocated to the PDCCH are divided into two groups.
  • the PDCCH with the format of 2, 4, and 8 is included, and the rules of the PDCCH partially formatted by 1 are mapped.
  • Ll/ 8 refers to FIG. 6 , Ll/ 8 .
  • the PDCCH of 1 CCE in format 1 is specifically 2 in the figure, which are CCE 0 and CCE 8.
  • PG 2 contains the remaining 1 CCE PDCCH channel of format 1, specifically CCE 10, 11, 12, 13, 14, 15 in FIG.
  • the rules determined channel PDCCH CCE 1 CCE occupied can no longer be in the PDCCH channel PG 2 1CCE occupancy, i.e., the PG 2 is occupied by a continuous PDCCH CCE resources remaining.
  • the ACK/NACK channel label corresponding to the channel in the PG 2 can be determined.
  • the PDCCH of the 1CCE and its corresponding ACK/NACK channel number in the PG 2 are identical to the example 3.
  • This embodiment is basically the same as the third embodiment.
  • the first priority is impossible to be mapped by the PDCCH of the format f + x
  • the ACK/NACK channel used the second priority is an ACK/NACK channel that cannot be used by the PDCCH corresponding to the format f ]+2 , but does not include the ACK/NACK corresponding to the PDCCH channel occupying the CCE in the format of +2 .
  • the third priority is an ACK/NACK channel that cannot be used by the PDCCH of the format +3 , but does not include the ACK/NACK channel corresponding to the PDCCH channel of the CCE format of +3 , and the Nth priority is not An ACK/NACK channel that may be used in the format of f + N ] PDCCH, where N is a positive integer; and, may not correspond to an ACK/NACK channel corresponding to the CCE of the PG 2 that precedes its allocation.
  • the format of the PDCCH is ⁇ 1, 2, 4, 8 ⁇ , and the number of ACK/NACK channels N ⁇ is 4, CCE number N ee £ 16, first determine ⁇ is the PDCCH channel of format ⁇ 4, 8 ⁇ , PG 2 is the PDCCH channel of format ⁇ 1, 2 ⁇ , then as shown in Figure 11, 4CCE PDCCH CCEO
  • the corresponding ACK is ACK_0
  • the ACK corresponding to CCE4 is ACK-1
  • the ACK corresponding to CCE8 is ACK_2
  • the ACK corresponding to CCE12 is ACK3
  • 8CCE PDCCH CCEO corresponding ACK is ACK-0
  • CCE8 corresponding ACK is ACK- 2.
  • the PDCCH of 2CCE in PG 2 uses the rule in Embodiment 3, CCE14 corresponds to ACK-3, CCE12 corresponds to ACK-1, CCE10 corresponds to ACK2, and CCE8 corresponds to ACK-0.
  • the PDCCH channel of the 1CCE in the PG 2 continuously occupies CCE resources, and the mapped ACK channel needs to consider the ACK corresponding to the PDCCH channel of the format ⁇ 2, 4, 8 ⁇ .
  • ⁇ 1 ⁇ is a format of PDCCH channel, as shown in FIG 11, the format of a PDCCH channel corresponding to the ACK channel, respectively, CCE15
  • the corresponding ACK channel is a channel that cannot be occupied by the PDCCH of format ⁇ 2 ⁇ , which is ACK-3
  • the ACK channel corresponding to CCE14 is a channel that cannot be occupied by the PDCCH whose format is ⁇ 2 ⁇
  • the priority selection format is ⁇ 4 ⁇ .
  • the channel that the PDCCH cannot occupy, and then the channel with the PDCCH that cannot be occupied by the PDCCH with the format of ⁇ 8 ⁇ is selected first.
  • the channel ACK 1 that cannot be occupied by the PDCCH with the format of ⁇ 8 ⁇ is selected, and the same rule of CCE13 corresponds to ACK-2, CCE14. Corresponds to ACK-0.
  • the format of the PDCCH is ⁇ 1, 2, 4, 8 ⁇
  • the number of ACK/NACK channels is N ACK
  • the number of CCEs is N COT 16, which is also determined.
