WO2015184588A1 - Nœud à faible puissance, système de communication, et procédé de transmission d'informations - Google Patents

Nœud à faible puissance, système de communication, et procédé de transmission d'informations Download PDF

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Publication number
WO2015184588A1
WO2015184588A1 PCT/CN2014/079088 CN2014079088W WO2015184588A1 WO 2015184588 A1 WO2015184588 A1 WO 2015184588A1 CN 2014079088 W CN2014079088 W CN 2014079088W WO 2015184588 A1 WO2015184588 A1 WO 2015184588A1
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WIPO (PCT)
Prior art keywords
base station
information
macro
cell
small power
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PCT/CN2014/079088
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English (en)
Chinese (zh)
Inventor
李红涛
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480029976.XA priority Critical patent/CN105324969B/zh
Priority to PCT/CN2014/079088 priority patent/WO2015184588A1/fr
Publication of WO2015184588A1 publication Critical patent/WO2015184588A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Definitions

  • the embodiments of the present invention relate to the field of wireless communications, and in particular, to a small power base station, a communication system, and an information transmission method. Background technique
  • the 4th generation communication system uses the homogenous network (Homogeneous Network) used in the original 2/2. 5, 3rd generation communication system. Based on the Heterogeneous Network (HetNet) system.
  • HetNet Heterogeneous Network
  • Different types of wireless networks can be included in HetNet, for example: Hot spot coverage is provided by multiple Femto base stations, picocell (Pico) base stations or micro-cell (Micro) base stations within the coverage of a macro base station.
  • HetNet Heterogeneous Network
  • Different types of wireless networks can be included in HetNet, for example: Hot spot coverage is provided by multiple Femto base stations, picocell (Pico) base stations or micro-cell (Micro) base stations within the coverage of a macro base station.
  • different types of base stations have different transmission powers and coverage ranges.
  • the macro base station has a transmission power of several tens of watts and a large coverage area, which is called a high power base station; a femtocell base station, a picocell base station or a microcell base station.
  • the transmit power and coverage are relatively small and can be collectively referred to as the Lower Power Node (LPN).
  • LPN Lower Power Node
  • HetNet can be deployed in a variety of ways, such as HetNet based on centralized baseband deployment and HetNet in non-baseband centralized deployment.
  • the macro base station and the LPN are deployed in different locations, and the macro base station and the LPN exchange information through the inter-station information transmission channel. Since the macro base station and the LPN are deployed separately, the bandwidth and delay requirements of the inter-station information transmission channel are relatively high, especially when the inter-station information transmission channel is a non-dedicated channel, and the problem of large information transmission delay is particularly prominent.
  • the embodiment of the invention provides a small power base station, a system and an information transmission method, which can improve the information processing speed of the small power base station.
  • the embodiment of the present invention provides a small power base station, where the heterogeneous network includes the small power base station and a macro base station that covers the small power base station, and the small power base station
  • the information receiving unit is configured to acquire cell level information of the macro cell carried on a physical broadcast channel PBCH of a macro cell managed by the macro base station;
  • a scheduling information acquiring unit configured to acquire, according to a cell radio network temporary identifier CRNTI that matches a user equipment UE in a macro cell, and the cell level information, the UE that is carried on a physical downlink control channel PDCCH channel of the macro cell Upstream scheduling information.
  • the information receiving unit accesses the macro base station by using a radio link, maintaining the same as the downlink direction of the macro cell, acquiring the physical cell of the macro cell.
  • the identifier PCI the PCI is used to identify whether the received PBCH belongs to the macro cell.
  • the cell-level information includes: at least, a physical hybrid automatic retransmission indication, by the macro cell, a resource block RB distribution occupied by the channel i3 ⁇ 4ICH;
  • the scheduling information acquiring unit obtains, by the scheduling information acquiring unit, the uplink scheduling information of the UE that is carried on the physical downlink control channel PDCCH of the macro cell, according to the CRNTI and the cell level information,
  • the scheduling information acquiring unit parses the physical control format indication channel PCFICH of the macro cell according to the RB distribution of the raicH, acquires a control format pointer CFI in the PCFICH, and determines that the PDCCH of the macro cell is in a sub
  • the downlink control information DCI in the PDCCH is extracted, and the uplink scheduling information of the UE UE included in the DCI in the DCI0 format is parsed.
  • the foregoing small power base station further includes: a receiving unit, configured to acquire, by the macro base station, a CRNTI of the UE in the macro cell, where
  • the information includes a CRNTI that matches the UE.
  • the scheduling information acquiring unit is further configured to: traverse a CRNTI interval of a CRNTI that may match the UE in each transmission time interval TTI period, to obtain the CRNTI.
  • the baseband processing unit is configured to process an uplink transmit signal of the UE according to uplink scheduling information of the UE, including uplink interference signal cancellation, and/or The macro base station performs uplink coordinated multi-point transmission CoMP.
  • the information receiving unit and the medium radio frequency transceiver unit are configured to maintain radio frequency isolation, including independently deploying an antenna for the information receiving unit, where the information receiving unit uses the The antenna receives the cell level information from the macro base station.
