WO2011134350A1 - Procédé et dispositif pour déterminer des espaces de recherche sur porteuse composante de canal de contrôle de liaison descendante physique - Google Patents

Procédé et dispositif pour déterminer des espaces de recherche sur porteuse composante de canal de contrôle de liaison descendante physique Download PDF

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Publication number
WO2011134350A1
WO2011134350A1 PCT/CN2011/072763 CN2011072763W WO2011134350A1 WO 2011134350 A1 WO2011134350 A1 WO 2011134350A1 CN 2011072763 W CN2011072763 W CN 2011072763W WO 2011134350 A1 WO2011134350 A1 WO 2011134350A1
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Prior art keywords
pdsch
pdcch
user equipment
bit
activation state
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PCT/CN2011/072763
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English (en)
Chinese (zh)
Inventor
赵亚利
许芳丽
谌丽
杨晓东
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电信科学技术研究院
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Publication of WO2011134350A1 publication Critical patent/WO2011134350A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and a device for determining a PDCCH CC search space. Background technique
  • LTE Long Term Evolution
  • 3G 3rd Generation
  • the UE User Equipment
  • the maximum maximum bandwidth of the cell is 20MHz.
  • the service capacity of end users grows exponentially.
  • rate In order to meet the increasing demand of end users, it is necessary to provide more bandwidth to meet the higher peaks required by end users' services and applications. rate.
  • LTE-Advanced LTE-Advanced
  • the peak rate of the system is greatly improved compared to LTE. If only one cell with a maximum bandwidth of 20 MHz is used, the peak rate requirement cannot be achieved.
  • each aggregated cell may include a pair of uplink and downlink component carriers (Component Carriers), or may only include one unidirectional carrier.
  • Component Carriers Uplink and downlink component carriers
  • each of the aggregated Member carrier charges up to 20MHz. As shown in FIG.
  • the downlink physical channel includes: a PDSCH (Physical Downlink Shared Channel), a PBCH (Physical Broadcast Channel), a PMCH (Physical Multicast Channel), and a PCFICH ( Physical Control Format Indicator Channel, Physical Layer Control Information Format (Channel), PDCCH (Physical Layer Control Channel), PHICH (Physical Hybrid ARQ Indicator Channel).
  • PDSCH Physical Downlink Shared Channel
  • PBCH Physical Broadcast Channel
  • PMCH Physical Multicast Channel
  • PCFICH Physical Control Format Indicator Channel
  • Physical Layer Control Information Format Channel
  • PDCCH Physical Layer Control Channel
  • PHICH Physical Hybrid ARQ Indicator Channel
  • the PDCCH channel is mainly used for transmitting scheduling signaling for uplink and downlink
  • the PDSCH channel is mainly used for downlink data transmission.
  • a component carrier has both a PDCCH channel and a PDSCH channel, and both Divided by the time domain, as shown in the PDCCH and PDSCH channel diagrams shown in FIG.
  • the PDCCH on the downlink carrier corresponding to the cell can only schedule the PDSCH of the local cell.
  • the PDCCH on one cell is contaminated (as the interference on the PDCCH channel is severe), at this time, it can be configured to be cross-carrier scheduling, that is, DL (downstream allowed) through other cells
  • the PDCCH of the CC schedules uplink and downlink data transmission of the current cell. It should be noted that when configuring cross-carrier scheduling, one cell can be scheduled by one PDCCH CC at the same time. The scheduling relationship is based on semi-static configuration of the cell.
  • the scheduling relationship between the PDCCH and the PDSCH shown in FIG. 4 may be referred to as a PDSCH-only CC for a DL CC whose PDCCH is contaminated or cannot be used.
  • the PDSCH on CC2 cannot be scheduled by the PDCCH on CC2. But can be PDCCH scheduling on CC1.
  • the base station can configure a working cell set for the UE according to the sum of the maximum rates of all services requested by the UE, and the device is called a CC set.
  • the multi-carrier system selects one CC as the PCC (primary component carrier) of the UE, and the cell where the PCC is located is the PCell (Primary Cell) and configures the carrier set.
  • the other CCs are the SCC (secondary component carrier) of the UE, and the cell where the SCC is located is the SCdl (Secondary Cell).
  • the PCC of different UEs may be different.
  • the PCC of the UE is not allowed to be activated or deactivated.
  • the PCC is always activated by default, and the SCC configuration in the CC set is configured to be deactivated by default. If these SCCs are needed, the Carrier activation operation is performed on the SCC. Since the service of the UE may be volatility and bursty, that is, the traffic volume is small during a certain period of time, and the traffic volume is large during a certain period of time, when the UE traffic is relatively small, in order to better save power, it is required.