  • Configuration 3 ⁇ 4 2) ⁇ 1 ⁇ is a format of PDCCH
  • 3 ⁇ 4 ⁇ ⁇ 2,4,8 ⁇ is the format of the PDCCH, for 3 ⁇ 4 ⁇ , 3 ⁇ 4 2) using the similar rules, i.e.
  • PG ⁇ is the PDCCH channel 1CCE
  • the channel that cannot be used by the 2CCE PDCCH is preferentially used, and the channel that cannot be used by the 4CCE PDCCH is preferentially used, and then the channel that cannot be used by the 8CCE PDCCH is preferentially used, and CCE 15, 14, 13, 12, 10 respectively correspond to the ACK-5.
  • the two PDCCHs (both of which are used for uplink and downlink scheduling related control signaling transmissions) may exist simultaneously in one downlink subframe, based on the foregoing embodiments. For further optimization.
  • the two PDCCHs both of which are used for uplink and downlink scheduling related control signaling transmissions
  • the S7010 divides the CCE into two groups, and the first group is used for transmitting the PDCCH of the uplink scheduling signaling.
  • the second group is used for transmitting the PDCCH of the downlink scheduling signaling.
  • the step of acquiring an ACK/NACK channel comprises: obtaining a sequence number of a downlink ACK/NACK channel according to a CCE set used for uplink scheduling signaling transmission, according to a CCE set used for downlink scheduling signaling transmission The sequence number of the uplink ACK/NACK channel.
  • the two sets of CCEs respectively form two CCE sets, then the downlink ACK/NACK channel corresponds to the CCE set used for uplink scheduling signaling transmission, and the uplink ACK/NACK channel corresponds to the CCE set used for downlink scheduling signaling transmission.
  • the first group and the second group of CCEs do not include the same CCE, that is, they do not intersect, the user performs the uplink and downlink ACK/NACK channels according to the foregoing embodiments.
  • the uplink ACK/NACK channel is implicitly indicated by its corresponding CCE set for downlink scheduling signaling transmission, and the downlink ACK/NACK channel is implicitly indicated with its corresponding CCE set for uplink scheduling signaling transmission.
  • the ACK/NACK channel is first mapped to the CCE according to the method in the non-overlapping subset in the CCE set.
  • the PDCCH starting CCE for downlink and uplink scheduling signaling transmission is set,
  • the Gi and C s ' are respectively the same as the PDCCH, and the uplink ACK/NACK channel start sequence corresponding to the PDCCH for the downlink scheduling signaling transmission and the downlink corresponding to the PDCCH for the uplink scheduling signaling transmission are set.
  • the ACK/NACK channel start sequence ' still enables the method of the present invention to be used in all areas of the channel used for downlink scheduling.
  • the ACK/NACK channel resources corresponding to the overlapping area are obviously released when the overlapping area is allocated to the uplink scheduled channel. Therefore, the ACK/NACK channel resource corresponding to the overlap region can be changed by the logical label of the CCE resource of the overlap region, so that the corresponding ACK/NACK channel is the ACK/NACK channel resource with a larger label.
  • the PDCCH can be used for uplink/downlink scheduling related control signaling transmission.
  • the CCE can be divided into two groups. On the one hand, the user can simultaneously perform blind detection of CCE, and on the other hand, the CCE resources utilized by the system can be further reduced.
  • a PDCCH allocation apparatus 10 provided by an embodiment of the present invention includes:
  • the allocating unit 101 is configured to combine the available CCEs into all candidate PDCCHs in various formats, and select a PDCCH to be allocated to the scheduling user according to the format of the PDCCH to be transmitted;
  • the PDCCH allocation apparatus 10 in addition to the allocating unit 101, may further include: a grouping unit 102, configured to divide all candidate PDCCHs into two groups, and the first group of PDCCHs includes at least one format.
  • the PDCCH, the second group of PDCCHs does not include the PDCCH in the same format as the first group of PDCCHs, and the format is that the PDCCH includes the number of CCEs; the information that is grouped by the packet unit 102 is retransmitted to the allocating unit 101 for allocation processing.