  • an embodiment of the present invention provides a communication system, including a small power base station, and a macro base station that covers the small power base station, where the small power base station includes an information receiving processing unit and a medium radio frequency transceiver unit, where The information receiving and processing unit accesses the macro base station through a wireless link, and the information receiving and processing unit and the medium frequency transceiver unit maintain a radio frequency isolation;
  • the information receiving processing unit Obtaining, by the information receiving processing unit, the cell level information of the macro cell carried on a physical broadcast channel PBCH of the macro cell managed by the macro base station;
  • the small power base station Obtaining, by the small power base station, the UE that is carried on the physical downlink control channel PDCCH of the macro cell according to the cell radio network temporary identifier CRNTI and the cell level information that are matched with the user equipment UE in the macro cell.
  • Uplink scheduling information ;
  • the macro base station is configured to provide the cell level information to the information receiving processing unit.
  • an embodiment of the present invention provides an information transmission method, which is applied to a heterogeneous network, where the heterogeneous network includes a small power base station and a macro base station that covers the small power base station, where the small power base station includes information.
  • a receiving unit, and a medium radio frequency transceiver unit wherein the information receiving processing unit accesses the macro base station through a wireless link, and the information receiving processing unit and the medium radio frequency transceiver unit maintain a radio frequency isolation, the method include,
  • the information receiving processing unit Obtaining, by the information receiving processing unit, the cell level information of the macro cell carried on a physical broadcast channel PBCH of the macro cell managed by the macro base station;
  • the small power base station Obtaining, by the small power base station, the UE that is carried on the physical downlink control channel PDCCH of the macro cell according to the cell radio network temporary identifier CRNTI and the cell level information that are matched with the user equipment UE in the macro cell. Upstream scheduling information.
  • the small power base station acquires, by using the information receiving processing unit, a cell level of the macro cell carried on a physical broadcast channel PBCH of a macro cell managed by the macro base station Before the information, further information includes:
  • the information receiving and processing unit After receiving the macro base station by using the radio link, the information receiving and processing unit maintains the same as the downlink direction of the macro cell, and acquires a physical cell identifier PCI of the macro cell, where the PCI is used to identify the received Whether the PBCH belongs to the macro cell.
  • the cell-level information includes: at least the physical hybrid automatic retransmission indication of the resource block RB distribution occupied by the channel i3 ⁇ 4ICH of the macro cell;
  • the small power base station Obtaining, by the small power base station, the uplink scheduling information of the UE that is carried on the physical downlink control channel PDCCH of the macro cell according to the CRNTI of the UE in the macro cell and the cell level information,
  • Parsing a physical control format indication channel (PCFICH) of the macro cell Parsing a physical control format indication channel (PCFICH) of the macro cell, acquiring a control format pointer CFI in the PCFICH, and determining the macro cell according to the RB distribution of the raicH.
  • the downlink control information DCI in the PDCCH is extracted from the PDCCH in the PDCCH, and the uplink scheduling information of the macro cell UE included in the DCI in the DCI0 format is parsed.
  • the CRNTI is obtained by the small power base station from the macro base station, and the small power base station receives the macro base station and sends the information to the office through an inter-station transmission channel.
  • User access information of the small power base station the user access information is used to instruct the small power base station to process the PDCCH of the UE, and the user access information includes a CRNTL that matches the UE.
  • the CRNTI is obtained by the baseband processing unit of the small power base station and forwarded to the information receiving processing unit;
  • the method further includes: the small power base station processing, according to uplink scheduling information of the UE, an uplink transmit signal of the UE, including uplink interference signal cancellation, and/or Or performing uplink coordinated multi-point transmission CoMP with the macro base station.
  • the information receiving processing unit and the medium radio frequency transceiver unit maintain radio frequency isolation, and independently deploy an antenna for the information receiving processing unit, where the information receiving and processing unit The cell level information is received from the macro base station using the antenna.
  • the technical solution disclosed in the embodiment of the present invention is applied to a heterogeneous network in which the baseband is not centrally deployed, and the information receiving and processing unit that can separately access the macro base station is set in the small power base station, and the information receiving and processing unit directly receives and processes the macro base.
  • the broadcast channel of the station and the physical downlink control channel are used to quickly obtain the uplink scheduling information of the user equipment that accesses the macro cell, so that the small power base station can perform the uplink interference signal cancellation and signal merging and other subsequent processing processes according to the uplink scheduling information, thereby improving the subsequent processing flow.
  • the information processing speed of the small power base station enhances system performance.
  • FIG. 1 is a heterogeneous network networking scenario applied to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a small power base station according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a small power base station according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart diagram of an information transmission method according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram of a communication system according to an embodiment of the present invention. detailed description
  • the technical solution provided by the embodiment of the present invention is applicable to various communication systems that can adopt a heterogeneous network networking manner, for example, a Wideband Code Division Multiple Access (WCDMA) system, and time division code division multiple access ( Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, Long-Term Evolution (LTE) system and communication system of LTE subsequent evolution.
  • WCDMA Wideband Code Division Multiple Access
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • LTE Long-Term Evolution
  • the base station according to the embodiment of the present invention may be a Node B (Node-B) in a WCDMA or TD-SCDMA system, or an evolved Node B (e-NodeB, evolved NodeB) in an LTE communication system, or a LTE subsequent evolved A similar base station device in a communication system.
