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WO2010078855A1 - 协作多点传输系统中的下行传输方法、网络设备和无线系统 - Google Patents

协作多点传输系统中的下行传输方法、网络设备和无线系统 Download PDF

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Publication number
WO2010078855A1
WO2010078855A1 PCT/CN2010/070134 CN2010070134W WO2010078855A1 WO 2010078855 A1 WO2010078855 A1 WO 2010078855A1 CN 2010070134 W CN2010070134 W CN 2010070134W WO 2010078855 A1 WO2010078855 A1 WO 2010078855A1
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WIPO (PCT)
Prior art keywords
downlink
cell
coordinated
physical
channel
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PCT/CN2010/070134
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English (en)
French (fr)
Inventor
万蕾
赵亚军
程型清
任晓涛
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP10729114A priority Critical patent/EP2381709A4/en
Publication of WO2010078855A1 publication Critical patent/WO2010078855A1/zh
Priority to US13/180,221 priority patent/US20110268077A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems

Definitions

  • downlink coordinated multipoint transmission in Coordinated Multi-Point Transmission may be used, that is, multiple cells jointly
  • a terminal transmits a data channel to enhance the signal to interference-and-noise ratio of the received signal of the terminal or to increase the throughput of the system transmission.
  • the multiple cells that use the CoMP technology to transmit data channels to the same terminal are called coordinated cells, and the coordinated cells can be divided into a primary cell (Anchor Cell) and a serving cell (Serving Cell), and the terminal is a cooperative terminal (CoMP terminal).
  • the embodiments of the present invention provide a downlink transmission method, a network device, and a wireless system in a coordinated multipoint transmission system, which are used to improve effective coverage of a coordinated cell and prevent mutual interference when the coordinated cells independently transmit downlink physical channels.
  • the embodiment of the invention provides a downlink transmission method in a coordinated multipoint transmission system, including:
  • the physical downlink channel and/or the reference signal is mapped to the downlink physical resource and sent to the terminal according to the downlink mapping rule.
  • the embodiment of the invention provides a network device, including:
  • a determining module configured to determine a downlink physical resource and a downlink mapping rule corresponding to the physical downlink channel and/or the reference signal negotiated by the coordinated cell;
  • the sending module is configured to be connected to the acquiring module, and configured to map the physical downlink channel and/or the reference signal to the downlink physical resource and send the signal to the terminal according to the downlink mapping rule.
  • the embodiment of the invention provides a wireless system, including:
  • the network device is configured to determine a downlink physical resource and a downlink mapping rule corresponding to the downlink channel and/or the reference signal negotiated by the coordinated cell, and map the physical downlink channel to the downlink physical resource and send the packet to the terminal according to the downlink mapping rule.
  • FIG. 1 is a schematic structural diagram of a network according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of cooperation according to a second embodiment of the present invention.
  • FIG. 3 is a schematic flow chart of a method according to a third embodiment of the present invention.
  • FIG. 4 is a schematic flow chart of a method according to a fourth embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a method according to a fifth embodiment of the present invention.
  • FIG. 6 is a schematic flow chart of a method according to a sixth embodiment of the present invention.
  • FIG. 7 is a schematic flow chart of a method according to a seventh embodiment of the present invention.
  • FIG. 8 is a schematic flow chart of a method according to an eighth embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a network device according to a ninth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
  • a network device In a single point transmission system, one terminal corresponds to a cell serving it. In order to improve system performance, the wireless system can evolve from single-point transmission to multi-point transmission, that is, multiple cooperation points simultaneously serve one terminal.
  • 1 is a schematic structural diagram of a network according to a first embodiment of the present invention.
  • a network device includes a base station (eNodeB). 11 and an access point (AP) 12, the AP is a node including at least a radio frequency transceiver, and the AP can be configured with a single antenna element or multiple antenna elements.
  • a plurality of APs 12 are geographically distributed and connected to the base station 11. In a CoMP system, multiple APs may cooperate to transmit and receive data of the terminal 13.
  • the coordinated APs may be from the same base station, or may be from different base stations, or from different cells, without affecting the implementation of the embodiments of the present invention.
  • a cell may include one AP, and may also include multiple APs. The following describes an example in which one cell includes one AP. When one cell includes a plurality of APs, one of the APs can be regarded as one cell for reference implementation when implementing the following embodiments.
  • FIG. 2 is a diagram showing the cooperation of the second embodiment of the present invention.
  • the cell that is jointly served by the terminal is the coordinated cell 21, and the terminal of the coordinated cell joint service is the cooperative terminal 22.
  • Figure 2 shows an AP23 in a coordinated cell as an example. Referring to FIG. 2, three cooperative cells 21 jointly serve the cooperative terminal 22, and at this time, the three APs 23 jointly transmit downlink information to the cooperative terminal 22.
  • the terminal receives information from multiple coordinated cells.
  • signals of multiple cells use the same resource to transmit signals, so that the receiving end
  • a simpler reception combining algorithm can be employed, and the cooperating cell can employ techniques such as joint beamforming to improve its performance.
  • physical resources mainly include time domain resources (OFDM symbols) and frequency domain resources (subcarriers). Specifically, it mainly includes available resources such as carrier, subcarrier, physical resource block, subframe, time slot, OFDM symbol, sequence, sequence offset, sequence comb, frequency hopping pattern, period, scrambling code, etc.; , replaced by physical resources.
  • the cells participating in the transmission include an anchor cell and a serving cell.
  • the primary cell is a cell for transmitting system information, control information, and the like to the terminal.
  • the coordinated cell needs to coordinate physical resources, transmission modes, and the like used for each downlink channel.
  • the physical downlink channel and the reference signal include a Physical Downlink Control Channel (PDCCH), a Common Reference Signal (CRS), a Dedicated Reference Signal (DRS), and a Physical Control Format Indicator Channel (Physical Control). Format Indication Channel (PCFICH), Physical Multicast Channel (PMCH), Physical Broadcast Channel (PBCH), Synchronization Channel (SCH), Physical Downlink Shared Channel (PDSCH) One or more of them.
  • One of the main purposes of the CoMP technology is to jointly provide terminal services through multiple cells to improve the performance of the terminal.
  • the letters of each community The resources used by the channel are corresponding to the respective cells or are UE-specific (UE-Specific), or the cells are allocated independently. Since there is no cooperation with each other, the interference between the cells is large, which affects the performance of the communication.
  • FIG. 3 is a schematic flowchart of a method according to a third embodiment of the present invention, including:
  • Step 31 The network device (for example, the base station) in the coordinated cell determines the downlink physical resource and the downlink mapping rule corresponding to the physical downlink channel and/or the reference signal negotiated by the coordinated cell.
  • Step 32 The network device in the coordinated cell maps the physical downlink channel and/or the reference signal to the downlink physical resource according to the downlink mapping rule and sends the signal to the terminal.
  • the method may further include: the cooperative cell negotiating the downlink physical resource and the downlink mapping rule. Specifically, the coordinated cell may configure and allocate all corresponding resources or partial resources to the downlink physical resources.
  • the network device may further include: the network device notifying the terminal of the downlink mapping rule and/or the used downlink physical resource. So that the terminal receives the physical downlink channel and/or reference signal at the correct location.
  • the network device may further negotiate to determine a transmission mode corresponding to the physical downlink channel and/or the reference signal, so that the transmission modes of the coordinated cells are consistent, and the inter-cell interference is further reduced.
  • the physical downlink channel includes one or more of a PDCCH, a CRS, a DRS, a PCIFCH, a PMCH, a PBCH, a SCH, and a PDSCH.
  • the downlink physical resource includes one or more of the following resources: a carrier, a subcarrier, a physical resource block, a subframe, a time slot, a sequence, a sequence offset, a sequence comb, a frequency hopping pattern, a period, and a scrambling code.
  • the subframe includes a subframe corresponding to the non-ordinary service distinguishable by the LTE UE and a persistent scheduling subframe, where the subframe corresponding to the non-uniform service distinguishable by the LTE UE includes an MBSFN subframe, and the persistent scheduling subframe includes VoIP.
  • the carrier includes a designated carrier in carrier aggregation.
  • the downlink physical resource and the downlink mapping rule correspond to one or more of the following identifiers: a coordinated multipoint identifier, a terminal identifier, a primary cell identifier, and a serving cell identifier.
  • the identifier may be a coordinated multipoint identifier, a terminal identifier, a primary cell identifier, or a serving cell identifier
  • the coordinated cell obtains the according to the coordinated multipoint identifier, the terminal identifier, the primary cell identifier, or the serving cell identifier.