  • Such a PDCCH allocation device may be a chip or a logic module that implements its functions.
  • Such a PDCCH allocation apparatus allocates CCEs used by PDCCHs of different formats from a specific location of a CCE sequence, especially two start positions, by dividing the PDCCH into two groups, so that PDCCHs occupied by PDCCHs including multiple CCEs are occupied.
  • the ACK channel that is not actually used can also be used by the PDCCH of other users, so that more users can be scheduled in the case of the same number of CCEs and the number of ACK channels, and the waste of CCE and ACK channel resources is reduced.
  • An embodiment of the present invention further provides a PDCCH receiving apparatus, including:
  • the PDCCH detecting unit performs blind detection on the received control signal according to the PDCCH allocation rule, that is, detects the transmitted PDCCH, and determines the allocated PDCCH.
  • An embodiment of the present invention further provides an ACK/NACK channel transmitting apparatus, as shown in FIG. 16, including:
  • ACK Index ( N CCE - CCE — Index ) IN CCE — per Module 3
  • ACK_Index ⁇ + (CCE Index - ⁇ 1 ) / Module 4
  • ACK_Index ⁇ ⁇ + (SI - CCE Index) I
  • N module XI For implementing the CCE set in the first group of PDCCHs, the corresponding correspondence is: sequence number, + 1 , +2 ", +3 +1 ,..., + ( ⁇ _ 1 ) " CCE in turn with serial number Corresponding to the ACK/NACK channel; expressed as:
  • ACK Index ⁇ ⁇ + (CCE Index - Si) / f M , where CCE Index indicates the sequence number of the CCE corresponding to the ACK/NACK channel; the format in the first group of PDCCH is The ACK/NACK channel corresponding to the PDCCH of the f 1+1 1+2 ... takes the ACK channel corresponding to the CCE included in the PDCCH; when there are multiple, the ACK/NACK channel corresponding to the smallest or largest CCE is taken;
  • the module 12 is configured to implement the CCE set in the second group of PDCCHs, where the corresponding relationship is: the sequence number is 2 , -3 , ..., - (the CCE corresponds to the following ACK/NACK channel: first Priority, ACK/NACK channel that cannot be used by PDCCH corresponding to ⁇ , "second priority, ACK/NACK channel that cannot be used by pDccH of N CCE per in 3 G !, but does not include occupation
  • the ACK/NACK channel corresponding to the PDCCH channel of the CCE with N CCE per f 1+2
  • ACK/NACK channel in turn recursive; and, cannot correspond to an ACK/NACK channel corresponding to a CCE allocated before it;
  • N ACK indicates the number of reserved ACK channels
  • ACK_Index indicates the ACK/NACK channel number corresponding to the user, 0 ⁇ ACK - l n d ex ⁇ N ⁇ - 1
  • N CCE per PDCCH indicates the format of the PDCCH
  • CCE - Index indicates the sequence number of the first CCE allocated in the PDCCH, 0 ⁇ CCE_ Index ⁇ N CC£ -1 .
  • a 4 indicates the starting ACK/NACK channel number corresponding to the first group of PDCCHs, 0 ⁇ 4 ⁇ -1;
  • a 2 represents a starting ACK/NACK channel number corresponding to ⁇ of the second group of PDCCHs, ⁇ U , 4 ⁇ ;
  • S1 respectively, indicating a fixed start in the CCE set relative to the first group of PDCCHs and the second group of PDCCHs.
  • the ACK/NACK channel learning unit 110 is configured to learn the allocated ACK/NACK channel by using the detected PDCCH according to the ACK/NACK channel corresponding to the PDCCH provided by the corresponding information providing unit 100.
  • An ACK/NACK channel transmitting unit 120 configured to map ACK/NACK information to
  • the ACK/NACK channel learning unit 110 learns the allocated ACK/NACK channel and transmits it.
  • the aforementioned specific correspondence may be expressed by a formula or may be stored in a corresponding table.
  • the corresponding information providing unit specifically includes one or more modules, and each module implements a specific specific correspondence, which is consistent with the description in the foregoing embodiments, and details are not described herein.