  • Node-B Node B
  • e-NodeB evolved Node B
  • LTE communication system LTE subsequent evolved
  • the user equipment may communicate with one or more core networks via a Radio Access Network (RAN), for example, the UE may be a mobile phone or a computer with a mobile terminal.
  • RAN Radio Access Network
  • the user device can also be portable, pocket-sized, Handheld, computer built-in or in-vehicle mobile devices that exchange voice and/or data with a wireless access network.
  • the embodiment of the present invention defines that the unidirectional communication link from the base station to the UE is the downlink, and the unidirectional communication link from the UE to the base station is the uplink.
  • the minimum bearer unit of the physical layer data may be a resource element (Resource Element, RE), and one RE may be composed of one subcarrier in the frequency domain and one symbol (Symbol) in the time domain.
  • the bearer unit of the physical layer data may further include, for example, a Resource Block (RB).
  • RB Resource Block
  • one RB may include 12 consecutive subcarriers, each of which can occupy a bandwidth of 15 kHz, that is, one RB can occupy a bandwidth of 180 kHz; in the time domain, one RB can include seven consecutive symbols.
  • FIG. 1 is a schematic diagram of a heterogeneous network networking scenario according to an embodiment of the present invention.
  • a macro base station eNB, a small power base station LPN, and an eNB are independently deployed with the LPN, and data transmission between the two devices exists.
  • the channel can perform information exchange, for example, it can be a fiber transmission channel or a microwave transmission channel, which is not specifically limited in the present invention.
  • the area covered by the eNB is called macro cell (Macro Cel l ), which is used to meet the mobility and seamless coverage of the UE; LPN-1 is used as a supplement to the coverage of the eNB, and the coverage is smaller in the macro cell range.
  • the hotspot area is called a micro cell or a small cell (Smal l Cel l ).
  • the UE After the UE enters the macro cell, it can access the eNB and acquire communication services.
  • the UE that is in the macro cell range and accesses the eNB is simply referred to as a macro cell UE.
  • the uplink signal of the macro cell UE to the LPN is enhanced one by one, and the LPN can perform interference on the uplink signal by receiving the uplink scheduling information of the macro cell UE.
  • the processing such as signal combining is eliminated, and the communication quality of the macro cell UE is enhanced.
  • the embodiment of the present invention provides a small power base station as shown in FIG. 2, which may be applied to a heterogeneous network, where the heterogeneous network includes the small power base station and a macro base station that covers the small power base station,
  • the low power base station includes an information receiving unit 101, a scheduling information acquiring unit 102, and a medium radio frequency transceiver unit. 103.
  • the information receiving unit 101 accesses the macro base station by using a wireless link, and the information receiving unit 101 and the medium radio frequency transceiver unit 103 maintain radio frequency isolation.
  • the information receiving unit 101 has the capability of performing wireless communication with the macro base station, and can access the macro station as a user of the macro base station, establish a wireless link connection with the macro base station, and perform data transmission through a process of cell signal detection, signaling interaction, and the like. .
  • the information receiving unit 101 can refer to a normal UE design and be set as a special terminal inside the small power base station.
  • the medium radio frequency transceiver unit 103 and the information receiving unit 101 need to be kept in the radio frequency isolation. Therefore, the antenna of the information receiving unit 101 and the radio frequency of the information receiving unit 101 can be separately configured.
  • the port can be connected to the antenna using a radio frequency cable.
  • the medium-frequency transceiver unit 103 is used for signal transmission and reception, and its function is the same as that of the transceiver of the base station in the prior art, and details are not described herein.
  • the information receiving unit 101 receives the common channel information such as PBCH, PDCCH, and the like transmitted from the macro base station using the antenna.
  • antenna In order to avoid the interference of the radio frequency transceiver unit 103 and ensure that the information receiving unit 101 can accurately access the expected macro base station and normally receive the common channel information such as the PBCH and the PDCCH sent by the processing macro base station, it is necessary to consider the reasonable deployment of the information receiving unit 101.
  • antenna when deploying an antenna, reference may be made to the surrounding environment, for example, along a backhaul or power line of the small power base station, and away from the antenna coverage corresponding to the medium RF transceiver unit 103; or using a high gain directional small antenna.
  • the deployment manner of the antenna is not particularly limited, and the antenna lobes are disposed in a weaker area.
  • the information receiving unit 101 may perform, for example, setting the information receiving unit 101 to continuously send a data transmission request to the macro cell corresponding to the macro base station, so that the information receiving unit 101 may resident the macro. Cell, avoid cell handover. At the same time, the information receiving unit 101 can maintain the same as the downlink direction of the macro cell after accessing the macro base station, and acquire the macro cell.
  • the physical cell identifier (PCI) distinguishes signals from different cells and receives information carried by the common channel of the macro cell.
  • the information receiving unit 101 is configured to acquire cell level information of the macro cell carried on a physical broadcast channel (Physical Broadcast Channel, PBCH) of the macro cell managed by the macro base station.
  • PBCH Physical Broadcast Channel
  • the information receiving unit 101 accesses the macro base station by using a radio link, and receives and demodulates the PBCH of the macro cell, and acquires cell level information of the macro cell carried on the PBCH, including a physical hybrid automatic retransmission indicator channel (Physical Hybrid ARQ Indicator). Channel, PHICH) System information such as the resource block (RB) distribution and the number of antenna ports in the cell.