  • the CC in the CC set is configured to perform carrier activation or deactivation according to the current service condition of the UE, and for the deactivated carrier, the UE does not need to monitor the PDCCH again, so that a better power saving effect can be achieved.
  • MAC CE MAC control element
  • bitmap bit mapping
  • each bit (bit) corresponds to one CC (due to The PCC will not be activated/deactivated. There may be a separate bit for the PCC, or no. If a bit is set to 0, it means that the corresponding CC is deactivated. If a bit is set to 1, it means activation.
  • Implicit deactivation uses the deactivation timer. If the deactivation timer expires, the corresponding CC is deactivated. It should be noted that carrier activation/deactivation is for the downlink. For SCC, there is currently no carrier activation/deactivation operation for the uplink CC.
  • An embodiment of the present invention provides a method and a device for determining a PDCCH CC search space, to determine a search space of a PDCCH CC according to an activation state of a PDSCH CC when a PDSCH CC carrier is deactivated.
  • the embodiment of the present invention provides a method for determining a PDCCH CC search space, including:
  • the user equipment acquires an activation state of the PDSCH CC, and determines a search space of the PDCCH CC according to the activation state of the PDSCH CC.
  • An embodiment of the present invention provides a user equipment UE, including:
  • An obtaining module configured to acquire an activation state of the PDSCH CC
  • a determining module configured to determine a search space of the PDCCH CC according to the activation state of the PDSCH CC acquired by the acquiring module.
  • the present invention has at least the following advantages:
  • the search space of the PDCCH CC is determined according to the activation state of the PDSCH CC, and the search space can be adjusted in time to achieve the purpose of reducing the unnecessary number of PDCCH blind detections and more effectively saving power.
  • FIG. 1 is a schematic diagram of only one carrier in a cell in a prior art LTE system
  • 2 is a schematic diagram of a carrier aggregation technology in the prior art LTE-A
  • FIG. 3 is a schematic diagram of a PDCCH and a PDSCH channel in the prior art
  • FIG. 4 is a schematic diagram of a scheduling relationship between a PDCCH and a PDSCH in the prior art
  • FIG. 5 is a schematic flowchart of a method for determining a PDCCH CC search space according to Embodiment 1 of the present invention
  • FIG. 6 is a schematic flowchart of a method for determining a PDCCH CC search space according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic flowchart of a method for determining a PDCCH CC search space according to Embodiment 3 of the present invention.
  • FIG. 8 is a schematic diagram of a format of a MAC CE in Embodiment 3 of the present invention.
  • FIG. 9 is a schematic flowchart of a method for determining a PDCCH CC search space according to Embodiment 4 of the present invention.
  • FIG. 10 is a schematic diagram of a format of a MAC CE in Embodiment 4 of the present invention.
  • FIG. 11 is a block diagram of a cell number according to a cell level in the fifth embodiment of the present invention.
  • FIG. 12 is a schematic diagram of correspondence between each bit bit and CC according to UE level CC number in Embodiment 5 of the present invention.
  • 13 is a fifth embodiment of the present invention for numbering bits from low to high according to frequency
  • Figure 14 is a fifth embodiment of the present invention for numbering bits from high to low according to frequency
  • FIG. 15 is a schematic structural diagram of a user equipment according to Embodiment 6 of the present invention. detailed description
  • the UE in order to increase the peak rate, the UE can work on multiple component carriers, and the multi-carrier system allocates the UE according to the sum of the average rates of services requested by the UE.
  • a set of working carriers is set, and since the service of the UE may be volatility and bursty, when the traffic of the UE is relatively small, for better power saving, the carrier in the working carrier set configured for the UE may be further configured according to the current UE.
  • the carrier case performs a carrier deactivation operation.
  • a method for interacting between a PDCCH CC and a PDSCH CC when a carrier of a multi-carrier system is deactivated is proposed, and a search space of the PDCCH CC is determined according to an activation state of the PDSCH CC.
  • a first embodiment of the present invention provides a method for determining a PDCCH CC search space. As shown in FIG. 5, the method includes the following steps:
  • Step 501 The user equipment acquires an activation state of the PDSCH CC.
  • Step 502 The user equipment determines a search space of the PDCCH CC according to an activation state of the PDSCH CC.
  • the acquiring, by the user equipment, the activation status of the PDSCH CC includes: receiving, by the user equipment, a carrier activation/deactivation MAC CE from the network side device, and acquiring an activation status of the PDSCH CC according to the indication information in the MAC CE.