  • An embodiment of the present invention further provides an ACK/NACK channel receiving apparatus, as shown in FIG. 17:
  • the corresponding information providing unit 200 is configured to provide a specific correspondence between the PDCCH and the reserved ACK/NACK channel. This unit has the same structure as the corresponding information providing unit in the ACK/NACK channel transmitting apparatus, and will not be described again here.
  • the ACK/NACK channel learning unit 210 learns the allocated ACK/NACK channel by using the detected PDCCH according to the ACK/NACK channel and the PDCCH corresponding relationship provided by the corresponding information providing unit 200.
  • the ACK/NACK channel receiving unit 220 learns from the ACK/NACK channel learning unit 210 that the ACK/NACK information transmitted by the transmitting end is received on the allocated ACK/NACK channel.
  • Such an ACK/NACK channel acquisition means may be a chip or a logic module that implements its functions.
  • the ACK/NACK channel acquiring apparatus obtains the sequence number of the ACK/NACK channel of the receiving side according to the number of CCEs included in the PDCCH and the sequence number of the CCE allocated first in the PDCCH, and does not need to display the ACK/NACK channel.
  • Information the implementation process is simple, thereby reducing the waste of communication resources of the system.
  • the embodiment of the present invention further provides a base station, including a PDCCH allocation device 10, a scheduling device 20, a mapping device 30, an ACK/NACK channel transmitting device 40, and an ACK/NACK channel receiving device 50.
  • the PDCCH allocation device 10 is connected to the scheduling device 20 and the mapping device 30, and the scheduling device 20 is configured to determine which users and their PDCCHs are scheduled to be sent to the PDCCH allocation device 10; the PDCCH allocation device 10 is configured to send the allocated CCEs to The mapping device 30 is transmitted by the antenna after being mapped to the physical resource block.
  • the PDCCH allocation apparatus 10 further includes an allocation unit and a grouping unit.
  • the allocation unit allocates a CCE to the physical downlink control channel PDCCH of the scheduling user to be transmitted according to the PDCCH group information provided by the grouping unit, in descending order of the format of each PDCCH.
  • a candidate PDCCH is allocated, and a candidate PDCCH is allocated to a scheduling user, where the format indicates that the PDCCH includes the number of CCEs.
  • An ACK/NACK channel transmitting apparatus 40 configured to PDCCH according to an ACK/NACK channel
  • the specific correspondence relationship is obtained by using the PDCCH allocation information to learn the corresponding allocated ACK/NACK channel, and the ACK/NACK channel is mapped to the allocated ACK/NACK channel and transmitted to the terminal.
  • the ACK/NACK channel receiving apparatus 50 is configured to learn, according to a specific correspondence between the ACK/NACK channel and the PDCCH, the corresponding allocated ACK/NACK channel by using the PDCCH allocation information, and receive the ACK sent by the terminal from the allocated ACK/NACK channel. /NACK information.
  • the embodiment of the present invention further provides a terminal, including a demapping device 60, a blind detecting device 70, an ACK/NACK channel transmitting device 80, and an ACK/NACK channel receiving device 90;
  • the demapping device 60 is connected to the blind detecting device 70, and is configured to demap the physical signals received by the terminal to obtain signals on the CCEs, and send the signals on the CCEs to the blind detecting device 70, and the blind detecting device 70 also respectively.
  • the ACK/NACK channel receiving device 90 and the ACK/NACK channel transmitting device 80 are connected to perform blind detection on the obtained signals on each CCE to obtain a PDCCH allocated by the base station to itself, and the CCE sequence number information included in the allocated PDCCH.
  • the ACK/NACK channel receiving device 90 is used for the sequence number of the CCE included in the allocated PDCCH according to the blind detecting device, and the PDCCH and the reserved ACK/ Corresponding relationship between NACK channels is used to learn the allocated ACK/NACK channel, and ACK/NACK information is mapped to the allocated ACK/NACK channel for transmission to the base station;
  • ACK/NACK channel transmitting device 80 is used for allocation according to the blind detection device The sequence number of the CCE included in the PDCCH, and the correspondence between the PDCCH and the reserved ACK/NACK channel, the allocated ACK/NACK channel, the slave allocation ACK / NACK information ACK / NACK channel received from the base station.