  • the downlink physical resource and the downlink mapping rule corresponding to the downlink channel negotiated by the coordinated cell.
  • a dominant identifier is determined in the multiple identifiers, and the coordinated cell determines a corresponding downlink physical resource and a downlink mapping rule according to the dominant identifier.
  • different identifiers may be used as the dominant identifier according to different application scenarios.
  • the rules corresponding to the primary identifier may be configured and executed, and the rules corresponding to the multiple identifiers may be executed at the same time, but the rules corresponding to multiple identifiers need to follow the rules corresponding to the primary identifier. For the above multiple identifiers, you can also match them as needed.
  • Different identifiers are used as the dominant identifier. Which identifier is selected as the dominant identifier may be determined by the primary cell, may also be determined by each coordinated cell, may also be determined by a preset cell, and may be further determined by the terminal.
  • the transmission mode includes a diversity mode and a multiplexing mode used by a physical downlink channel transmitted to the same terminal by one coordinated cell, or jointly sent by multiple coordinated cells, and jointly transmitted by multiple coordinated cells, for example, indicating a space frequency block code.
  • SFBC Spatial Frequency Block Coding
  • CDD Cyclic Delay Diversity
  • Mapping the physical downlink channel and/or reference signal to downlink physical resources includes: joint mapping and independent mapping.
  • Joint mapping refers to joint mapping of all coordinated cells, that is, the physical downlink channels corresponding to all coordinated users of all coordinated cells are jointly mapped to downlink physical resources.
  • Independent mapping refers to mapping each coordinated cell separately, which may be further divided into mappings of users (CoMP terminals and non-CoMP terminals) to which the cell belongs, or mapping according to CoMP terminals and non-CoMP terminals respectively.
  • the coordinated cells are mapped separately, the physical downlink channels corresponding to all the users of the single coordinated cell are jointly mapped to the downlink physical resources, or the coordinated users and non-cooperative users of the single coordinated cell are respectively mapped to different downlink physical resources.
  • the different downlink physical resources include different symbols and/or different resource blocks and/or different carriers, and the different symbols may be first LTE users (non-CoMP terminals) and rear LTE+ users (CoMP terminals).
  • the physical downlink channel and/or the reference signal is a physical downlink control channel
  • the primary cell or the cell configured by the system, or the cell selected by the UE, or the cell dynamically allocated by the base station according to the service state and the channel condition, or all the cooperation
  • the physical downlink channel can be sent by the cell, and the specific transmission mode includes a diversity mode, where the diversity mode includes SFBC and CDD.
  • the physical downlink channel and/or the reference signal is an RS
  • different coordinated cells respectively send RSs corresponding to different antenna ports belonging to the same cell.
  • the cell may map the downlink information to different antennas respectively, and then send them to the terminal by different antennas.
  • the downlink information may be distributed to different cooperation points and transmitted to the cooperation terminal. Taking RS as an example, one collaboration point can send a part of the RS for a collaborative terminal, and another collaboration point sends another part of the RS.
  • each collaboration point may be mapped to one virtual antenna port, and the RSs are respectively mapped to the virtual antenna ports (similar to mapping downlink information to different antenna ports in a single point), in each collaboration point.
  • the actual antennas then transmit the same mappings to the RSs at the collaboration point.
  • each coordinated cell will send itself. Notifying the terminal of the number of symbols occupied by the PDCCH.
  • the number of occupied symbols is the maximum value of the number of symbols occupied by the physical downlink control channel transmitted by each coordinated cell. For example, if the PDCCH sent by the first cell occupies 2 symbols and the second cell occupies 3 symbols, the first cell and the second cell both notify the terminal that three symbols are occupied.
  • the resources of the CoMP cell described in this embodiment may be implemented in the following manner.
  • CoMP11 and CoMP12 have no common cell with CoMP13.
  • the resources used by CoMP11 and CoMP12 may be the same or different.
  • CoMPl l and CoMP12 coordinate the use of resources when they are used. If the resources used by CoMPl and COMP12 are partially the same, CoMPl and CoMPU need to be coordinated.
  • CoMP13 has no relationship with CoMP12, CoMP13 and CoMPl1 resources, and can be independent of the association relationship.
  • a plurality of coordinated cells are used to cooperatively transmit, and a plurality of coordinated cells cooperatively allocate downlink physical resources and downlink mapping rules corresponding to the physical downlink channel, so that multiple physical cells are delivered by multiple coordinated cells to improve the coordinated cell.
  • the effective coverage of the coordinated cell, at the same time, each cooperative cell can avoid the mutual interference problem caused by the cooperative cells independently transmitting the downlink physical channel.
  • FIG. 4 is a schematic flowchart of a method according to a fourth embodiment of the present invention.
  • the PDCCH is used as an example in this embodiment, and the method includes: Step 41: A network device (for example, a base station) acquires a PDCCH corresponding to a coordinated cell negotiation. PDCCH physical resources and PDCCH mapping rules and transmission modes.
  • Step 42 The network device maps the PDCCH to a PDCCH physical resource according to the PDCCH mapping rule.
  • Step 43 Transmit downlink control information by using a physical downlink control channel.
  • UEs which are UE1, UE2, UE3, and UE4.
  • UE1 and UE2 are cooperative mode UEs, coordinated by CoMP11, UE1's primary cell is Celll, UE2's primary cell Cell2 , UE3 and UE4 are non-cooperative mode UEs, UE3 belongs to Celll, and UE4 belongs to Cell2.
  • the PDCCH joint mapping of UE1 and UE2 may be sent by a single cell in the coordinated cell (generally sent by the primary cell), and the physical resource locations corresponding to other coordinated cells do not send information;
  • PDCCH joint mapping of UE1 and UE2 which may be sent by a single cell in the coordinated cell (generally sent by the primary cell), and other physical resources corresponding to the coordinated cell may send other information;
  • the PDCCH joint mapping of UE1 and UE2 may be simultaneously transmitted by some cells in the coordinated cell, and the physical resource locations corresponding to other coordinated cells do not send information;
  • the PDCCH joint mapping of UE1 and UE2 may be simultaneously transmitted by some cells in the coordinated cell, and the physical resource locations corresponding to other coordinated cells may send other information;
  • the resources used by UE1 and UE2 in the above (1) (2) (3) (4) (5) methods and the resources used by UE3 and UE4 may be independent of each other.
  • the PDCCHs of UE3 and UE4 occupy the first two OFDM symbols of one subframe
  • the PDCCHs of UE1 and UE2 occupy the first 3rd and 4th OFDM symbols of one subframe.
  • the PDCCH of UE3 and UE4 occupies carrier 1
  • UE1, UE2 and other non-CoMP users (such as UE3) belonging to cell 1 jointly perform PDCCH mapping to the physical resources of cell 1, UE1, UE2 and other non-CoMP users belonging to cell 2 (such as UE4) Performing mapping to the physical resources of the cell 2, and then the cell 1 and the cell 2 are independently transmitted;
  • the PDCCHs of UE1, UE2 and other non-CoMP users (such as UE3) belonging to cell 1 are respectively mapped to the physical resources of cell 1, UE1, UE2 and other non-CoMP users belonging to cell 2 (such as UE4) PDCCH Physical resources mapped to cell 2 respectively
  • UE1, UE2 and other non-CoMP users (such as UE3) belonging to cell 1 are mapped to different physical resources of cell 1 (such as different OFDM symbols, different RBs, different carriers, etc.), UE1 PDCCH of UE2 and other non-CoMP users (such as UE4) belonging to cell 2 are mapped to different physical resources of cell 2, respectively.
  • the PDCCHs of UE1 and other non-CoMP users (such as UE3) belonging to cell 1 are respectively mapped to different physical resources of cell 1 (such as different OFDM symbols, different RBs, different carriers, etc.), UE2 and belong to The PDCCHs of other non-CoMP users (such as UE4) of cell 2 are mapped to cell 2, respectively. Different physical resources, then cell 1 and cell 2 are each independently transmitted.
  • control information belonging to the same UE may be sent by a single cell in the coordinated cell or simultaneously sent by multiple cells.
  • the coordinated cell that negotiates the control of the physical resource may be the primary cell, the serving cell configured by the system, or the serving cell selected by the terminal.
  • the coordinated cell may statically configure and control physical resources, and may also dynamically control physical resources according to service requirements and/or load dynamic configuration.
  • the control physical resources negotiated by the coordinated cell may be all the control physical resources corresponding to the coordinated cell, and may also be part of the control physical resource corresponding to the coordinated cell, and each of the coordinated cells may apply various transmit diversity modes in the transmission mode. For example: SFBC (Spatial Frequency Block Coding), CDD (Cyclic Delay Diversity), and so on.
