WO2014043890A1 - Procédé pour la transmission de données de contrôle, équipement d'utilisateur et station de base - Google Patents

Procédé pour la transmission de données de contrôle, équipement d'utilisateur et station de base Download PDF

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Publication number
WO2014043890A1
WO2014043890A1 PCT/CN2012/081746 CN2012081746W WO2014043890A1 WO 2014043890 A1 WO2014043890 A1 WO 2014043890A1 CN 2012081746 W CN2012081746 W CN 2012081746W WO 2014043890 A1 WO2014043890 A1 WO 2014043890A1
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WIPO (PCT)
Prior art keywords
aggregation level
control channel
downlink control
physical downlink
area
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PCT/CN2012/081746
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English (en)
Chinese (zh)
Inventor
张健
王轶
张翼
徐月巧
周华
Original Assignee
富士通株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 富士通株式会社 filed Critical 富士通株式会社
Priority to PCT/CN2012/081746 priority Critical patent/WO2014043890A1/fr
Priority to CN201280074422.2A priority patent/CN104396326A/zh
Publication of WO2014043890A1 publication Critical patent/WO2014043890A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • Control information transmission method user equipment, and base station
  • the present invention relates to the field of communications, and in particular, to a method for transmitting control information, a user equipment, and a base station. Background technique
  • a physical downlink control channel (PDCCH, Physical Downlink Control CHannel) is used to transmit control signaling to a user equipment (UE, User Equipment) to implement downlink transmission allocation, uplink transmission assignment, power control, paging, and system information. , random access and other functions.
  • PDCCH Physical Downlink Control channel
  • UE User Equipment
  • the inventors have found that in the existing solution, in order to limit the control channel overhead to a certain range, the PDCCH of the high aggregation level and the PDCCH of the low aggregation level generate a control channel element (CCE, Control Channel Element). Coincidence means a possible collision between PDCCHs, which will cause blocking of the control channel to some extent.
  • CCE Control Channel Element
  • ePDCCH enhanced physical downlink control channel
  • ePDCCH enhanced PDCCH
  • its inherent characteristics allow a new search space structure to be adopted, and the blocking probability can be further reduced without adding additional overhead.
  • the embodiment of the invention provides a method for transmitting control information, a user equipment and a base station, and aims to reduce the blocking rate of the control channel without generating additional control channel overhead.
  • a method for transmitting control information includes:
  • the base station sends configuration information of the centralized enhanced physical downlink control channel to the user equipment, where the centralized enhanced physical downlink control channel resource region configured by the configuration information includes a first aggregation level region and a second aggregation level region, where The aggregation level included in the second aggregation level area can occupy one or more physical resource block pairs;
  • the base station sends the centralized enhanced physical downlink control channel to the user equipment.
  • a method for transmitting control information includes:
  • the user equipment receives the configuration information of the centralized enhanced physical downlink control channel sent by the base station, where the area of the centralized enhanced physical downlink control channel resource configured by the configuration information includes a first aggregation level area and a second aggregation level area, The aggregation level included in the second aggregation level area can occupy one or more physical resource block pairs;
  • the user equipment detects the search space to receive the centralized enhanced physical downlink control channel sent by the base station in the centralized enhanced physical downlink control channel resource configured by the configuration information.
  • a base station includes: a first sending unit, configured to send configuration information of a centralized enhanced physical downlink control channel to a user equipment, where the configuration information is configured
  • the area of the physical enhanced downlink control channel resource includes a first aggregation level area and a second aggregation level area, where the aggregation level included in the second aggregation level area can occupy one or more physical resource block pairs;
  • the second sending unit sends the centralized enhanced physical downlink control channel to the user equipment.
  • a user equipment is provided, where the user equipment includes:
  • the first receiving unit receives the configuration information of the centralized enhanced physical downlink control channel sent by the base station, where the centralized enhanced physical downlink control channel resource region configured by the configuration information includes the first aggregation level area and the second aggregation level An area, where the second aggregation level area includes an aggregation level that can occupy one or more physical resource block pairs;
  • the centralized enhanced physical downlink control configured in the configuration information Within the channel resource, the search space is detected to receive the centralized enhanced physical downlink control channel sent by the base station.
  • a communication system comprising a base station as described above, and a user equipment as described above.
  • a computer readable program wherein when the program is executed in a user equipment, the program causes a computer to perform transmission of control information as described above in the user equipment method.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute a transmission method of control information as described above in a user equipment.