  • the serial number of the CCE is a logical serial number, and the order of the serial numbers can be changed to obtain another feasible solution.
  • the CCE number can be changed from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 to 0, 1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 15, 8, 9, 10, 11, the ACK/NACK channel number corresponding to the CCE sequence does not change, and another feasible solution is obtained.
  • the system when performing CCE allocation, may combine CCEs into all candidate PDCCHs in various formats in advance. For example, for 16 CCEs, two 8 CCE PDCCHs may be combined, respectively, by CCE. – 0 ⁇ CCE 7 and CCE—8 ⁇ CCE—15 are combined, and 4 PDCCHs of 4 CCEs can be combined, respectively, from CCE—0 to CCE—3. CCE—4 ⁇ CCE—7, CCE—8 ⁇ CCE—11, CCE—12 ⁇ CCE—15 are combined.
  • the CCE to be transmitted is allocated to the PDCCH to be transmitted, which is equivalent to selecting the corresponding candidate PDCCH from the candidate PDCCHs of the various formats pre-combined by the CCE as the PDCCH to be transmitted, and the CCE included in the selected candidate PDCCH is allocated to be transmitted.
  • CCE of the PDCCH For example, there are currently two PDCCHs to be transmitted, and the format is divided into 8 CCEs and 4 CCEs, and the candidate PDCCHs combined by CCE—0 to CCE 7 and CCE—8 to CCE 11 are selected as the PDCCH to be transmitted.
  • the candidate PDCCHs may be divided into two groups according to the format, and the candidate PDCCHs of various formats are sequentially combined in a specific order starting from the set fixed start CCE.
  • the allocation indication of other types of physical channels (such as a data channel, a power control channel, a pilot channel, and the like), that is, the allocation through the physical channel A, and the physical channel A and
  • the correspondence between the physical channels B implicitly indicates the allocation of the physical channels B.
  • the PDCCH allocation method provided by the embodiment of the present invention can effectively reduce the number of PDCCH blind detections by using the PDCCH allocation method separately, in addition to the ACK channel allocation indication to reduce ACK/NACK channel resource waste, because the PDCCH is grouped by format and from The fixed initial CCE starts to perform CCE allocation of the PDCCH.
  • the detection may start from the fixed starting CCE of the PDCCH of this format.
  • the embodiment of the present invention further provides a readable computer medium, such as an optical disk, a floppy disk, a magnetic disk, etc., which, when in operation, performs the methods in the foregoing embodiments.
  • a readable computer medium such as an optical disk, a floppy disk, a magnetic disk, etc.

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Abstract

L'invention concerne un procédé d'allocation d'un canal PDCCH. Le procédé consiste à : diviser le canal de commande de liaison descendante physique (PDCCH) en deux ensembles conformément à un format PDCCH planifié ; définir un élément de canal de commande (CCE) parmi les éléments de canal de commande allouables en tant que CCE de début constant pour chaque ensemble ; allouer un CCE pour chaque ensemble des ensembles PDCCH, en commençant respectivement par ledit CCE de début constant. Le mode de réalisation de l'invention concerne aussi un procédé d'indication pour l'allocation d'un canal d'acquittement/non acquittement (ACK/NACK), un dispositif d'allocation d'un PDCCH, un dispositif pour envoyer un canal ACK/NACK, un dispositif pour recevoir un canal ACK/NACK, une station de base et un terminal utilisant le dispositif pour envoyer un canal ACK/NACK et le dispositif pour recevoir un canal ACK/NACK. Ce mode de réalisation permet d'indiquer de façon rétrograde l'allocation de canal ACK/NACK et de réduire le gaspillage de ressources de canaux de communication.
PCT/CN2008/072200 2007-08-31 2008-08-29 Procédé et dispositif d'allocation de canal de commande et d'indication d'allocation de canal ack/nack WO2009030168A1 (fr)

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