  • SFBC Spatial Frequency Block Coding
  • CDD Cyclic Delay Diversity
  • the downlink resource includes one of a carrier, a subcarrier, a physical resource block, a subframe, a time slot, an OFDM symbol, a sequence, a sequence offset, a sequence comb, a frequency hopping pattern, a period, and a scrambling code according to a type.
  • the above resources (ie, sequence, sequence offset, etc.) used by each coordinated cell may be the same or different.
  • the subframe includes a subframe corresponding to the non-ordinary service distinguishable by the LTE UE and a persistent scheduling subframe, where the subframe corresponding to the non-uniform service distinguishable by the LTE UE includes an MBSFN subframe, and the persistent scheduling subframe includes VoIP.
  • the carrier includes a designated carrier in carrier aggregation.
  • the cell that is jointly served by the terminal may be a primary cell, or a cell configured by the system, or a cell selected by the UE or a cell dynamically allocated or all served according to a service state and a channel condition.
  • different coordinated cells cooperate to perform physical downlink control channel resource allocation and mapping and/or scrambling, and the resources used may be independently allocated and mapped and/or scrambled respectively; or resources of different coordinated cells adopt the same group of physics.
  • the downlink control channel resources are uniformly allocated and mapped and/or scrambled. Neither affects the implementation of this embodiment.
  • Celll and Cell2 If there are two cells, respectively, Celll and Cell2, wherein Celll and Cell2 form a cooperative cell CoMP11.
  • Physical resources include resource group 1, resource group 2, resource group 3, and resource group 4.
  • UE1 and UE2 are cooperative mode UEs, and are coordinated by the coordinated cell CoMP11.
  • the primary cell of UE1 is Cell1, the primary cell of UE2 is Cell2;
  • UE3 and UE4 are UEs of non-cooperative mode, UE3 belongs to Celll, and UE4 belongs to Cell2.
  • CoMPll selects one of the resource groups (for example, resource group 1), and the UE (UE1, UE2) in CoMP mode allocates and uses a certain resource in the resource group.
  • resource group 1 includes resources a and b.
  • Cell1 allocates a in resource group 1 to UE1. If Cell2 allocates resources to UE2, then a is not allocated, and only b can be allocated.
  • CoMPll selects several resource groups (such as resource group 1, resource group 2), and UEs (UE1, UE2) in CoMP mode allocate and use one of the two resource groups.
  • resource group 1 contains resources a ⁇ 3 ⁇ 4b
  • resource group 2 contains resources c and d
  • both Celll and Cell2 can allocate usage, b, c, d to UE1 and UE2.
  • Celll allocates a in resource group 1 to UE1, and when Cdl2 allocates resources to UE2, it will not allocate a, but can only divide ffib, c, d, but Cell2 can select from b, c, d and a.
  • Mutual influence on small resources are possible.
  • the method of independent allocation can be:
  • CoMPll does not specifically use a certain group or groups of resources.
  • Celll and Cdl2 allocate resources to UEs in CoMP mode, they coordinate with each other.
  • Resource group 1 contains resources & and 1)
  • resource group 2 contains resources c and d
  • Celll can only be assigned with a
  • b
  • Cell2 can only be assigned with c, d.
  • Celll allocates a in resource group 1 to UE1, and Celll can inform Cell2 of the use of a.
  • Cell2 allocates resources to UE2
  • Cell2 can select resources that interact with a from c and d. That is, Celll and Cell2 can coordinate with each other when allocating resources.
  • the resources allocated by UE3 and UE1, UE4 and UE2 may be the same or different.
  • the downlink physical resource and the downlink mapping rule corresponding to the PDCCH are coordinated by the plurality of coordinated cells by using a plurality of coordinated cells in a coordinated manner, so that the physical downlink channel is sent by the multiple coordinated cells to improve the coordinated cell.
  • the effective coverage is achieved.
  • each coordinated cell can avoid the mutual interference problem caused by the cooperative cells independently transmitting downlink physical channels.
  • FIG. 5 is a schematic flowchart of a method according to a fifth embodiment of the present invention.
  • the PDSCH is used as an example in this embodiment, and the method includes: Step 51: A network device (for example, a base station) acquires a PDSCH physical resource and a PDSCH mapping rule corresponding to a PDSCH negotiated by a coordinated cell, and Send mode.
  • a network device for example, a base station
  • Step 52 Map the PDSCH to the PDSCH physical resource according to the PDSCH mapping rule.
  • Step 53 The downlink data information is transmitted by using the PDSCH.
  • each coordinated cell can coordinate using the same VRB to PRB corresponding rule and/or coordination scrambling code.
  • the PRBs corresponding to the coordinated cells do not overlap each other.
  • Each of the PDSCH coordinated cells uses the same downlink mapping rule as the primary cell, and the data transmitted by the location of the reference signal transmitted in the serving cell can be erased or power boosting with the reference signal.
  • the downlink mapping rule includes one or any combination of the following: a mapping rule from a virtual resource block to a physical resource block, where the serving cell in the coordinated cell cancels data sent at a location where the reference signal is sent, The power of the reference signal is processed.
  • the downlink physical resource and the downlink mapping rule corresponding to the PDSCH are cooperatively allocated by the multiple coordinated cells by using a plurality of coordinated cells in a coordinated manner, so that the physical downlink channel is delivered by the multiple coordinated cells to improve the coordinated cell. The effective coverage is achieved.
  • each coordinated cell can avoid the mutual interference problem caused by the cooperative cells independently transmitting downlink physical channels.
  • FIG. 6 is a schematic flowchart of a method according to a sixth embodiment of the present invention.
  • an RS is taken as an example, and the method includes: Step 61: When a network device performs coordinated multi-point transmission, each coordinated cell coordinates a time-frequency resource and an RS mapping rule used by the RS. ;
  • Step 62 The network device maps the RS to a corresponding time-frequency location according to an RS mapping rule.
  • Step 63 The network device sends the RS to the terminal.
  • the resources used by the RS include frequency, OFDM symbol, codeword, and the like.
  • the resources used can be allocated and mapped independently; or
  • each cooperation cell can be regarded as a virtual antenna port, and the virtual antenna port is treated as an actual antenna port, and the RS is mapped according to the mapping rule of the actual antenna port.
  • the density and position of the RS can be changed.
  • a plurality of coordinated cells cooperatively allocate downlink physical resources and downlink mapping rules corresponding to the RS, so that reference signals are sent by multiple coordinated cells to improve effective coverage of the coordinated cells. Scope, at the same time, each cooperative cell can avoid mutual interference caused by the cooperative cells independently transmitting reference signals through negotiation.
  • FIG. 7 is a schematic flowchart of a method according to a seventh embodiment of the present invention.
  • a downlink physical resource and a downlink mapping rule corresponding to a cell identifier are used as an example, including:
  • Step 71 The network device acquires the cell identifier corresponding to the downlink physical resource and the downlink mapping rule.
  • Step 72 The network device acquires the downlink physical resource and the downlink mapping rule corresponding to the physical downlink channel negotiated by the coordinated cell according to the cell identifier.
  • Step 73 The network device maps the physical downlink channel to the downlink physical resource according to the downlink mapping rule.
  • Step 74 The network device uses the physical downlink channel to transmit the downlink information.
  • the downlink physical resource and the downlink mapping rule corresponding to the physical downlink channel the coordinated multipoint identifier (CoMP-ID), the terminal identifier (UE-ID), the primary cell identifier (Anchor Cell-ID), and the serving cell identifier ( Corresponding to one or more of Serving Cell-ID).
  • the CoMP-ID is different from the common cell identifier (for example: Anchor Cell-ID, Serving Cell-ID), and is CoMP-specific identification information.
  • the CoMP-ID indicates a virtual cell in the CoMP mode, and has some features of a common cell identifier, which can be used to identify a CoMP-specific cooperative cell.
  • the terminal serving the CoMP mode (ie, the terminal in the CoMP state) may be bound to a resource specific to the CoMP mode and/or a resource specific to the CoMP mode. Further, the coordinated cell needs to notify the CoMP-specific CoMP-ID, the UE-ID, and the Anchor Cell-ID to the terminal in the CoMP state, and further notify the coordinated cells that cooperate with each other, and the coordinated cell can also notify the Serving Cell-ID. .
  • different identifiers may be used as the dominant identifiers according to different application scenarios.
  • the rules corresponding to the primary identifier may be configured and executed, and the rules corresponding to the multiple identifiers may be executed at the same time, but the rules corresponding to multiple identifiers need to follow the rules corresponding to the primary identifier.