  • the acquiring, by the user equipment, the activation status of the PDSCH CC according to the indication information in the MAC CE includes: the user equipment acquiring the bit bit corresponding to the PDSCH CC, and when the bit position corresponding to the PDSCH CC is the deactivation indication, the user equipment acquires the activation of the PDSCH CC. The status is deactivated.
  • determining a search space of the PDCCH CC according to the activation state of the PDSCH CC includes: when the activation state of the PDSCH CC is deactivated, the user equipment searches for a search space corresponding to the transmission mode on the PDCCH CC and the scheduled activated PDSCH CC Performing blind detection on the control channel on the PDCCH CC.
  • the user equipment performs blind detection on the control channel on the PDCCH CC according to the search space corresponding to the transmission mode on the PDCCH CC and the scheduled activated PDSCH CC, including: when the PDCCH CC and the PDSCH CC If the search space is not independent, when the control channel on the PDCCH CC is blindly checked, if The scheduling signaling for the deactivated PDSCH CC is detected on the PDCCH CC, and the user equipment ignores the scheduling signaling for the PDSCH CC.
  • the mapping between the bit bit and the CC includes: mapping according to the CC number of the cell level; or mapping based on the CC number of the UE level; or according to the frequency of the CC Perform mapping; or signal the CC and the carrier to deactivate the correspondence of each bit in the MAC CE.
  • the method further includes: deactivating, by the user equipment, the CC according to an activation status of the PDSCH CC.
  • the user equipment deactivates the CC according to the activation state of the PDSCH CC, and specifically includes one or any of the following operations: the user equipment stops monitoring the PDCCH on the corresponding DL CC; the user equipment terminates in the corresponding DL.
  • the PDSCH is received on the CC; if there is a deactivated timer running on the CC, the user equipment stops the timer; the user equipment terminates the uplink transmission only on the UL CC scheduled by the CC; the user equipment terminates for the corresponding DL CC Downlink CQI feedback; if a certain UL CC can only be scheduled by the CC, the user equipment terminates the SRS and/or PHR transmission on the UL CC.
  • the search space of the PDCCH CC is determined according to the activation state of the PDSCH CC, and the search space can be adjusted in time to achieve the purpose of reducing unnecessary PDCCH blind detection times and more effective power saving.
  • the network side device includes, but is not limited to, an eNB (evolved Node B), a relay, and the like. It should be noted that the network side device is not limited to the foregoing device, and all devices located on the network side. All of the embodiments of the present invention are described by taking a base station as an example for convenience of description.
  • the activation state of the PDSCH CC affects the PDCCH CC Specifically, if one PDSCH CC is deactivated, the impact on the search space needs to be considered when performing blind detection on the PDCCH that can schedule the PDSCH CC.
  • the user equipment when the activation state of the PDSCH CC is deactivated, the user equipment performs blind detection on the control channel on the PDCCH CC according to the search space corresponding to the transmission mode on the PDCCH CC and the scheduled activated PDSCH CC. Further, when the search space of the PDCCH CC and the PDSCH CC are not independent, and the control channel on the PDCCH CC is blindly detected, if the scheduling signaling for the deactivated PDSCH CC is detected on the PDCCH CC, the user equipment ignores the PDSCH for the PDSCH. Scheduling signaling for CC.
  • the method includes the following steps:
  • Step 601 The network side device sends a carrier activation/deactivation MAC CE to the UE.
  • a bit bit corresponding to the PDSCH CC may be included, and the bit bit is set as a deactivation indication or an activation indication.
  • Step 602 The user equipment activates/deactivates the MAC CE according to the carrier to acquire an activation state of the PDSCH CC.
  • the active state of the PDSCH CC is deactivated; the bit corresponding to the PDSCH CC is activated.
  • the activation status of the PDSCH CC is acquired as active. For example, when the bit position is 0, the deactivation indication is indicated, and when the bit position is 1, the activation indication is displayed, when the user equipment knows that the bit is 0, the activation state of the PDSCH CC is deactivated; the user equipment knows that When the bit is 1, the activation status of the PDSCH CC is activated.
  • the carrier activation/deactivation MAC CE may not carry the bit bit corresponding to the PDSCH CC.
  • the user equipment may obtain the activation state of the PDSCH CC in other manners. I will not repeat them in detail.
  • Step 603 When the activation state of the PDSCH CC is deactivated, the user equipment determines the search space of the PDCCH CC according to the activation state of the PDSCH CC. That is, the user equipment performs blind detection on the PDCCH scheduling the PDSCH CC according to the search space of the PDCCH CC.