  • a computer readable program wherein when the program is executed in a base station, the program causes a computer to execute a transmission method of control information as described above in the base station.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a transmission method of control information as described above in a base station.
  • the beneficial effects of the embodiments of the present invention are that, by dividing the area where the resources of the centralized enhanced physical downlink control channel are located into the high aggregation level area and the low aggregation level area, the blocking rate of the control channel can be reduced, and no additional control channel is generated. Overhead.
  • 1 is a schematic diagram of a logical structure of a CCE of a PDCCH
  • FIG. 2 is a schematic flow chart of a transmission method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a logical structure of an eCCE of an ePDCCH according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of ePDCCH overhead comparison according to an embodiment of the present invention
  • FIG. 5 is a diagram showing an example of a search space configuration according to an embodiment of the present invention.
  • FIG. 6 is still another example diagram of a search space configuration according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a centralized ePDCCH and a distributed PDCCH collision
  • FIG. 8 is a schematic diagram of a regional configuration of a centralized ePDCCH and a distributed ePDCCH according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of still another area configuration of a centralized ePDCCH and a distributed ePDCCH according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of still another area configuration of a centralized ePDCCH and a distributed ePDCCH according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of still another area configuration of a centralized ePDCCH and a distributed ePDCCH according to an embodiment of the present invention
  • FIG. 12 is a diagram showing an example of configuration of a centralized ePDCCH and a distributed ePDCCH physical resource according to an embodiment of the present invention
  • FIG. 13 is still another schematic flowchart of a transmission method according to an embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 15 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. detailed description
  • one PDCCH is composed of a number of control channel elements (CCEs), and the number of different CCEs corresponds to different aggregation levels (AL, Aggregation Level) of the PDCCH.
  • CCEs control channel elements
  • A Aggregation Level
  • Table 1 shows the PDCCH aggregation level and the number of CCEs.
  • the UE blindly checks several PDCCH candidates and attempts to demodulate the PDCCH that is actually sent to itself.
  • the relationship between the PDCCH aggregation level and the number of candidates (the number of blind detections) is shown in Table 2. All PDCCH candidates constitute the UE-specific search space of the UE (UE specific search space)
  • FIG. 1 is a schematic diagram of a logical structure of a PDCCH CCE given from a network side perspective, and the PDCCH search space concept can be illustrated by using the CCE logical structure of FIG. 1.
  • the numbers 0 to N indicate the CCE number, and N depends on the total PDCCH of all users scheduled in the current subframe.
  • the size of the total number of CCEs N determines the size of the PDCCH region, and the PDCCH region may occupy the first 1, 2, 3 or 4 OFDM symbols of the subframe.
  • a PDCCH with an aggregation level of L occupies L CCEs, and a starting position is located at an integer multiple CCE number of L.
  • the PDCCH start position of AL4 in FIG. 1 can only be located at the CCEs numbered 0, 4, 8 ⁇ , and the PDCCH of AL8 is not shown in FIG. 1, and is similarly available.
  • the UE can obtain the starting position of the PDCCH candidate by means of a hash function, and perform blind detection in the consecutive CCEs according to the candidate number shown in Table 2.
  • FIG. 1 actually shows the multiplexing structure of the PDCCH.
  • the PDCCH of the high aggregation level for example, AL4 or AL8
  • the PDCCH of multiple low aggregation levels for example, AL1 or 2
  • a PDCCH of a scheduled AL4 occupies 0 to 3 (£, then all PDCCHs of AL1 or AL2 that can occupy CCE transmissions of 0 to 3 will not be scheduled in this subframe, that is, blocked. Off, so blocking probability is also an important indicator of control channel design.
  • ePDCCH enhanced physical downlink control channels
  • the ePDCCH component is called an eCCE (enhanced CCE).
  • the ePDCCH can adopt the same idea as the PDCCH, and the ePDCCH candidate is still placed according to the structure of FIG.
  • the ePDCCH is transmitted in the Physical Downlink Shared CHannel (PDSCH) region, which makes the physical resource block pair not occupied by the ePDCCH still have a chance to be used for scheduling PDSCH transmission.
  • PDSCH Physical Downlink Shared CHannel
  • an enhanced physical control format indicator channel (ePCFICH) is used to dynamically adjust the control channel overhead, so the ePDCCH can Adopt a new search space structure.