  • which identifier is selected as the dominant identifier may be determined by the primary cell, determined by each coordinated cell, or determined by a preset cell, or may be further determined by the terminal.
  • the PRB is taken as an example to describe the process of controlling the allocation of physical resources by two specific examples.
  • Cell 1 and cell 2 form a CoMP coordinated cell.
  • UE1-1 and UE2-1 are terminals in the CoMP state, and are coordinated by Cell1 and Cell2;
  • UE1-2 is a terminal in a non-CoMP state, and is a terminal in the normal state, and is only served by Celll.
  • Celll and Cell2 define a dedicated PRB corresponding to the same PRB as CoMP, and only the dedicated PRB can be used for the channel that transmits information to the terminals in the CoMP state, UE1-1 and UE2-1.
  • the coordinated cell further uses the CoMP-ID corresponding PRB obtained by the CoMP-ID and the corresponding downlink PRB mapping rule I", and uses the PRB to transmit CoMP downlink control information.
  • the UE1-1 can receive other information about the cell configuration of the Cdll, and the UE2-1 can also receive other information of the cell configuration of the Cell2, for example, downlink broadcast information.
  • Cell 1 allocates PRBs to UE 1-1 and UE 1-2; Ce ⁇ 12 assigns PRBs to UE2- 1. Coordinated when Cell 1 and Cell 2 are allocated, so that the PRBs of UE1-1 and UE2-1 can cooperate to perform CoMP; meanwhile, the PRB allocated by Celll to UE1-2 will not be the same as UE1-1 and UE2-1 in CoMP state. PRB conflict impact.
  • the physical downlink control channels of the allocated UE1-1 and UE2-1 correspond to different PRBs respectively to avoid interference between each other.
  • UE1-2 is also assigned to On the PRB different from UE2- 1, UE 1-1 and UE2- 1 can be allocated on the same PRB.
  • the downlink information in this embodiment is sent by the physical downlink channel negotiated by the multiple coordinated cells, and the cooperative cell that performs the cooperative allocation control of the downlink physical resource may be all the coordinated cells in the virtual cell that performs CoMP, or may perform CoMP. Certain cooperative cells within the virtual cell.
  • a plurality of coordinated cells are cooperatively transmitted, and a plurality of coordinated cells cooperatively allocate a cell identifier corresponding to a physical downlink channel, and obtain a corresponding downlink physical resource and a downlink mapping rule according to the cell identifier, so as to be implemented by multiple coordinated cells.
  • a physical downlink channel is sent to improve the effective coverage of the coordinated cell.
  • each coordinated cell can avoid the mutual interference problem caused by the cooperative cells independently transmitting the downlink physical channel.
  • FIG. 8 is a schematic flowchart of a method according to an eighth embodiment of the present invention.
  • a PBCH is taken as an example, including: Step 81: A network device (for example, a base station) acquires a PBCH physical resource and a PBCH mapping rule corresponding to a PBCH negotiated by a coordinated cell, and Send mode.
  • a network device for example, a base station
  • Step 82 The network device maps the PBCH to the PBCH physical resource according to the PBCH mapping rule.
  • the UE1 and the UE2 are the CoMP UE. This can have the following methods,
  • the PBCH of the UE1 and other non-CoMP users belonging to the cell 1 are respectively mapped to the physical resources of the cell 1, and the PBCH of the UE1 and other non-CoMP users belonging to the cell 2 are mapped to the physical resources of the cell 2, respectively.
  • UE1 and PBCHs of other non-CoMP users belonging to cell 1 respectively map to different physical resources of cell 1 (such as different OFDM symbols, different RBs, different carriers, etc.), UE1 and other cells belonging to cell 2 PBCHs of non-CoMP users are mapped to different physical resources of cell 2, respectively.
  • the PBCH joint mapping of the UE1 and the UE2 may be sent by a single cell in the coordinated cell or multiple cells are simultaneously transmitted, and the physical resource locations corresponding to the other coordinated cells do not transmit information.
  • control information belonging to the same UE may be sent by a single cell in the coordinated cell or multiple cells are simultaneously transmitted.
  • the coordinated cell that negotiates the control of the physical resource may be the primary cell, the serving cell configured by the system, or the serving cell selected by the terminal. Specifically, the coordinated cell may statically configure and control physical resources, and may also be based on services. Demand and/or load dynamic configuration controls physical resources.
  • the control physical resources negotiated by the coordinated cell may be all the control physical resources corresponding to the coordinated cell, and may also be part of the control physical resource corresponding to the coordinated cell, and each of the coordinated cells may apply various transmit diversity modes in the transmission mode. For example: SFBC (Spatial Frequency Block Coding), CDD (Cyclic Delay Diversity), and so on.
  • the downlink resource includes one of a carrier, a subcarrier, a physical resource block, a subframe, a time slot, an OFDM symbol, a sequence, a sequence offset, a sequence comb, a frequency hopping pattern, a period, and a scrambling code according to a type.
  • the above resources (ie, sequence, sequence offset, etc.) used by each coordinated cell may be the same or different.
  • the subframe includes a subframe corresponding to the non-ordinary service distinguishable by the LTE UE and a persistent scheduling subframe, where the subframe corresponding to the non-uniform service distinguishable by the LTE UE includes an MBSFN subframe, and the persistent scheduling subframe includes VoIP.
  • the carrier includes a designated carrier in carrier aggregation.
  • the cell that is jointly served by the terminal may be a primary cell, or a cell configured by the system, or a cell selected by the UE or a cell dynamically allocated or all served according to a service state and a channel condition.
  • different coordinated cells cooperate to perform physical broadcast channel resource allocation and mapping and/or scrambling, and the resources used may be independently allocated and mapped and/or scrambled respectively; or resources of different coordinated cells use the same set of physics. Broadcast channel resources, uniformly assigned and mapped and/or scrambled. Neither affects the implementation of this embodiment.
  • the downlink physical resource and the downlink mapping rule corresponding to the PBCH are cooperatively allocated by the multiple coordinated cells in a coordinated manner by using multiple coordinated cells, so that the physical downlink channel is sent by multiple coordinated cells to improve the coordinated cell.
  • the effective coverage is achieved.
  • each coordinated cell can avoid the mutual interference problem caused by the cooperative cells independently transmitting downlink physical channels.
  • FIG. 9 is a schematic structural diagram of a network device according to an eighth embodiment of the present invention, which includes an obtaining module 91 and a sending module 92.
  • the obtaining module 91 is configured to obtain a downlink physical resource and a downlink mapping rule and a sending mode corresponding to the physical downlink channel and/or the reference signal negotiated by the coordinated cell
  • the sending module 92 is connected to the obtaining module 91, and configured to use, according to the downlink mapping rule, The physical downlink channel and/or the reference signal are mapped to the downlink physical resource and sent to the terminal.
  • a plurality of coordinated cells cooperatively transmit a cell identifier corresponding to a physical downlink channel, and a corresponding downlink physical resource and a downlink mapping rule are obtained according to the cell identifier,
  • a plurality of coordinated cells deliver physical downlink channels to improve the effective coverage of the coordinated cells.
  • each coordinated cell can avoid mutual interference caused by the cooperative cells independently transmitting downlink physical channels.
  • the embodiment of the present invention further provides a wireless system, including a network device, configured to acquire a physical downlink channel negotiated by a coordinated cell and/or a corresponding downlink physical resource and a downlink mapping rule; according to the downlink mapping rule The physical downlink channel and/or the mapping to the downlink physical resource are sent to the terminal.
  • the network device can be the network device described in the fourth embodiment.
  • a plurality of coordinated cells are cooperatively transmitted, and a plurality of coordinated cells cooperatively allocate a cell identifier corresponding to a physical downlink channel, and obtain a corresponding downlink physical resource and a downlink mapping rule according to the cell identifier, so as to be implemented by multiple coordinated cells.
  • a physical downlink channel is sent to improve the effective coverage of the coordinated cell.
  • each coordinated cell can avoid the mutual interference problem caused by the cooperative cells independently transmitting the downlink physical channel.