  • the user equipment when the activation state of the PDSCH CC is deactivated, the user equipment performs blind detection on the control channel on the PDCCH CC according to the search space corresponding to the transmission mode on the PDCCH CC and the scheduled activated PDSCH CC. Further, when the search space of the PDCCH CC and the PDSCH CC are not independent, and the control channel on the PDCCH CC is blindly detected, if the scheduling signaling for the deactivated PDSCH CC is detected on the PDCCH CC, the user equipment ignores the PDSCH for the PDSCH. Scheduling signaling for CC.
  • the user equipment needs to perform a deactivation operation on the CC, where the operation after the CC is deactivated includes at least one or any of the following operations. : Stop listening to the PDCCH on the DL CC; if there is a deactivated timer running on the CC, stop the timer; stop the PDSCH transmission on the DL CC (including initial transmission and/or retransmission); ignore the DL CC before UL scheduling (including initial transmission and/or retransmission); stopping transmitting CQI (Channel Quality Indicator) information corresponding to the DL CC on the UL CC; if a certain UL CC can only be scheduled by the DL CC Then, the SRS (Sounding Reference Signal) and/or PHR (Power headroom) transmission are stopped on the corresponding UL CC.
  • CQI Channel Quality Indicator
  • bitmap mode can be used in the carrier activation/deactivation MAC CE.
  • mapping between the bit and the CC can be at least one of the following ways.
  • each bit of the carrier activation/deactivation MAC CE corresponds to one CC.
  • PCC since the PCC will not be activated/deactivated, there may be a separate bit corresponding to the PCC, or there may be no independent bit corresponding to the PCC.
  • the method for determining the PDCCH CC search space proposed by the embodiment of the present invention is described in detail below with reference to a specific application scenario.
  • the multi-carrier system supports three DL CCs, which are recorded as CC1, CC2, and CC3.
  • CC1 and CC3 are both PDCCH CCs and CC2 is PDSCH-only CCs.
  • CC1 is configured with cross-carrier scheduling.
  • CC3 does not have cross-carrier scheduling.
  • the carrier activation/deactivation MAC CE has three reserved bits, and the lowest 5 bits correspond to 5 DL CCs in order from lower to upper respectively; “0" is activated/deactivated in MAC CE Activated, "1" indicates activation.
  • the third embodiment of the present invention provides a method for determining a PDCCH CC search space.
  • the search spaces of CC1 and CC2 are independent.
  • the method includes the following steps:
  • Step 701 At time T1, the UE performs normal data transmission on DL CC1, CC2, and CC3.
  • Step 702 At time T2, the CC1 channel quality is deteriorated or the UE data volume is decreased.
  • the network side decides to deactivate CC2, and the base station sends a carrier activation/deactivation MAC CE to the UE.
  • the format of the carrier activation/deactivation MAC CE is as shown in FIG. 8. The lowest bit represents CC1, the second last bit represents CC2, and the third last bit represents CC3.
  • Step 703 After receiving the carrier activation/deactivation MAC CE, the UE determines that CC2 should be deactivated.
  • Step 704 When the UE performs blind detection on the PDCCH on the CC1, the UE does not need to perform blind detection in the search space corresponding to the CC2 transmission mode.
  • CC1 is configured with cross-carrier scheduling
  • CC2 since CC2 is deactivated, in the process of blindly detecting the PDCCH on CC1, it is not necessary to perform blind detection in the search space corresponding to the CC2 transmission mode.
  • the fourth embodiment of the present invention provides a method for determining a PDCCH CC search space.
  • the search spaces of CC1 and CC2 are not independent.
  • the method includes the following steps:
  • Step 901 At time T1, the UE performs normal data transmission on DL CC1, CC2, and CC3.
  • Step 902 At time T2, the CC1 channel quality deteriorates or the UE data volume decreases, and the network side decides to deactivate CC2, the base station may send a carrier activation/deactivation MAC CE to the UE, and the format of the MAC CE is as shown in FIG.
  • the bit represents CC1
  • the second last bit represents CC2
  • the third last bit represents CC3.
  • Step 903 After receiving the carrier activation/deactivation MAC CE, the UE determines that CC2 should be deactivated.
  • Step 904 When performing blind detection on the PDCCH on CC1, the UE does not need to perform blind detection in the search space independently corresponding to CC2. When there is an overlapping part, if the scheduling for CC2 is detected, the scheduling is ignored.
  • CC2 is removed. If the PDCCH is blindly detected on the CC1, it is not necessary to perform blind detection in the search space independently corresponding to CC2. If there is an overlapping part, if the scheduling for CC2 is detected, the scheduling is ignored and no processing is performed. .
  • the fifth embodiment of the present invention provides a method for determining a PDCCH CC search space.