  • a physical hybrid automatic retransmission indicator channel Physical Hybrid ARQ Indicator
  • Channel, PHICH Physical Hybrid ARQ Indicator
  • the macro cell broadcasts the same system information to all UEs in the cell through the PBCH, and the information receiving unit 101, as a user of the macro base station, can directly and quickly acquire the above system information through the wireless link.
  • the scheduling information acquiring unit 102 is configured to acquire, according to the cell radio network temporary identifier CRNTI and the cell level information that match the user equipment UE in the macro cell, the bearer carried on the physical downlink control channel PDCCH channel of the macro cell. Uplink scheduling information of the UE.
  • the CRNTI is a type of Radio Network Temporary Identifier (RNTI), and is applicable to the cell on the common channel of the cell.
  • RNTI Radio Network Temporary Identifier
  • Each UE has a unique matching CRNTI in one cell. Used to distinguish between different UEs.
  • the CRNTI may be added as a special identifier in the Protocol Data Unit (PDU) header of the MAC layer to distinguish different UEs, and the CRNTI is generally 16 bits.
  • PDU Protocol Data Unit
  • the PDCCH can carry downlink control information (Downl ink Control Information,
  • DCI may include resource allocation information and other control information on multiple UEs. Specifically, it includes downlink data transmission scheduling information, uplink data transmission scheduling information, and uplink power control commands.
  • DCI formats include DCI0, DCI 1/1A/1B/1C, DCI2, DCI3/3A, and so on.
  • the DCI in the DCI0 format is used to send the resource allocation information of the uplink channel (Synchronization Channel, SCH), that is, the uplink scheduling information of the macro cell UE, and the other DCI format carries the downlink data transmission. Transmission scheduling information and uplink power control commands.
  • the control channel resource unit used by the PDCCH is a CCE, and the PDCCH may be transmitted on one or more consecutive CCEs. Generally, there may be multiple PDCCHs in one subframe.
  • the scheduling information acquiring unit 102 may parse the PCFICH according to the PHICH, and determine, by using a Control Format Indicator (CFI) defined in the PCFICH, that the PDCCH is occupied in one subframe. The number and distribution of symbols.
  • the PDCCH occupies a reference signal (Reference Signal, RS), a Physical Control Format Indicator Channel (PCFICH), a PHICH, and the like, and the distribution and content of the PCFICH are included in the PDCCH.
  • RS Reference Signal
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical Control Format Indicator Channel
  • the PHICH distribution can also be determined by the PCFICH, and the distribution of the RS depends on the number of antenna ports broadcasted in the PBCH. According to this, other information in the symbols occupied by the PDCCH can be removed, and the distribution of the PDCCH is determined, that is, the REs that all PDCCHs can occupy in one subframe are determined.
  • the scheduling information acquiring unit 102 may extract the DCI on the relevant RB according to the RB position of the PDCCH resource mapping, and then solve the RB position corresponding to the macro cell UE according to the CRNTI of the specific macro cell UE.
  • the uplink scheduling information belonging to the UE of the macro cell that is, the DCI of the DCI0 format, is called.
  • the scheduling information acquiring unit 102 may perform a CRC check on the PDCCH by using a CRNTI corresponding to the specific macro cell UE. If the CRC check succeeds, the information carried on the PDCCH is matched with the macro cell UE. In the meantime, since the information that the scheduling information acquiring unit 102 expects to receive is the DCI of the DCI0 format, the specific content of the DCI0 format information can be parsed only by decoding the PDCCH using the CRNTI scrambling code by using the DCI0 format that may occur. Obtaining uplink scheduling information of the macro cell UE.
  • the radio frequency transceiver unit 103 may be configured to acquire, from the macro base station, a CRNTI of the UE in the macro cell, including: receiving, by the macro base station, an inter-station transmission channel.
  • the scheduling information acquiring unit is configured to process a PDCCH of the UE, where the user access information includes a CRNTI that matches the UE.
  • the macro base station can identify a macro cell UE that may cause uplink interference to the small power base station.
  • the macro station connects the user of the CRNTI including the macro cell UE through the inter-station information transmission channel.
  • the incoming information is sent to the corresponding small power base station, received by the medium frequency transceiver unit 103, and forwarded to the scheduling information processing unit 102, and the scheduling information processing unit 102 parses out the CRNTI in which the specific UE matches.
  • the extension of the short time of the transmission does not have a negative impact on the use of the CRNTI by the small power base station. Therefore, the information transmission method in the prior art can be used to save the system computing resources, which is not specifically limited in the embodiment of the present invention.
  • the scheduling information acquiring unit 102 may be further configured to traverse a CRNTI that may match the UE in each Transmit Time Interval (TTI) period.
  • TTI Transmit Time Interval
  • the CRNTI interval acquires the CRNTI.
  • the scheduling information acquiring unit 102 traverses the CRNTI interval in which the CRNTI information of the macro cell UE may appear, and matches the PDCCH one by one.
  • the information receiving unit 101 traverses the entire CRNTI interval specified by the existing protocol, that is, 0 to 65536.