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Description

协作多点传输系统中的下行传输方法、 网络设备和无线系统 本申请要求于 2009年 1月 12 日提交中国专利局、 申请号为 CN200910001790.4、 发明名称为 "协作多点传输系统中的下行传输方法、 网络设备和无线系统"的中国专利 申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域 本发明涉及无线通信技术， 特别涉及一种协作多点传输系统中的下行传输方法、 网 络设备和无线系统。 背景技术 在无线通信系统中， 为了提高小区边缘用户下行传输的性能， 可使用协作多点传输 (Coordinated Multi-Point transmission, 简称 CoMP)技术中的下行协作多点传输， 即多 个小区联合向同一个终端传输数据信道， 以便增强终端接收信号的信干噪比 （signal to interference-and-noise ratio )或者提升系统传输的吞吐量。其中， 使用 CoMP技术向同一 个终端传输数据信道的多个小区称为协作小区，协作小区可以分为主小区（Anchor Cell) 和服务小区 （Serving Cell) , 该终端为协作终端 （CoMP终端）。
发明人在实现本发明的过程中发现现有技术至少存在如下问题： 对于控制信道， 如 果只由一个小区来发送， 则其覆盖范围与数据信道不太匹配， 影响协作小区的有效覆盖 范围， 另外， 假如各个小区单独发送控制信息， 这样发送给同一用户的信道将会相互干 扰， 造成接收性能的下降， 不能最佳的达到预期的效果。 发明内容
本发明实施例提供一种协作多点传输系统中的下行传输方法、 网络设备和无线系 统， 用以提高协作小区的有效覆盖范围， 以及防止协作小区各自独立发送下行物理信道 时的相互干扰。
本发明实施例提供了一种协作多点传输系统中的下行传输方法， 包括：
确定协作小区协商的物理下行信道和 /或参考信号所对应的下行物理资源和下行映 射规则；
根据该下行映射规则将该物理下行信道和 /或参考信号映射到该下行物理资源上发 送给终端。 本发明实施例提供了一种网络设备， 包括：
确定模块，用于确定协作小区协商的物理下行信道和 /或参考信号所对应的下行物理 资源和下行映射规则；
发送模块， 与所述获取模块连接， 用于根据该下行映射规则将该物理下行信道和 / 或参考信号映射到下行物理资源上发送给终端。
本发明实施例提供了一种无线系统， 包括：
网络设备，用于确定协作小区协商的理下行信道和 /或参考信号所对应的下行物理资 源和下行映射规则； 根据该下行映射规则将该物理下行信道映射到该下行物理资源上发 送给终端。
由上述技术方案可知，本发明实施例通过多个协作小区协作分配物理下行信道对应 的下行物理资源及下行映射规则， 使得可以采用多个协作小区协作传输的方式， 实现由 多个协作小区下发物理下行信道， 以提高协作小区的有效覆盖范围， 同时， 各协作小区 通过协商可以避免协作小区各自独立发送下行物理信道时造成的相互干扰问题。 附图说明 图 1为本发明第一实施例的网络结构示意图；
图 2为本发明第二实施例的协作示意图；
图 3为本发明第三实施例的方法流程示意图；
图 4为本发明第四实施例的方法流程示意图；
图 5为本发明第五实施例的方法流程示意图；
图 6为本发明第六实施例的方法流程示意图；
图 7为本发明第七实施例的方法流程示意图；
图 8为本发明第八实施例的方法流程示意图
图 9为本发明第九实施例的网络设备的结构示意图。 具体实施方式 下面通过附图和实施例， 对本发明的技术方案做进一步的详细描述。
在单点传输系统中， 一个终端对应一个为其服务的小区。 为了提高系统性能， 无线 系统可以从单点传输向多点传输演进， 即由多个协作点同时为一个终端服务。 图 1为本 发明第一实施例的网络结构示意图， 在 CoMP系统中， 网络设备包括基站 （eNodeB) 11和接入点 （Access Point, AP) 12， AP是一个至少包括射频收发信机的节点， AP上可 以配置单个天线元或多个天线元。 多个 AP12在地理位置上分散分布并连接到基站 11。 在 CoMP系统中， 多个 AP可以协作发射和接收终端 13的数据， 这些协作的 AP可以来 自同一个基站， 也可以来自不同的基站， 或来自不同的小区， 都不影响本发明实施例的 实现。 其中， 一个小区可以包括一个 AP, 也可以包括多个 AP, 下述以一个小区包括一 个 AP为例进行说明。 在一个小区包括多个 AP时， 实施下述实施例时可将一个 AP视 为一个小区进行参照实施。
为了提高小区边缘用户下行传输的性能，可以由多个小区联合向服务的终端发送信 号， 以便增强终端接收信号的信干噪比， 或者提升传输的吞吐量。 图 2为本发明第二实 施例的协作示意图。联合为终端服务的小区为协作小区 21，该被协作小区联合服务的终 端为协作终端 22。 图 2中以一个协作小区中包括一个 AP23为例。 参见图 2， 三个协作 小区 21联合为协作终端 22服务， 此时， 三个 AP23共同发送下行信息给协作终端 22。
在下行协作传输时， 终端接收来自多个协作小区的信息， 为了使终端能够更加准确 的恢复出多个小区发送来的信息， 一般要求多个小区的信号采用相同的资源发送信号， 这样接收端能够采用较简单的接收合并算法，并且协作小区能够采用诸如联合波束成形 的技术来提高其性能。 在现有的 LTE系统中， 物理资源主要包括时域资源 （OFDM符 号） 和频域资源 （子载波）。 具体而言， 主要包含载波、 子载波、 物理资源块、 子帧、 时隙、 OFDM符号、序列、序列偏移、 序列梳齿、跳频图案、 周期、扰码等可用的资源； 下面为了方便， 以物理资源来替代。 在进行下行协作传输时， 参与进行传输的小区包括 主小区 （anchor cell) 和服务小区 （serving cell)。 主小区是用来向终端发送系统信息， 控制信息等的小区， 为了能够有效的进行通信， 协作小区需要彼此协调各下行信道所用 的物理资源以及发送模式等。 其中物理下行信道和参考信号包括物理下行控制信道 (Physical Downlink Control Channel, PDCCH)、公共参考信号（Common Reference Signal CRS )、 专用参考信号 （Dedicated Reference Signal, DRS )、 物理控制格式指示信道 ( Physical Control Format Indication Channel , PCFICH )、物理多播信道（ Physical Multicast Channel, PMCH )、 物理广播信道 （Physical Broadcast Channel, PBCH )、 同步信道 ( Synchronization Channel, SCH )、 物理下行共享信道 ( Physical Downlink Shared Channel, PDSCH) 中的一种或多种。
在 CoMP技术中存在各小区之间的干扰可能原因如下： CoMP技术其主要目的之一 是通过多个小区联合为终端服务， 以提高终端的性能。 在一般情况下， 各个小区的各信 道所用的资源是和各自小区进行对应的或者说是 UE特有的（UE-Specific)，或者说各小 区独立进行分配， 由于没有彼此协作， 造成小区间的干扰较大， 影响通信的性能。
图 3为本发明第三实施例的方法流程示意图， 包括：
步骤 31 : 协作小区中的网络设备 （例如基站）确定协作小区协商的物理下行信道和 /或参考信号所对应的下行物理资源和下行映射规则。
步骤 32:协作小区中的网络设备根据所述下行映射规则将所述物理下行信道和 /或参 考信号映射到下行物理资源上发送给终端。
在步骤 31之前还可以包括： 所述协作小区协商所述下行物理资源和所述下行映射 规则。 具体为： 协作小区可以将其对应的全部资源或者部分资源配置和分配成所述下行 物理资源。
在步骤 32之后还可以包括： 网络设备将下行映射规则和 /或所用的下行物理资源通 知给终端。 以便终端在正确的位置接收到物理下行信道和 /或参考信号。
或者，网络设备还可以进一步协商确定物理下行信道和 /或参考信号所对应的发送模 式， 以便各协作小区的发送模式一致， 进一步降低小区间干扰。
其中， 所述物理下行信道包括： PDCCH、 CRS、 DRS、 PCIFCH、 PMCH、 PBCH、 SCH、 PDSCH中的一种或多种。