  • ePCFICH enhanced physical control format indicator channel
  • the present invention is directed to a centralized transmission technology of an enhanced physical downlink control channel in an LTE-A system, and a new search space structure, a corresponding configuration method, and the like are proposed. The following describes the embodiments of the present invention in detail.
  • the embodiment of the invention provides a method for transmitting control information, which is applied to a base station side.
  • 2 is a schematic flowchart of a transmission method according to an embodiment of the present invention. As shown in FIG. 2, the transmission method includes:
  • Step 201 The base station sends configuration information of the centralized enhanced physical downlink control channel to the user equipment, where the area where the ePDCCH resource is configured includes the first aggregation level area and the second aggregation level area, where the second aggregation level area
  • the aggregation level contained within can occupy one or more physical resource block pairs.
  • Step 202 The base station sends a centralized enhanced physical downlink control channel to the user equipment.
  • the ePDCCH is a centralized ePDCCH, that is, one ePDCCH is located in one or more physical resource block pairs (PRB pairs) adjacent to each other.
  • PRB pairs physical resource block pairs
  • the configuration information of the ePDCCH is configured with an ePDCCH resource, that is, a physical resource block pair in which the user-specific search space is located.
  • an ePDCCH resource that is, a physical resource block pair in which the user-specific search space is located.
  • the first aggregation level area and the second aggregation level area may have no overlap or partial overlap on the actual physical resource mapping.
  • the aggregation level of the second aggregation level area will completely fill the physical resource block pair, so once the aggregation level is scheduled, there will be no wasted resource particles (RE, Resource Element); otherwise, no such When class scheduling, the physical resource block pair can be used for PDSCH transmission and does not constitute control channel overhead.
  • RE Resource Element
  • the first aggregation level area may be a low aggregation level area with an aggregation level of 1 and/or 2; the second aggregation level area may be a high aggregation level area with an aggregation level of 4 and/or 8, and the two areas occupy different Physical resources.
  • first aggregation level region and the second aggregation level region may have partial overlaps.
  • the network side may configure one low aggregation level area and one high aggregation level area for each UE.
  • the set is used as a centralized ePDCCH transmission, where KL sets are used to place low aggregation level candidates (such as AL1, AL2), K H sets are used to place high aggregation level candidates (such as AL4); for example, K can be configured for the UE.
  • KL+K h centralized ePDCCH sets KL+K h centralized ePDCCH sets, where KL sets are used to place low aggregation level candidates (such as AL1, AL2), and K H sets are used to place all aggregation level candidates (such as AL1, AL2, AL4), then Equivalent to K sets constitute a low aggregation level area, ⁇ ⁇ ⁇ constitute a high aggregation level area, and there are partial overlaps between high and low aggregation level areas.
  • the foregoing only describes the configuration methods of the first aggregation level area and the second aggregation level area, and the present invention is not limited thereto.
  • the following description only takes as an example where there is no overlap between the first aggregation level area and the second aggregation level area.
  • FIG. 3 is a schematic diagram of a logical structure of an eCCE of an ePDCCH according to an embodiment of the present invention, showing an eCCE set of all users observed from a network side perspective.
  • aggregation level 1, 2, 4 is taken as an example, AL8 can be promoted according to the AL4 idea.
  • the eCCE logical structure of the centralized ePDCCH uses eCCE numbers 0 to N, 0 to M. Different from the PDCCH, for the centralized ePDCCH, it can be divided into two ePDCCH regions according to the aggregation level.
  • the 6 ( ⁇ area of the label 0 ⁇ is only used to place the AL1 and AL2 ePDCCH candidates, so that the ePDCCH of the low aggregation level is multiplexed in one physical resource block; the eCCE area of the labels 0 to M is used to place the entire physical resource.
  • AL4 ePDCCH candidate for block pair is used to place the entire physical resource.
  • This search space configuration can completely avoid the collision of the AL4 candidate with the AL1 and AL2 candidates, thereby reducing the blocking probability of the ePDCCH.
  • M+1 eCCEs are reserved, there is no additional control channel overhead. This is because it can be seen as actually moving the AL4 ePDCCH that should be scheduled in the low aggregation level area to the high aggregation level area, so that an integer multiple of 4 eCCEs will be vacated in the low aggregation area, and these eCCEs just form several
  • the pair of physical resource blocks that are not utilized by the ePDCCH, according to the ePDCCH characteristics described above, may be reused by the PDSCH, for example, and thus do not constitute a control channel overhead.