  • the scheduling information acquiring unit 102 maintains the entire CRNTI interval according to its own data processing capability. A subset is then traversed only during each TTI cycle, and the subset can be deleted and updated according to system health.
  • the traversal here refers to performing CRC check on each CNRTI in the entire interval or a certain subset and the received PDCCH, and selecting a CRNTI that matches the macro cell UE, thereby acquiring the macro cell UE carried on the PDCCH.
  • the manner of obtaining the uplink scheduling information in the uplink scheduling information is described in the foregoing embodiment, and details are not described herein.
  • the traversal mode is used to obtain the CRNTI of the macro cell UE, and the macro base station does not need to send the user access information of the macro cell UE to the small power base station, and the restriction on the inter-station transmission channel is smaller, so that the erection of the small power base station is more flexible.
  • the small power base station may further include the baseband unit (BBU) 104, and may be configured to process, according to the uplink scheduling information of the macro cell UE, an uplink transmit signal of the macro cell UE, including uplink interference. Signal cancellation, and/or uplink coordinated coordinated multi-point transmission (CoMP) with the macro base station.
  • BBU baseband unit
  • the scheduling information acquiring unit 102 may send the acquired uplink scheduling information of the macro cell UE to the baseband processing unit 104.
  • the data information interaction channel is provided between the scheduling information obtaining unit 102 and the baseband processing unit 104, and the data information interactive channel has a short transmission delay, which can meet the requirements of the uplink scheduling information for the transmission delay.
  • the scheduling information obtaining unit 102 and the baseband processing unit 104 may be directly connected or indirectly communicated, which is not specifically limited in the embodiment of the present invention.
  • the macro cell UE when a macro cell UE is close to a small power base station covered by a macro base station, the macro cell
  • the uplink signal of the UE to the small power base station is enhanced one by one, but even if the uplink signal of the macro cell UE to the small power base station exceeds the uplink signal of the own service link, the transmit power of the macro cell is transmitted compared to the low power base station. If the power is strong, the downlink service link of the macro base station is still stronger than the downlink of the small power base station, and the condition that the macro cell UE initiates handover measurement reporting is not satisfied, and the macro cell UE cannot be switched to the small power base station. Therefore, such a macro The uplink signal sent by the UE of the cell causes strong interference to the uplink of the small power base station.
  • the small power base station can receive and process the uplink signal of the macro UE, reconstruct and cancel the uplink signal, eliminate interference, and improve uplink receiving quality of the small power base station.
  • the uplink signal of the macro UE reconstructs and cancels the uplink signal, eliminate interference, and improve uplink receiving quality of the small power base station.
  • the uplink signal of the macro cell UE to the small power base station is better than the uplink signal quality of the macro base station service link. Therefore, the macro cell UE can also be utilized to the small power base station.
  • the uplink signal is subjected to uplink CoMP processing for the macro cell UE, and the uplink reception quality of the macro cell UE is improved.
  • the macro base station provides uplink scheduling information of the macro UE to the small power base station, and the small power base station receives the data signal of the macro cell UE, and the small power base station forwards the data signal of the received macro cell UE to the macro station, and Data of the macro cell UE received by the macro base station
  • the signals are combined. For specific processing steps, reference may be made to related content in the prior art, which is not described in detail in the embodiments of the present invention.
  • the receiving, by the small power base station, the user access information sent by the macro base station by using the inter-station transmission channel, the baseband processing unit 104 receiving the user access information, parsing the CRNTI of the macro cell UE, and forwarding the information to the The scheduling information acquisition unit 102 is described.
  • each of the foregoing units is only a logical division of functions of the small power base station, and the functions of the foregoing units may be arbitrarily combined, for example, may be integrated in one or more modules, or may be implemented by a base station.
  • Functional modules are distributed or centralized.
  • the information receiving unit 101 and the scheduling information acquiring unit 102 may be combined into one processing unit, and the processing unit may access the macro cell, acquire the cell level information of the macro cell, and further acquire the uplink scheduling information of the UE, where the unit may be connected to the base station.
  • the existing baseband processing unit, the middle radio frequency transceiver unit, and the like are in communication.
  • the functions of the information receiving unit 101 and the scheduling information acquiring unit 102 can be integrated in the baseband processing unit 104.
  • the embodiment of the present invention is not limited in any way, as long as the small power base station having the functions of the above units falls within the protection scope of the present invention.
  • the small power base station provided by the embodiment of the present invention is applied to a heterogeneous network in which the baseband is not centrally deployed, and the information receiving unit that can separately access the macro base station is set in the small power base station, and the information receiving and processing unit directly receives and processes the information.
  • the macro channel's broadcast channel and the physical downlink control channel are used to quickly obtain the uplink scheduling information of the user equipment of the access macro cell, so that the small power base station can perform the uplink interference signal cancellation and signal merging and other subsequent processing processes according to the uplink scheduling information.
  • the information processing speed of the small power base station enhances system performance.
  • An embodiment of the present invention provides a small power base station as shown in FIG.
  • the low power base station includes a receiver 201, a processor 202, and a transceiver 203, wherein the receiver 201
  • the macro base station is accessed through a wireless link, and the receiver 201 maintains a radio frequency isolation with the transceiver 203.
  • the receiver 201 has the capability of performing wireless communication with the macro station, and can be used as a macro base station user to access the macro station, and establish a radio link connection with the macro base station through the process of cell signal detection and signaling interaction, and perform data transmission.