所述下行物理资源包括以下资源中的一个或多个： 载波、 子载波、 物理资源块、 子 帧、 时隙、 序列、 序列偏移、 序列梳齿、 跳频图案、 周期、 扰码。 所述子帧包括 LTE UE 可区分的非普通业务对应的子帧和持续调度子帧， 所述 LTE UE可区分的非普通业务对 应的子帧包括 MBSFN子帧， 所述持续调度子帧包括 VoIP子帧。 所述载波包括载波聚合 中的指定载波。
所述下行物理资源和所述下行映射规则与下述标识中的一个或多个对应：协作多点 标识、 终端标识、 主小区标识、 服务小区标识。 当所述标识为一个时， 该标识可以为协 作多点标识、 终端标识、 主小区标识或服务小区标识， 协作小区根据该协作多点标识、 终端标识、主小区标识或服务小区标识获取所述协作小区协商的下行信道对应的下行物 理资源和下行映射规则。 当所述标识为多个时， 先在多个标识中确定一个主导标识， 协 作小区根据所述主导标识确定相应的下行物理资源和下行映射规则。具体可以根据不同 的应用场景采用不同的标识作为主导标识。 选定对应的标识作为主导标识之后， 可以按 照主导标识对应的规则配置和执行， 还可以同时执行多个标识对应的规则， 但多个标识 同时对应的规则需要遵循主导标识对应的规则。 对于上述多个标识， 还可以根据需要配 置釆用不同的标识作为主导标识。具体选用哪个标识作为主导标识，可以由主小区确定， 也可以由各个协作小区协商确定， 还可以由预先设定的小区确定， 还可以进一步由终端 确定。
所述发送模式包括发送给同一终端的物理下行信道由一个协作小区发送， 或者由多 个协作小区联合发送以及由多个协作小区联合发送所用的分集方式及复用方式， 例如指 示空频分组码 （ Spatial Frequency Block Coding, SFBC)、 或循环延迟分集 （Cyclic Delay Diversity, CDD)。
将所述物理下行信道和 /或参考信号映射到下行物理资源包括： 联合映射和独立映 射。 联合映射是指对所有协作小区进行联合映射， 即将所有协作小区的所有协作用户对 应的物理下行信道联合映射到下行物理资源。 独立映射是指分别对各协作小区进行映 射，其中又可以分为将该小区所属的用户（CoMP终端和非 CoMP终端）联合进行映射， 或者按照 CoMP终端和非 CoMP终端分别进行映射，即在每个协作小区分别进行映射时， 可以分别将单个协作小区的所有用户对应的物理下行信道联合映射到下行物理资源； 或 者分别将单个协作小区的协作用户和非协作用户分别映射到不同的下行物理资源，该不 同的下行物理资源包括不同的符号和 /或不同的资源块和 /或不同的载波， 该不同的符号 可以先排 LTE用户 （非 CoMP终端）， 后排 LTE+用户 （CoMP终端）。
当所述物理下行信道和 /或参考信号为物理下行控制信道时，主小区，或由系统配置 的小区， 或 UE选择的小区， 或根据业务状态和信道状况基站动态分配的小区， 或所有 协作小区， 均可以发送该物理下行信道， 具体的发送方式包括分集方式， 所述分集方式 包括 SFBC和 CDD。
当所述物理下行信道和 /或参考信号为 RS时， 不同协作小区分别发送属于同一个小 区的不同天线口对应的 RS。在单点传输时， 为终端服务的小区可能存在多个天线， 该小 区可以将下行信息分别映射到不同的天线上， 之后由不同的天线发送给终端。在协作多 点传输时， 由于是多个协作点同时为协作终端服务， 在发送下行信息时， 可以将下行信 息分布在不同的协作点上发送给协作终端。 以 RS为例， 一个协作点可以发送针对一协作 终端的 RS的一部分， 另外的协作点分别发送该 RS的另外的部分。 在实现上， 可以将每 个协作点对应一个虚拟天线端口，将 RS分别映射到各虚拟天线端口上（类似与单点中的 将下行信息映射到不同的天线端口上）， 每个协作点中的实际天线再分别传输相同的映 射到该协作点上的 RS。
为了使终端准确获知物理下行控制信道， 如 PDCCH, 各协作小区将自身发送的 PDCCH占用的符号数通知给终端，
所述占用的符号数为各协作小区发送的物理下行控制信道占用的符号数中的最大 值。 例如， 第一小区发送的 PDCCH占用 2个符号， 第二小区占用 3个符号， 则第一小 区和第二小区都向终端通知占用了 3个符号。
本实施例中所述的 CoMP小区的资源可以采用如下方式实现，
假如有三个 CoMP小区， 分别为 celll , cell2, cell3,cell 4,cell5; celll和 cell2组成一 个 CoMP小区 CoMPl l， cell2和 cell3组成另一个 CoMP小区 CoMP12， 这里 cell2同属 于 CoMPll和 CoMP12; cell 4和 cell5组成一个 CoMP小区 CoMP13， CoMPll和 CoMP12 与 CoMP13没有共同的小区。 CoMPll和 CoMP12所用的资源可以相同也可以不同， 在 使用的资源的时候 CoMPl l 和 CoMP12协调使用其能利用的资源； 如果 CoMPl l 和 COMP12所用的资源有一部分相同，则 CoMPl l和 CoMPU需要协调使用相同部分的资 源； 如果 CoMPll和 CoMP12所用的资源可以完全不同， 可以简单的实现彼此独立分配 所述物理资源。 CoMP13与 CoMP12、 CoMP13与 CoMPl l的资源没有关联关系， 可以 不受关联关系的约束。
本实施例通过采用多个协作小区协作传输的方式， 由多个协作小区协作分配物理下 行信道对应的下行物理资源及下行映射规则， 实现由多个协作小区下发物理下行信道， 以提高协作小区的有效覆盖范围， 同时， 各协作小区通过协商可以避免协作小区各自独 立发送下行物理信道时造成的相互干扰问题。
下面针对各物理下行信道进行说明 - 图 4为本发明第四实施例的方法流程示意图， 本实施例以 PDCCH为例， 包括： 步骤 41 : 网络设备 （例如基站） 获取协作小区协商的 PDCCH所对应的 PDCCH物 理资源和 PDCCH映射规则及发送模式。
步骤 42、 网络设备根据所述 PDCCH映射规则将所述 PDCCH映射到 PDCCH物理资 源。
步骤 43: 利用物理下行控制信道传输下行控制信息。
本实施例中， 假如有 2个小区， 分别为 Celll、 Cell2， 其中， Celll和 Cell2组成一个协 作小区 CoMPll。 有 4个 UE， 分别为 UE1、 UE2、 UE3、 UE4。 其中， UE1和 UE2为协作 模式的 UE， 被协作小区 CoMPll协作服务， UE1的主小区为 Celll , UE2的主小区 Cell2; UE3和 UE4为非协作模式的 UE， UE3隶属于 Celll , UE4属于 Cell2。
可以采取如下的方案， ( 1 ) UE1和 UE2的 PDCCH联合映射， 可以由协作小区中的单个小区发送 (一般由主小区发送）， 其它协作小区对应的物理资源位置不发送信息；
(2) UE1和 UE2的 PDCCH联合映射， 可以由协作小区中的单个小区发送 (一般由主小区发送）， 其它协作小区对应的物理资源位置可发送其它信息；
(3 ) UE1和 UE2的 PDCCH联合映射， 可以由协作小区中的所有小区同时 发送；
(4) UE1和 UE2的 PDCCH联合映射， 可以由协作小区中的部分小区同时 发送， 其它协作小区对应的物理资源位置不发送信息；
(5 ) UE1和 UE2的 PDCCH联合映射， 可以由协作小区中的部分小区同时 发送， 其它协作小区对应的物理资源位置可发送其它信息；
(6) 上述 (1) (2) (3) (4) (5)方法中的 UE1和 UE2所用的资源与 UE3和 UE4 所用的资源可以是彼此独立的。 例如 UE3 和 UE4 的 PDCCH 占用一个子帧的前两个 OFDM符号， UE1和 UE2的 PDCCH占用一个子帧的前第 3和 4个 OFDM符号。 或例 如 UE3和 UE4的 PDCCH占用载波 1， UE1和 UE2的 PDCCH占用载波 2。
(7) UE1,UE2和属于小区 1的其它非 CoMP用户 （如 UE3 ) 的 PDCCH联 合进行映射到小区 1的物理资源， UE1, UE2和属于小区 2的其它非 CoMP用户 (；如 UE4) 的 PDCCH联合进行映射到小区 2的物理资源，然后小区 1和小区 2各自独立进行发送；