  • the MAC CE is transmitted in a bitmap manner. It is assumed that the UE aggregates five CCs, which are respectively recorded as CC1/CC2/CC3/CC4/CC5.
  • the five CCs correspond to 1, 3, 2, 4, and 5 respectively; according to the UE level CC number, the five CCs correspond to 1, 3, 5, 4, 2 respectively;
  • the low to high are CC1/CC3/CC2/CC4/CC5.
  • the carrier format of the carrier activation/deactivation MAC CE includes: (1) According to the cell level CC number, the correspondence between each bit of the carrier activation/deactivation MAC CE and the CC is as shown in FIG. 11; (2) According to the UE level CC number, the corresponding relationship between each bit of the carrier activation/deactivation MAC CE and the CC is as shown in FIG. 12; (3) The carrier activates/deactivates each bit of the MAC CE according to the frequency from low to high. The corresponding relationship with CC is shown in Fig. 13; (4) According to the frequency from high to low, the correspondence between each bit of the Bay ij carrier activation/deactivation MAC CE and CC is as shown in Fig. 14.
  • a user equipment provided in Embodiment 6 of the present invention includes:
  • the obtaining module 11 is configured to acquire an activation state of the PDSCH CC.
  • the determining module 12 is configured to determine a search space of the PDCCH CC according to the activation state of the PDSCH CC acquired by the acquiring module 11.
  • the acquiring module 11 is specifically configured to: receive a carrier activation/deactivation MAC CE from the network side device, and acquire an activation state of the PDSCH CC according to the indication information in the MAC CE.
  • the acquiring module 11 is further configured to acquire a bit corresponding to the PDSCH CC. Bit, when the bit position corresponding to the PDSCH CC is a deactivation indication, acquiring an activation state of the PDSCH CC as deactivation.
  • the determining module 12 is specifically configured to: when the activation state of the PDSCH CC is deactivated, according to a search space corresponding to a transmission mode on the PDCCH CC and the scheduled activated PDSCH CC, on the PDCCH CC
  • the control channel is blinded.
  • the determining module 12 is further configured to: when the PDCCH CC and the search space of the PDSCH CC are not independent, perform blind detection on the control channel on the PDCCH CC, if it is detected on the PDCCH CC The scheduling signaling of the activated PDSCH CC ignores the scheduling signaling for the PDSCH CC.
  • the mapping between the bit bit and the CC includes: mapping according to the CC number of the cell level; or mapping based on the CC number of the UE level; or mapping according to the frequency of the CC; or The signaling CC and the carrier are used to deactivate the correspondence between each bit in the MAC CE.
  • the user equipment further includes: a processing module 13, configured to: when the activation state of the PDSCH CC is deactivated, deactivate the CC according to an activation state of the PDSCH CC.
  • the processing module 13 is specifically configured to: perform one or any of the following operations: stop monitoring the PDCCH on the corresponding DL CC; terminate PDSCH reception on the corresponding DL CC; if there is a deactivated timer on the CC If the operation is performed, the timer is stopped; the uplink transmission on the UL CC that can only be scheduled by the CC is terminated; the downlink CQI feedback is terminated for the corresponding DL CC; if a certain UL CC can only be scheduled by the CC, the UL is terminated. SRS and/or PHR transmission on the CC.
  • modules of the device of the present invention may be integrated or integrated.
  • the above modules can be combined into one module, or can be further split into multiple sub-modules.
  • the state determines the search space of the PDCCH CC, and can adjust the search space in time to achieve the purpose of reducing unnecessary PDCCH blind detection times and more effective power saving.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

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

Abstract

La présente invention concerne un procédé et un dispositif pour déterminer des espaces de recherche sur une porteuse composante de canal de contrôle de liaison descendante physique (« Physical Downlink Control CHannel Component Carrier » ou PDCCH CC). Le procédé comprend les étapes suivantes : un équipement utilisateur obtient l'état d'activité d'une porteuse composante de canal partagé de liaison descendante physique (« Physical Downlink Shared CHannel Component Carrier » ou PDSCH CC), et selon l'état d'activité de la PDSCH CC, détermine les espaces de recherche sur la PDCCH CC. Dans la présente invention, il est possible de déterminer des espaces de recherche sur une PDCCH CC selon l'état d'activité d'une PDSCH CC, les espaces de recherche peuvent être réglés à temps, réduisant ainsi un décodage aveugle de PDCCH inutile et permettant de réaliser des économies de puissance plus efficaces.
PCT/CN2011/072763 2010-04-30 2011-04-14 Procédé et dispositif pour déterminer des espaces de recherche sur porteuse composante de canal de contrôle de liaison descendante physique WO2011134350A1 (fr)

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