  • a detailed access procedure reference may be made to the process of accessing a base station by a common UE in the prior art, and details are not described herein.
  • the receiver 201 can be configured as a special terminal in the small power base station with reference to a normal UE design.
  • the transceiver 203 is used for signal transmission and reception, and its function is the same as that of the transceiver of the base station in the prior art, and will not be described herein.
  • the low power base station further includes an antenna 204 coupled to the receiver 201, which can be used to receive the receiver
  • the antenna 101 can be separately configured for the receiver 101, and the receiver 101 uses the The antenna receives common channel information such as PBCH and PDCCH transmitted from the macro base station.
  • the deployment of the antenna 203 needs to be considered.
  • the deployment of the antenna 203 needs to be considered.
  • the low power base station may further include a communication interface 205 for performing information interaction with other base stations.
  • the communication interface 205 can be an X2 interface.
  • the X2 interface defines a point-to-point connection between the base station and the base station in a logical manner, and the specific implementation manner of the physical layer may be a copper cable, a microwave, an optical fiber, etc., and is not particularly limited herein, through the X2 interface, the small power base station and An inter-station data transmission channel can be established between the macro base stations.
  • the receiver 201 is configured to acquire cell level information of the macro cell carried on a physical broadcast channel (Physical Broadcast Channel, PBCH) of a macro cell managed by the macro base station. Specifically, the receiver 201 accesses the macro base station by using a radio link, and receives and demodulates the PBCH of the macro cell, and acquires cell level information of the macro cell carried on the PBCH, including the resource block distribution occupied by the PHICH, and the antenna port of the cell. System information such as quantity.
  • the macro cell broadcasts the same system information to all UEs in the cell through the PBCH, and the receiver 201, as a user of the macro base station, can directly and quickly acquire the above system information through the wireless link.
  • PBCH Physical Broadcast Channel
  • the receiver 201 may maintain the same as the downlink direction of the macro cell, acquire the physical cell identifier code PCI of the macro cell, distinguish signals from different cells, and receive the public of the macro cell. Information carried by the channel.
  • the processor 202 is configured to acquire, according to the cell radio network temporary identifier CRNTI and the cell level information that is matched with the user equipment UE in the macro cell, the UE that is carried on the physical downlink control channel PDCCH channel of the macro cell. Upstream scheduling information.
  • the CRNTI is a type of radio network temporary identifier, and is applicable to the UE on the common channel of the cell.
  • Each UE has a unique matching CRNTI in one cell, and can be used to distinguish different UEs.
  • the physical control format indication channel of the macro cell may be parsed according to the PHICH
  • the PCFICH obtains a control format pointer CFI in the PCFICH, and determines a number of symbols occupied by the PDCCH of the macro cell in one subframe.
  • the small power base station acquires uplink scheduling information of the UE that is carried on the physical downlink control channel PDCCH of the macro cell, where
  • the downlink control information DCI in the PDCCH is demodulated, and the resource allocation information of the uplink peer channel SCH of the macro cell UE included in the DCI format DCI is obtained, that is, the uplink scheduling information of the macro cell UE.
  • the transceiver 203 is configured to acquire, by the macro base station, a CRNTI of a UE in the macro cell, where the receiving, by the macro base station, is sent to an inter-station transmission channel.
  • User access information of the small power base station the user access information is used to indicate that the scheduling information acquiring unit processes a PDCCH of the UE, and the user access information includes a CRNTL that matches the UE.
  • the macro base station can identify a macro cell UE that may cause uplink interference to the small power base station.
  • the macro station will include the macro cell UE through an inter-station information transmission channel, such as an X2 interface.
  • the user access information of the CRNTI is sent to the corresponding small power base station, received by the transceiver 203, and forwarded to the processor 202, where the CRNTI matching the macro cell UE is parsed by the processor 202.
  • the processor 202 is further configured to: traverse a CRNTI interval of a CRNTI that may match the UE in each TTI period, to obtain the CRNTI.
  • traverse a CRNTI interval of a CRNTI that may match the UE in each TTI period, to obtain the CRNTI.
  • the traversal mode is used to obtain the CRNTI of the macro cell UE, and the macro base station does not need to send the user access information of the macro cell UE to the small power base station, and the restriction on the inter-station transmission channel is smaller, so that the erection of the small power base station is more flexible.
  • the processor 202 is further configured to process, according to the uplink scheduling information of the macro cell UE, an uplink transmit signal of the macro cell UE, including uplink interference signal cancellation, and/or perform uplink cooperation with the macro base station.
  • Point coordination transmission and other processing For a specific process, reference may be made to the related description of the embodiment shown in FIG. 2, and details are not described herein.
  • the receiver 201, the processor 202, and the transceiver 203 can be connected by a communication bus 206, which can be a local bus.
  • the processor 202 may be a multi-core processor, or may be a processor that is geographically dispersed and connected by a communication link, and may be centrally located.
  • the central processing unit (CPU) may be a digital signal processor (DSP) or other special processor, which is not limited in this embodiment of the present invention.
  • DSP digital signal processor
  • the processor 202 can be integrated into the baseband processing unit of the base station.