(8 ) UE1,UE2和属于小区 1的其它非 CoMP用户 （如 UE3 ) 的 PDCCH分 别进行映射到小区 1的物理资源， UE1,UE2和属于小区 2的其它非 CoMP用户 (；如 UE4) 的 PDCCH分别进行映射到小区 2的物理资源
(9) UE1,UE2和属于小区 1的其它非 CoMP用户 （如 UE3 ) 的 PDCCH分 别进行映射到小区 1的不同的物理资源（如不同的 OFDM符号， 不同的 RB,不同的载波 等）， UE1,UE2和属于小区 2的其它非 CoMP用户 （如 UE4) 的 PDCCH分别进行映射 到小区 2的不同的物理资源
( 10) UE1和属于小区 1的其它非 CoMP用户 （如 UE3 ) 的 PDCCH联合进 行映射到小区 1的物理资源， UE2和属于小区 2的其它非 CoMP用户 (如 UE4)的 PDCCH 联合进行映射到小区 2的物理资源， 然后小区 1和小区 2各自独立进行发送；
( 11 ) UE1和属于小区 1的其它非 CoMP用户 （如 UE3 ) 的 PDCCH分别进 行映射到小区 1的不同的物理资源（如不同的 OFDM符号， 不同的 RB,不同的载波等）， UE2和属于小区 2的其它非 CoMP用户 （如 UE4)的 PDCCH分别进行映射到小区 2的 不同的物理资源， 然后小区 1和小区 2各自独立进行发送。
上述几种方法， 属于同一 UE的控制信息可以由协作小区中的单个小区发送或多个 小区同时发送。
本实施例中， 协商控制物理资源的协作小区可以是主小区、 系统配置的服务小区或 终端选择的服务小区。 具体地， 协作小区可以静态配置控制物理资源， 还可以根据业务 需求和 /或负载动态配置控制物理资源。本实施例中协作小区所协商出的控制物理资源可 以为协作小区对应的全部控制物理资源， 还可以为协作小区对应的部分控制物理资源， 各个协作小区其发送模式可以应用各种发送分集模式， 例如： SFBC (Spatial Frequency Block Coding, 空频分组码）、 CDD ( Cyclic Delay Diversity, 循环延迟分集） 等。
本实施例中，下行资源按照类型包括载波、子载波、物理资源块、子帧、时隙、 OFDM 符号、 序列、 序列偏移、 序列梳齿、 跳频图案、 周期、 扰码中的一种或多种， 各协作小 区采用的上述各资源 （即序列、 序列偏移等） 可以相同或不同。 所述子帧包括 LTE UE 可区分的非普通业务对应的子帧和持续调度子帧， 所述 LTE UE可区分的非普通业务对 应的子帧包括 MBSFN子帧， 所述持续调度子帧包括 VoIP子帧。 所述载波包括载波聚 合中的指定载波。
本实施例中， 联合为终端服务的小区可以是主小区， 或由系统配置的小区， 或 UE 选择的小区或者根据业务状态和信道状况等基站动态分配的或所有服务的小区
本实施例中， 不同协作小区协作进行物理下行控制信道资源分配和映射和 /或加扰， 其所用的资源可以各自独立分配和映射和 /或加扰;或者不同协作小区的资源采用同一组 物理下行控制信道资源， 统一进行分配和映射和 /或加扰。 均不影响本实施例的实施。
例如， 还可使用如下方式进行资源协商与分配：
假如有 2个小区，分别为 Celll、Cell2，其中， Celll和 Cell2组成一个协作小区 CoMPll。 物理资源有资源组 1、资源组 2、资源组 3、 资源组 4。有 4个 UE， 分别为 UE1、 UE2、 UE3、 UE4。 其中， UE1和 UE2为协作模式的 UE， 被协作小区 CoMPll协作服务， UE1的主小区 为 Celll , UE2的主小区 Cell2; UE3和 UE4为非协作模式的 UE， UE3隶属于 Celll , UE4属 于 Cell2。
统一进行分配的方式可以为：
( 1 ) CoMPll选用其中一个资源组（例如资源组 1 )， 处于 CoMP模式的 UE (UE1、 UE2)分配使用该资源组中的某个资源。 例如： 资源组 1包含资源 a和 b， Celll给 UE1分配 使用了资源组 1中的 a， 则 Cell2给 UE2分配资源时， 则不会再分配 a， 只能分配 b。 (2) CoMPll选用其中几个资源组（例如资源组 1， 资源组 2)， 处于 CoMP模式的 UE (UE1、 UE2) 分配使用这两个资源组中的某个资源。 例如： 资源组 1包含资源 a^¾b， 资源组 2包含资源 c和 d， Celll和 Cell2均可以给 UEl和 UE2分配使用 、 b、 c、 d。 Celll给 UEl分配使用了资源组 1中的 a， 则 Cdl2给 UE2分配资源时， 则不会再分配 a， 只能分 ffib、 c、 d， 但 Cell2可以从 b、 c、 d中选择与 a相互影响小的资源。
独立分配的方式可以为：
CoMPll不专门选用某一组或几组资源。 但 Celll与 Cdl2给处于 CoMP模式的 UE分配 资源时， 彼此相互协调。 例如： 资源组 1包含资源 &和1)， 资源组 2包含资源 c和 d， Celll 只能分配使用 a、 b， Cell2只能分配使用 c、 d。 Celll给 UEl分配使用了资源组 1中的 a， 同 时 Celll可以把 a被使用的情况告知 Cell2， 则 Cell2给 UE2分配资源时， Cell2可以从 c、 d中 选择与 a相互影响小的资源。即 Celll与 Cell2分配资源时可以彼此协调。 UE3与 UE1， UE4 与 UE2分配的资源可以一致， 也可以不同。
本实施例通过釆用多个协作小区协作传输的方式， 由多个协作小区协作分配 PDCCH对应的下行物理资源及下行映射规则， 实现由多个协作小区下发物理下行信道， 以提高协作小区的有效覆盖范围， 同时， 各协作小区通过协商可以避免协作小区各自独 立发送下行物理信道时造成的相互干扰问题。
图 5为本发明第五实施例的方法流程示意图， 本实施例以 PDSCH为例， 包括： 步骤 51 : 网络设备 （例如基站） 获取协作小区协商的 PDSCH所对应的 PDSCH物 理资源和 PDSCH映射规则及发送模式。
步骤 52、 根据 PDSCH映射规则将 PDSCH映射到 PDSCH物理资源；
步骤 53: 利用 PDSCH传输下行数据信息。
PDSCH 的信息由多个协作小区联合进行发送时， 各协作小区可协调使用相同的 VRB到 PRB的对应规则和 /或协调扰码。
PDSCH各协作小区若不使用相同的 VRB到 PRB的对应规则和 /或协调扰码， 则协作 小区对应的 PRB不相互重叠。
PDSCH各协作小区使用与主小区相同的下行映射规则，服务小区中发送参考信号的 位置发送的数据可以打掉或者与参考信号进行功率抬升的处理 （power boosting) 。
本实施例中， 下行映射规则包括以下之一或其任意组合： 从虚拟资源块到物理资源 块的映射规则， 所述协作小区中的服务小区将在发送参考信号的位置发送的数据打掉， 对参考信号进行功率抬升的处理。 本实施例通过釆用多个协作小区协作传输的方式，由多个协作小区协作分配 PDSCH 对应的下行物理资源及下行映射规则， 实现由多个协作小区下发物理下行信道， 以提高 协作小区的有效覆盖范围， 同时， 各协作小区通过协商可以避免协作小区各自独立发送 下行物理信道时造成的相互干扰问题。
图 6为本发明第六实施例的方法流程示意图， 本实施例以 RS为例， 包括： 步骤 61 : 网络设备进行多点协作传输时， 各协作小区协调 RS 所用的时频资源及 RS映射规则；
步骤 62、 网络设备根据 RS映射规则将 RS映射到相应的时频位置。
步骤 63: 网络设备将 RS发送给终端。
不同协作小区协作进行 RS资源分配和映射， RS所用的资源包括频率， OFDM符 号， 码字等。 其所用的资源可以各自独立分配和映射； 或者
不同协作小区分别使用属于同小区的不同天线口对应的 RS。 即可以将各个协作小 区看成一个虚拟天线端口， 将虚拟天线端口按实际的天线端口对待， RS 按照实际天线 端口的映射规则进行映射。 另外根据实际情况， 可以改变 RS的密度和位置。
本实施例通过采用多个协作小区协作传输的方式， 由多个协作小区协作分配 RS对 应的下行物理资源及下行映射规则， 实现由多个协作小区下发参考信号， 以提高协作小 区的有效覆盖范围， 同时， 各协作小区通过协商可以避免协作小区各自独立发送参考信 号时造成的相互干扰问题
图 7为本发明第七实施例的方法流程示意图，本实施例以通过小区标识对应下行物 理资源和下行映射规则为例， 包括：