  • FIG. 4 is a schematic diagram of ePDCCH overhead comparison according to an embodiment of the present invention.
  • each physical resource block pair is composed of 4 eCCEs.
  • the ePDCCH candidate location is placed along the PDCCH scheme, and 16 eCCEs are reserved, which can be occupied by the AL1, 2, and 4 candidates, and the ePDCCH candidate location is the same as that shown in FIG.
  • the ePDCCH of the present invention is adopted.
  • 32 eCCEs are reserved, of which 16 eCCEs can be used by AL1 and AL2, and 16 eCCEs additionally configured are dedicated to AL4 candidates.
  • the hatched graph indicates the centralized ePDCCH that is actually scheduled.
  • two AL1 ePDCCHs and one AL4 ePDCCH are scheduled. Since the unshaded physical resource block pairs are available for PDSCH transmission, only the physical resource block pairs in which the shadows are located constitute the control channel overhead.
  • the control channel overhead of the two methods is three physical resource block pairs. It can be seen that the additional configuration of the AL4 dedicated eCCE resource does not bring additional control channel overhead.
  • the AL1 and AL2 ePDCCHs have the same search space for Figures 4A and 4B, and the additional eCCE configured for AL4 can effectively reduce the blocking probability without introducing additional control channel overhead.
  • this search space configuration is suitable for centralized ePDCCH, but not for PDCCH. This is because even if there are unused CCEs in the PDCCH, they cannot be reused by the PDSCH, so configuring additional CCE resources will permanently bring control channel overhead.
  • the network side can configure a low aggregation level area and a high aggregation level area for the UE, and the independent configuration of the high and low aggregation level areas enables the system to have a higher degree of freedom to control the blocking probability.
  • the aggregation level can be distinguished by whether the ePDCCH aggregation level can fill a physical resource block pair. This feature ensures that no additional control channel overhead is introduced even if additional resources are reserved.
  • the UE can perform blind detection on ePDCCHs of different aggregation levels in different aggregation level areas.
  • the embodiment describes how to configure the ePDCCH resource for the user equipment on the network side from the perspective of the user.
  • the base station side sends the configuration information of the enhanced physical downlink control channel to the user equipment, and configures the ePDCCH resource on a per-user basis.
  • the configured ePDCCH resources include the first An aggregation level area and a second aggregation level area, wherein the second aggregation level area includes an aggregation level capable of occupying one or more physical resource block pairs. Since the configuration is performed on a per-user basis, multiple user equipments can share the first aggregation level area and the second aggregation level area.
  • the first aggregation level area and the second aggregation level area are multiple.
  • some user equipments may share a pair of first aggregation level areas and a second aggregation level area; another part of user equipments may share another pair of first aggregation level areas and second aggregation level areas.
  • FIG. 5 is a diagram showing an example of a search space configuration of an embodiment of the present invention.
  • N UEs share a pair of high and low aggregation level areas
  • M UEs share another pair of high and low, aggregation level areas, and so on, and the required aggregation level areas can be configured according to the number of UEs. .
  • multiple UEs share the same area, so that the UE can be multiplexed in the same area as much as possible, and fill the area to improve resource utilization efficiency. Assigning different areas to the UE enables the allocated resources to adapt to the UE. The increase in demand.
  • Figure 5 only shows an example configuration. Different UEs can also share a low aggregation level area, and different high aggregation level areas (such as UE K1 ⁇ Kn) are not listed one by one.
  • the configured high aggregation level area does not overlap with itself and the low aggregation level areas of all other UEs; from the network side perspective, all low aggregations in the system in the example of FIG.
  • the area and the high-aggregation area respectively occupy different physical resources, which is equivalent to the eCCE structure shown in FIG. 3. Therefore, no blocking collision occurs between the high-low aggregation level candidates, and according to the foregoing analysis, the additionally allocated high-aggregation level area is also Does not incur additional overhead.
  • the network side has the capability of independently configuring high and low aggregation level areas, which can add additional degrees of freedom and flexibility for scheduling, and the network side can flexibly grasp this configuration.
  • the network side can also be configured to partially overlap the high aggregation level area and the low aggregation level area, depending on network scheduling. Since each UE is independently configured, it can be ensured that at least some UEs have a high aggregation level region that does not overlap, thereby obtaining a reduction in the system blocking probability.
  • FIG. 6 is still another exemplary diagram of a search space configuration according to an embodiment of the present invention.