  • the small power base station provided by the embodiment of the present invention is applied to a heterogeneous network in which the baseband is not centrally deployed, and a receiver that can separately access the macro base station is set in the small power base station, and the receiver unit directly receives and processes the macro base station.
  • the broadcast channel and the physical downlink control channel are used to quickly obtain the uplink scheduling information of the user equipment that accesses the macro cell, so that the small power base station can perform the uplink interference signal cancellation and signal merging and other subsequent processing processes according to the uplink scheduling information, and improve the small processing flow.
  • the information processing speed of the power base station enhances system performance.
  • An embodiment of the present invention provides an information transmission method, which is applied to a heterogeneous network, where the heterogeneous network includes a small power base station and a macro base station that covers the small power base station, where the small power base station includes an information receiving unit, and The radio frequency transceiver unit, wherein the information receiving and processing unit accesses the macro base station through a wireless link, and the information receiving and processing unit and the medium radio frequency transceiver unit maintain radio frequency isolation, and the method flow is as shown in FIG. .
  • the information receiving and processing unit has the capability of performing wireless communication with the macro station, and can access the macro station as a user of the macro base station, establish a wireless link connection with the macro base station, and perform data transmission by a process such as cell signal detection and signaling interaction.
  • the information receiving processing unit may separately configure an antenna for accessing a corresponding macro base station, and the information receiving processing unit uses the antenna to receive common channel information such as PBCH and PDCCH transmitted from the macro base station.
  • the deployment of the antenna connected to the information receiving and processing unit needs to be considered.
  • the proper deployment of the antenna can prevent the medium-frequency transceiver unit and the information receiving and processing unit from interfering with each other, so that the transceiver or the medium-frequency transceiver unit of the small-power base station and the information receiving and processing unit are protected. Hold the RF isolation.
  • the method includes S301-S302:
  • the small-power base station acquires the cell-level information of the macro cell carried on the physical broadcast channel PBCH of the macro cell managed by the macro base station by using the information receiving and processing unit.
  • the cell-level information includes at least information such as a resource distribution of the physical cell of the macro cell, a resource distribution occupied by the PHICH, and an antenna port number of the macro cell.
  • the information receiving processing unit may continue to send a data transmission request to the macro base station by using a pre-configuration manner, for example, so that the information receiving processing unit can stay in the macro cell after accessing the corresponding macro cell, and avoid the cell. Switch.
  • the S300 may be further included before the S301, where the information receiving and processing unit accesses the macro base station by using a radio link, and may maintain the same as the downlink direction of the macro cell to obtain the physical cell identifier of the macro cell.
  • the code PCI distinguishes signals from different cells and receives information carried by a common channel of the macro cell.
  • the small-power base station acquires the bearer carried on the physical downlink control channel PDCCH of the macro cell according to the cell radio network temporary identifier CRNTI and the cell-level information that are matched with the user equipment UE in the macro cell. Uplink scheduling information of the UE.
  • the CRNTI is a type of radio network temporary identifier, and is applicable to the UE on the common channel of the cell.
  • Each UE has a unique matching CRNTI in one cell, and can be used to distinguish different UEs.
  • the physical control format indication channel PCFICH of the macro cell is parsed according to the PHICH, and the control format pointer CFI in the PCFICH is obtained, and the number of symbols occupied by the PDCCH of the macro cell in one subframe is determined.
  • the small power base station acquires uplink scheduling information of the UE that is carried on the physical downlink control channel PDCCH of the macro cell, where
  • the obtaining of the uplink scheduling information of the UE may be performed by the information receiving processing unit, or may be performed by other functional modules in the small power base station, for example, may be performed by a baseband processing unit, and the embodiment of the present invention does not do this. Specially limited.
  • the CRNTI may be obtained by the small power base station from the macro base station, and the small power base station receives user access information that is sent by the macro base station to the small power base station by using an inter-station transmission channel.
  • the user access information is used to indicate that the small power base station processes the PDCCH of the UE, and the user access information includes a CRNTI that matches the UE.
  • the small power base station may traverse the interval of the PDCCH of the macro cell where the CRNTI may occur in each TTI period, and acquire the CRNTI of the macro cell UE.
  • the traversal mode is used to obtain the CRNTI of the macro cell UE, and the macro base station does not need to send the user access information of the macro cell UE to the small power base station, so that the erection of the small power base station is more flexible, and the restriction on the transmission channel between the stations is smaller.
  • the traversal mode is used to obtain the CRNTI of the macro cell UE, and the macro base station does not need to send the user access information of the macro cell UE to the small power base station, and the restriction on the inter-station transmission channel is smaller, so that the erection of the small power base station is more flexible.
  • the CRNTI may be obtained by the baseband processing unit of the small power base station and forwarded to the information receiving processing unit; and the information receiving processing unit is configured according to the forwarded CRNTI and the parsed cell level.
  • the information is used to obtain uplink scheduling information of the UE.
  • the information receiving processing unit may directly receive the user access information sent by the macro base station or traverse the CRNTI interval to obtain the CRNTI of the specific macro cell UE, and further obtain the uplink scheduling information of the UE.
  • the method further includes: Step S303, the small power base station processing, according to uplink scheduling information of the UE, an uplink transmit signal of the UE, including uplink interference signal cancellation, and/or with the macro base station Perform uplink coordinated multipoint transmission.