  • a common high aggregation level area can be defined, which will be monitored by all UEs configured with centralized ePDCCH. Since the area may need to accommodate control signaling of all UEs, more physical resource block pairs may be reserved in a common high aggregation level area, and unscheduled physical resource block pairs may be used by the PDSCH, so even if more Retaining resources will not bring waste of resources.
  • the network side configures a common high aggregation level area and a UE-specific low aggregation level area for the UE, and the UE blindly detects the high aggregation level candidate in the public high aggregation level area, and the UE is dedicated to the low aggregation level. Blind detection of low aggregation level candidates in the region.
  • the multiplexing of the distributed ePDCCH and the centralized ePDCCH is described in the embodiment of the present invention.
  • the configuration of the eCCE/PRB resource for the centralized ePDCCH of the high aggregation level is not only beneficial for reducing the blocking probability of the centralized ePDCCH, but also beneficially reducing the collision with the distributed ePDCCH.
  • the base station side sends the configuration information of the centralized enhanced physical downlink control channel, and the actual downlink control information (DCI, Downlink Control Indicator) to the user equipment side, and configures the centralized ePDCCH resource.
  • the configured ePDCCH resource includes a first aggregation level area and a second aggregation level area, where the aggregation level included in the second aggregation level area can occupy one or more physical resource block pairs, and the base station side sends the distribution to the user equipment side. Configuration information of the ePDCCH and DCI.
  • FIG. 7 is a schematic diagram of a centralized ePDCCH and a distributed PDCCH collision.
  • the high and low aggregation level regions are not independently configured for the centralized ePDCCH.
  • the four physical resource block pairs are configured as a distributed ePDCCH region, and the same four physical resource block pairs are also configured as a centralized ePDCCH region to provide a certain probability that the distributed and centralized ePDCCH can be reused. Within a physical resource block pair, thereby improving resource utilization efficiency.
  • the hatched pattern represents an ePDCCH candidate.
  • Figure 7 assumes that the network side is not The centralized ePDCCH independently configures the high and low aggregation level regions, so all the ePDCCH candidates (ALUs AL2, AL4) are located in the four physical resource block pairs, and there is a collision problem between the centralized AL4 candidates and the distributed ePDCCH candidates. Assuming that a distributed ePDCCH is scheduled, the ePDCCH will be spread across all four physical resource block pairs. As shown by the shading in the distributed ePDCCH region of Figure 7, the four enhanced resource groups (eREGs) of numbers 0, 4, 8, and 12 form a distributed ePDCCH.
  • eREGs enhanced resource groups
  • the collision problem between distributed ePDCCH and centralized ePDCCH high aggregation level candidates is a major problem affecting distributed and centralized ePDCCH multiplexing.
  • the network side can independently configure the high- and low-aggregation-level areas of the centralized ePDCCH, and the high-aggregation-level area can be configured to the resource locations that do not overlap with the distributed ePDCCH area (according to the scheduling situation, the partial handover may be partially performed.
  • the stacking but at least ensuring that the high aggregation level area of some UEs does not overlap with the distributed area, thereby avoiding collisions, and configuring the low aggregation level area to the resource location coincident with the distributed ePDCCH area, so as to fully exploit the distributed High resource utilization efficiency that can be achieved by multiplexing with centralized ePDCCH.
  • the area of the resource of the distributed enhanced physical downlink control channel does not overlap with the second aggregation level area.
  • FIG. 8 is a schematic diagram of a regional configuration of a centralized ePDCCH and a distributed ePDCCH according to an embodiment of the present invention, and a search space configuration scheme considering distributed and centralized ePDCCH multiplexing, which is equivalent to centralized in FIG. 5 .
  • the positional relationship with the distributed ePDCCH region is added based on the schematic representation of the ePDCCH high aggregation level region.
  • the high aggregation level area and the distributed ePDCCH area do not overlap to avoid collision blocking between different types of candidates; the low aggregation level area overlaps with the distributed ePDCCH area to support the distribution. Reuse of centralized EPDCCH to improve resource utilization.
  • FIG. 9 is a schematic diagram of still another area configuration of a centralized ePDCCH and a distributed ePDCCH according to an embodiment of the present invention, which is equivalent to the centralized ePDCCH high aggregation level area in FIG. Based on the location relationship with the distributed ePDCCH region is added.
  • the high aggregation level region does not overlap with the distributed ePDCCH region.
  • the area of the resource of the distributed enhanced physical downlink control channel includes a dedicated area and a common area; the common area does not overlap with the first aggregation level area or the second aggregation level area; the second aggregation The level area does not overlap with the public area or the dedicated area.
  • distributed ePDCCH in order to improve resource utilization efficiency, it may be divided into two types of areas: one is a common area, all UEs detect ePDCCH candidates therein, and the area can only multiplex distributed ePDCCH. To ensure maximum distributed transmission performance; additionally configure a UE-specific area, which is used when the capacity of the public area is insufficient, and the area can support centralized and distributed ePDCCH multiplexing.
  • FIG. 10 is a schematic diagram of still another area configuration of a centralized ePDCCH and a distributed ePDCCH according to an embodiment of the present invention.
  • FIG. 10 shows the configuration of the centralized ePDCCH search space, where the centralized high aggregation level region does not overlap with any distributed region to reduce collision blocking; the distributed public region does not Overlap with any centralized area to maximize distributed transmission performance;
  • the centralized low-aggregation level area can overlap with distributed UE-specific areas to support centralized and distributed ePDCCH multiplexing and improve resource utilization.
  • FIG. 11 is a schematic diagram of still another area configuration of a centralized ePDCCH and a distributed ePDCCH according to an embodiment of the present invention. Similarly, for the case where the centralized ePDCCH is configured with a common high aggregation level region, FIG. 11 shows the relationship with the distributed ePDCCH region.
  • FIG. 12 is a diagram showing an example of centralized ePDCCH and distributed ePDCCH physical resource configuration according to an embodiment of the present invention, corresponding to the logical resource allocation of FIG. 10.
  • An example of the configuration in real physical resources is shown in Figure 12 with respect to the logical resource configuration given above. Similar to the physical resources of other logical allocations, no longer listed.
  • Each RBG Resource Block Group
  • each SB Subband
  • Each area allocated for the ePDCCH is filled with one RBG as much as possible, so that the impact on the PDSCH resource allocation is minimized, and the impact on the PDSCH transmission of the lower version UE is also reduced.
  • the same four physical resource block pairs are allocated to the distributed ePDCCH UE-specific area and the centralized ePDCCH low-aggregation level area to support multiplexing.
  • the centralized ePDCCH high aggregation level area and the distributed ePDCCH common area independently occupy the overlapping physical resource block pairs.
  • Embodiment 3 On the basis of Embodiment 3, the multiplexing of the distributed ePDCCH and the centralized ePDCCH is described in the embodiment of the present invention.
  • the base station sends the configuration information of the centralized enhanced physical downlink control channel to the user equipment, configures the ePDCCH resource, and then performs the actual ePDCCH transmission.
  • the area where the configured ePDCCH resource is located includes the first aggregation level area and the second aggregation level area, where the aggregation level included in the second aggregation level area can occupy one or more physical resource block pairs.
  • the base station also sends a distributed enhanced physical downlink control channel to the user equipment, and the distributed ePDCCH configuration information needs to be sent first.
  • the ePDCCH type to be detected may include three cases: only blind detection of distributed ePDCCH, only blind detection of centralized ePDCCH, simultaneous blind detection centralized and Distributed ePDCCH.
  • the ePDCCH set may be used to implement the configuration of the high- and low-aggregation areas of the centralized ePDCCH, for example, configuring two centralized ePDCCH sets for the UE, and configuring the first set as the low-aggregation-level area and the second set as the high-aggregation-level area. .
  • three ePDCCH sets are configured for the UE: the first set is a first aggregation level area of the centralized ePDCCH, the second set is a second aggregation level area of the centralized ePDCCH, and the third set is a distributed enhanced type.
  • the UE that obtains this configuration needs to simultaneously blindly check centralized and distributed in the same subframe.
  • ePDCCH at this time, the UE performs only blind detection of the AL8 candidate for the distributed ePDCCH, and the ePDCCH set including the AL8 may be located inside the distributed ePDCCH common area, in order to obtain multiplexing with other distributed ePDCCH, and the UE is for the centralized ePDCCH.
  • a blind check of AL1, AL2, and AL4 candidates is required.
  • two ePDCCH sets are configured for the UE: Both sets are used as centralized ePDCCH transmission, the first set is a first aggregation level area, and the second set is a second aggregation level area.