  • the obtained uplink scheduling information may be sent by the information receiving processing unit to a baseband processing unit of the low power base station. Processing, by the baseband processing unit, the uplink transmission data of the macro cell UE according to the uplink scheduling information of the macro cell UE, including uplink interference signal cancellation, and/or performing uplink coordinated multipoint transmission with the macro base station.
  • the baseband processing unit Processing, by the baseband processing unit, the uplink transmission data of the macro cell UE according to the uplink scheduling information of the macro cell UE, including uplink interference signal cancellation, and/or performing uplink coordinated multipoint transmission with the macro base station.
  • the information receiving processing unit in the method embodiment shown in FIG. 4 represents only one logical functional unit, and may have the function of the information receiving unit 101 in the apparatus embodiment shown in FIG. 2, or may be provided with FIG.
  • the embodiment of the present invention does not limit this.
  • the information transmission method disclosed in the embodiment of the present invention is applied to a heterogeneous network in which a baseband is not centrally deployed, and an information receiving processing unit that can separately access a macro base station is set in a small power base station, and the information receiving and processing unit directly receives and processes the information.
  • the macro channel's broadcast channel and the physical downlink control channel are used to quickly obtain the uplink scheduling information of the user equipment of the access macro cell, so that the small power base station can perform the uplink interference signal cancellation and signal merging and other subsequent processing processes according to the uplink scheduling information.
  • the information processing speed of the small power base station enhances system performance.
  • the embodiment of the present invention provides a communication system. As shown in FIG.
  • the communication system includes a small power base station 401, and a macro base station 402 that covers the small power base station, where the small power base station 401 includes an information receiving and processing unit.
  • a radio frequency transceiver unit wherein the information receiving and processing unit accesses the macro base station through a wireless link, and the information receiving and processing unit and the medium radio frequency transceiver unit maintain a radio frequency isolation;
  • the small power base station 401 acquires cell level information of the macro cell carried on the physical broadcast channel PBCH of the macro cell managed by the macro base station by using the information receiving processing unit;
  • the small power base station 401 acquires the UE carried on the physical downlink control channel PDCCH of the macro cell according to the cell radio network temporary identifier CRNTI and the cell level information that are matched with the user equipment UE in the macro cell.
  • Uplink scheduling information ;
  • the macro base station 402 is configured to provide the cell level information to the information receiving processing unit.
  • an information receiving processing unit that can separately access the macro base station is set in the small power base station, and the information receiving processing unit directly receives and processes the broadcast channel and the physical downlink control channel of the macro base station. Therefore, the uplink scheduling information of the user equipment that accesses the macro cell is quickly obtained, so that the small power base station can perform subsequent processing procedures such as uplink interference signal cancellation and signal combining according to the uplink scheduling information, thereby improving the information processing speed of the small power base station and enhancing the information processing speed. System performance. It can be clearly understood by those skilled in the art that the embodiments of the present invention can be mutually referred to each other.
  • the small power base station of the embodiment shown in FIG. 2 or FIG. 3 can implement the information transmission method of the embodiment shown in FIG.
  • the execution body of the information transmission method in the embodiment shown in FIG. 2 may be the small power base station in the embodiment shown in FIG. 2 or FIG. 3, and the communication system shown in FIG. 4 may include the embodiment in the embodiment shown in FIG. 2 or FIG. Small power base station.
  • the specific flow of the method described above may be referred to the functional description of the corresponding unit or module in the foregoing device embodiment.
  • the disclosed apparatus and method can It is achieved in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the modules is only a logical function division.
  • there may be another division manner for example, multiple modules or components may be combined or Can be integrated into another device, or some features can be ignored, or not executed.
  • each functional module in each embodiment of the present invention may be integrated into one processing module, and each module may exist physically separately, or two or more modules may be integrated into one module.

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Abstract

Un mode de réalisation de la présente invention concerne un nœud à faible puissance (LPN), un système de communication, et un procédé de transmission d'informations utilisés dans un réseau hétérogène (HetNet) dont la bande de base est déployée dans un mode non centralisé. Le procédé consiste à : placer une unité de réception/traitement d'informations dans un LPN pouvant être connecté indépendamment à une station de base macro ; l'unité de réception/traitement d'informations reçoit et traite directement le canal de diffusion et un canal physique de commande de liaison descendante de la station de base macro pour acquérir rapidement les informations de programmation de liaison montante en vue de la connexion à l'équipement d'utilisateur (UE) d'une macrocellule. Le LPN exécute une opération supplémentaire d'élimination de signal d'interférence de liaison montante et de combinaison de signal d'après les informations de programmation de liaison montante, ce qui permet d'améliorer la vitesse de traitement d'informations du LPN et les performances du système.
PCT/CN2014/079088 2014-06-03 2014-06-03 Nœud à faible puissance, système de communication, et procédé de transmission d'informations WO2015184588A1 (fr)

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CN201480029976.XA CN105324969B (zh) 2014-06-03 2014-06-03 小功率基站、通信系统及信息传输方法
PCT/CN2014/079088 WO2015184588A1 (fr) 2014-06-03 2014-06-03 Nœud à faible puissance, système de communication, et procédé de transmission d'informations

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