  • the UE in this configuration only blindly detects the centralized ePDCCH. It is assumed that the UE only blindly checks AL1, AL2, and AL4. Therefore, the number of blind detections assigned to AL4 can be increased to four times. If it is assumed that the UE blindly checks all AL1, AL2, AL4, and AL8. Then, the number of blind detections of 6, 6, 2, 2 is still followed to ensure that the total number of blind detections is unchanged, and the second set contains candidates of AL4 and AL8 as high aggregation level regions.
  • two ePDCCH sets are configured for the UE: Both sets are used for distributed ePDCCH transmission, so the UE only blindly detects the distributed ePDCCH, and the number of blind detections of the traditional 6, 6, 2, 2 can be two. Each set is equally divided, and each set contains ePDCCH candidates of AL1, 2, 4, 8.
  • Table 3 shows the above situation. It is to be noted that the above is merely illustrative, but the invention is not limited thereto.
  • ePDCCH low aggregation level area (high aggregation level area)
  • Simultaneous blind detection ePDCCH set first set second set flute two A p ⁇ ⁇ Zhukou distribution and division
  • blind detection frequency allocation 6, 6 2 2 It can be seen from the foregoing embodiment that the configuration of the centralized ePDCCH high and low aggregation level area can be implemented by using the ePDCCH set. As described above, the configuration can reduce the blocking rate of the control channel and does not generate additional control channel overhead.
  • Example 5
  • FIG. 13 is a schematic flowchart of a transmission method according to an embodiment of the present invention. As shown in FIG. 13, the transmission method includes:
  • Step 1301 The user equipment receives the configuration information of the centralized enhanced physical downlink control channel sent by the base station, where the centralized enhanced physical downlink control channel resource area configured by the configuration information includes the first aggregation level area and the second aggregation. a level region, where the second aggregation level region includes an aggregation level that can occupy one or more physical resource block pairs;
  • Step 1302 The user equipment detects the search space in the configured centralized enhanced physical downlink control channel resource to receive the centralized enhanced physical downlink control channel sent by the base station.
  • the first aggregation level area is a low aggregation level area with an aggregation level of 1 and/or 2; and the second aggregation level area is a high aggregation level area with an aggregation level of 4 and/or 8.
  • step 1302 when the user equipment performs blind detection on the high aggregation level, the user equipment does not perform the search in the low aggregation level area; and vice versa, when the user equipment performs blind detection on the low aggregation level. , will not be retrieved in the high aggregation level area.
  • first aggregation level region and the second aggregation level region partially overlap.
  • the enhanced physical downlink control channel is a centralized enhanced physical downlink control channel.
  • the transmission method may further include: the user equipment receiving the distributed enhanced physical downlink control channel sent by the base station.
  • the enhanced physical downlink control channel resource may be configured into three sets: the first set is the first aggregation level area of the centralized ePDCCH, the second set is the second aggregation level area of the centralized ePDCCH, and the third set is distributed.
  • the user equipment in this configuration simultaneously detects the centralized enhanced physical downlink control channel and the distributed enhanced physical downlink control channel.
  • the number of detections of aggregation level 1 in the first set is 6, the number of detections of aggregation level 2 in the first set is 6, the number of detections of aggregation level 4 in the second set is 2; the number of detections of aggregation level 8 in the third set is 2.
  • the enhanced physical downlink control channel can be configured into two sets: the two sets are used as the centralized ePDCCH transmission, the first set is the first aggregation level area, and the second set is the second aggregation level area;
  • the user equipment in this configuration only detects the centralized enhanced physical downlink control channel.
  • the number of detections of aggregation level 1 in the first set is 6, the number of detections of aggregation level 2 in the first set is 6, and the number of detections of aggregation level 4 in the second set is 4.
  • the enhanced physical downlink control channel can be configured in two sets: Both sets are used as distributed ePDCCH transmission, and the user equipment in this configuration only detects the distributed enhanced physical downlink control channel.
  • the detection times of the aggregation levels 1, 2, 4, and 8 in the first set are respectively 3, 3, 1, and 1, and the detection times of the aggregation levels 1, 2, 4, and 8 in the second set are 3, 3, respectively. 1, 1, 1.
  • the centralized enhanced physical downlink control channel resource is divided into a high aggregation level area and a low aggregation level area, so the user-specific search space is also independently configured according to the aggregation level, and the search space is performed according to the aggregation level.
  • the separation of physical resources can reduce the blocking rate of the control channel and does not generate additional control channel overhead.
  • the embodiment of the present invention provides a base station, which corresponds to the transmission method of the control information of the embodiments 1 to 4, and the same content is not described herein again.
  • FIG. 14 is a schematic diagram showing the structure of a base station according to an embodiment of the present invention.
  • the base station 1400 includes: a first sending unit 1401 and a second sending unit 1402; other parts of the base station 1400 may refer to the prior art, and details are not described herein again.
  • the first sending unit 1401 is configured to send, to the user equipment, the configuration information of the enhanced physical downlink control channel, where the centralized ePDCCH resource location configured by the configuration information includes a first aggregation level area and a second aggregation level area, where The aggregation level contained in the second aggregation level area occupies one or more physical resource block pairs.
  • the second sending unit 1402 is in the configuration After being effective, the centralized enhanced physical downlink control channel is sent to the user equipment.
  • the enhanced physical downlink control channel is a centralized enhanced physical downlink control channel.
  • the first sending unit 1401 is further configured to send, to the user equipment, configuration information of a distributed enhanced physical downlink control channel, where the second sending unit
  • the 1402 can also be used to send a distributed enhanced physical downlink control channel to the user equipment.
  • the embodiment of the present invention further provides a user equipment, which corresponds to the method for transmitting control information of Embodiment 5, and the same content is not described herein again.
  • FIG. 15 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the base station 1500 includes: a first receiving unit 1501 and a second receiving unit 1502; other parts of the user equipment 1500 may refer to the prior art, and details are not described herein again.
  • the first receiving unit 1501 receives the configuration information of the centralized enhanced physical downlink control channel sent by the base station, where the centralized ePDCCH resource region configured by the configuration information includes a first aggregation level region and a second aggregation level region, where The aggregation level included in the second aggregation level area occupies one or more physical resource block pairs.
  • the second receiving unit 1502 detects the search space in the configured ePDCCH resource to receive the centralized enhanced physical downlink control sent by the base station. channel.
  • the first receiving unit 1501 is further configured to receive configuration information of the distributed enhanced physical downlink control channel sent by the base station, where the second receiving unit 1502 is further configured to receive the distributed enhanced physical downlink control sent by the base station. channel.
  • the embodiment of the present invention further provides a communication system, where the communication system includes the base station as described in Embodiment 6, and the user equipment as described in Embodiment 7.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to execute a transmission method of the control information as described in Embodiments 1 to 4 above in the base station .
  • the embodiment of the invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the transmission method of the control information described in the above embodiments 1 to 4 in the base station.
  • the embodiment of the invention further provides a computer readable program, wherein when executed in the user equipment When the program is executed, the program causes the computer to execute the transmission method of the control information as described in Embodiment 5 above in the user equipment.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the transmission method of the control information described in Embodiment 5 above in the user equipment.
  • the above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or a step.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.
  • One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé adapté pour transmettre des données de contrôle. L'invention se rapporte d'autre part à un équipement d'utilisateur et à une station de base. Le procédé de transmission selon l'invention comprend les étapes suivantes : une station de base transmet des données de configuration relatives à un canal de commande physique sur la liaison descendante amélioré et centralisé, à un équipement d'utilisateur ; une zone dans laquelle se trouve la ressource de canal de commande physique sur la liaison descendante amélioré et centralisé, qui est configuré conformément aux données de configuration, comprend une première zone de niveaux d'agrégation et une seconde zone de niveaux d'agrégation ; et les niveaux d'agrégation contenus dans la seconde zone de niveaux d'agrégation occupent complètement une ou plusieurs paires de blocs de ressources physiques. La mise en œuvre des modes de réalisation de la présente invention permet : de réduire le taux de blocage d'un canal de contrôle ; et d'empêcher la génération supplémentaire d'un surdébit de canal de commande.
PCT/CN2012/081746 2012-09-21 2012-09-21 Procédé pour la transmission de données de contrôle, équipement d'utilisateur et station de base WO2014043890A1 (fr)

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CN201280074422.2A CN104396326A (zh) 2012-09-21 2012-09-21 控制信息的传输方法、用户设备以及基站

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WO2018141091A1 (fr) * 2017-02-04 2018-08-09 华为技术有限公司 Procédé d'émission d'informations, procédé de réception d'informations, et dispositif
WO2018230902A1 (fr) * 2017-06-13 2018-12-20 엘지전자 주식회사 Procédé de réception de canal de commande de liaison descendante et dispositif associé
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TWI689193B (zh) * 2018-04-01 2020-03-21 財團法人資訊工業策進會 用於行動通訊系統之基地台及使用者裝置

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