步骤 71 : 网络设备获取与下行物理资源和下行映射规则对应的小区标识； 步骤 72: 网络设备根据所述小区标识获取协作小区协商的物理下行信道对应的下行 物理资源和下行映射规则；
歩骤 73: 网络设备根据下行映射规则将物理下行信道映射到下行物理资源； 步骤 74: 网络设备利用物理下行信道传输下行信息。
本实施例中， 物理下行信道对应的下行物理资源和下行映射规则与协作多点标识 (CoMP-ID)、终端标识（UE-ID)、主小区标识（Anchor Cell-ID )、服务小区标识（Serving Cell-ID) 中的任意一个或多个相对应。 其中的 CoMP-ID不同于普通的小区标识 （例如： Anchor Cell-ID, Serving Cell-ID), 是 CoMP专有的标识信息。 CoMP-ID表示 CoMP模式 的虛拟小区， 具有普通的小区标识的部分特征， 可以用于标识 CoMP特有的协作小区特 征， 服务于 CoMP模式的终端 （即处于 CoMP状态的终端）， 可以与 CoMP模式特有的发 送模式和 /或 CoMP模式特有的资源绑定。 进一歩地， 协作小区需要把 CoMP专有的 CoMP-ID、 UE-ID、 Anchor Cell-ID通知处于 CoMP状态的终端， 还可以进一步通知彼此 协作的协作小区， 协作小区还可以通知 Serving Cell-ID。
本实施例对于上述多个标识，可以根据不同的应用场景采用不同的标识作为主导标 识。 选定对应的标识作为主导标识之后， 可以按照主导标识对应的规则配置和执行， 还 可以同时执行多个标识对应的规则，但多个标识同时对应的规则需要遵循主导标识对应 的规则。 对于上述多个标识， 具体选用哪个标识作为主导标识， 可以由主小区确定， 也 可以由各个协作小区协商确定， 还可以由预先设定的小区确定， 还可以进一步由终端确 定。 下面以 PRB为例， 分两个具体实例来说明控制物理资源的分配过程。 假设小区 1 (Celll ) 和小区 2 (Cell2) 组成 CoMP协作小区。 终端 1-1 (UE1-1 ) 和终端 1-2 (UE1-2) 属于 Celll (设 Cell-ID1 = 1 )， 终端 2-1 (UE2-1 )属于 Cell2 (设 Cell-ID2=2)。其中， UE1-1 和 UE2-1为处于 CoMP状态的终端， 被 Celll和 Cell2协作服务； UE1-2为处于非 CoMP状态 的终端， 属于普通状态的终端， 只被 Celll服务。
实例 1 :
Celll和 Cell2划分出对应相同的 PRB作为 CoMP的专用 PRB, 只有给处于 CoMP状态 的终端即 UE1-1和 UE2-1发送信息的信道可以使用该专用 PRB。 Celll和 Cell2将这两部分 的专用 PRB可以组成一个虚拟小区， 并分配一个特别的 CoMP小区标识即 CoMP-ID来标 识 （H^CoMP-ID = 100)。
CoMP-ID被配置给 Celll和 Cell2， UE1-1和 UE2-1从属于 CoMP-ID= 100的 CoMP虛拟 小区。 UE1-1和 UE2-1被通知了 CoMP-ID，进一步， UE1-1还被通知了 Cell-ID 1、以及 UE2-1 也被通知了 Cell-ID2。
协作小区进一步根据 CoMP-ID获取的 CoMP-ID对应的 PRB和相应的下行 PRB映射规 贝 I」， 并利用 PRB发送 CoMP下行控制信息。 同时 UE1-1可以接收 Cdll的小区配置的其它 信息， UE2-1也可以接收 Cell2的小区配置的其它信息， 例如： 下行广播信息等。
实例 2:
Cell 1给 UE 1 - 1和 UE 1 -2分配 PRB； Ce〖12给 UE2- 1分配 PRB。 在 Cell 1和 Cell2分配时， 进行协调，使得 UE1-1和 UE2-1的 PRB可以协作进行 CoMP;同时 Celll给 UE1-2分配的 PRB 不会与处于 CoMP状态的 UE1-1和 UE2-1的 PRB冲突影响。 例如： 分配的 UE1-1和 UE2-1 的物理下行控制信道分别对应不同的 PRB上， 以避免彼此的干扰。 而 UE1-2也被分配到 了与 UE2- 1不同的 PRB上， 但 UE 1 - 1和 UE2- 1可以分配在同一个 PRB上。
本实施例的下行信息是由多个协作小区所协商的物理下行信道进行发送的， 进行协 作分配控制下行物理资源的协作小区可以是进行 CoMP的虚拟小区内的所有协作小区， 还可以是进行 CoMP的虚拟小区内的某些协作小区。
本实施例通过多个协作小区协作传输的方式， 由多个协作小区协作分配物理下行信 道对应的小区标识， 根据该小区标识获得对应的下行物理资源及下行映射规则， 实现由 多个协作小区下发物理下行信道， 以提高协作小区的有效覆盖范围， 同时， 各协作小区 通过协商可以避免协作小区各自独立发送下行物理信道时造成的相互干扰问题。
图 8为本发明第八实施例的方法流程示意图， 本实施例以 PBCH为例， 包括- 步骤 81 : 网络设备 （例如基站） 获取协作小区协商的 PBCH所对应的 PBCH物理 资源和 PBCH映射规则及发送模式。
步骤 82、 网络设备根据所述 PBCH映射规则将所述 PBCH映射到 PBCH物理资源。 步骤 83: 利用 PBCH传输 PBCH信息。
本实施例中， 假如小区 1和小区 2联合为 UE1和 UE2来服务， 这里 UE1， UE2既 属于小区 1也属于小区 2， UE1和 UE2即所述 CoMP UE。 这样可以有以下方法，
( 1 ) UE1和属于小区 1的其它非 CoMP用户的 PBCH联合进行映射到小区 1的物 理资源， UE1和属于小区 2的其它非 CoMP用户的 PBCH联合进行映射到小区 2的物 理资源， 然后小区 1和小区 2各自独立进行发送；
(2) UE1和属于小区 1的其它非 CoMP用户的 PBCH分别进行映射到小区 1的物 理资源， UE1和属于小区 2的其它非 CoMP用户的 PBCH分别进行映射到小区 2的物 理资源
(3 ) UE1和属于小区 1的其它非 CoMP用户的 PBCH分别进行映射到小区 1的不 同的物理资源 （如不同的 OFDM符号， 不同的 RB,不同的载波等）， UE1和属于小区 2 的其它非 CoMP用户的 PBCH分别进行映射到小区 2的不同的物理资源
(4) UE1和 UE2的 PBCH联合映射， 可以由协作小区中的单个小区发送或多个小 区同时发送， 其它协作小区对应的物理资源位置不发送信息。
上述几种方法， 属于同一 UE的控制信息可以由协作小区中的单个小区发送或多个小 区同时发送。
本实施例中， 协商控制物理资源的协作小区可以是主小区、 系统配置的服务小区或 终端选择的服务小区。 具体地， 协作小区可以静态配置控制物理资源， 还可以根据业务 需求和 /或负载动态配置控制物理资源。本实施例中协作小区所协商出的控制物理资源可 以为协作小区对应的全部控制物理资源， 还可以为协作小区对应的部分控制物理资源， 各个协作小区其发送模式可以应用各种发送分集模式， 例如： SFBC (Spatial Frequency Block Coding, 空频分组码）、 CDD ( Cyclic Delay Diversity, 循环延迟分集） 等。
本实施例中，下行资源按照类型包括载波、子载波、物理资源块、子帧、时隙、 OFDM 符号、 序列、 序列偏移、 序列梳齿、 跳频图案、 周期、 扰码中的一种或多种， 各协作小 区采用的上述各资源 （即序列、 序列偏移等） 可以相同或不同。 所述子帧包括 LTE UE 可区分的非普通业务对应的子帧和持续调度子帧， 所述 LTE UE可区分的非普通业务对 应的子帧包括 MBSFN子帧， 所述持续调度子帧包括 VoIP子帧。 所述载波包括载波聚 合中的指定载波。
本实施例中， 联合为终端服务的小区可以是主小区， 或由系统配置的小区， 或 UE 选择的小区或者根据业务状态和信道状况等基站动态分配的或所有服务的小区
本实施例中，不同协作小区协作进行物理广播信道资源分配和映射和 /或加扰，其所 用的资源可以各自独立分配和映射和 /或加扰;或者不同协作小区的资源釆用同一组物理 广播信道资源， 统一进行分配和映射和 /或加扰。 均不影响本实施例的实施。
本实施例通过釆用多个协作小区协作传输的方式， 由多个协作小区协作分配 PBCH 对应的下行物理资源及下行映射规则， 实现由多个协作小区下发物理下行信道， 以提高 协作小区的有效覆盖范围， 同时， 各协作小区通过协商可以避免协作小区各自独立发送 下行物理信道时造成的相互干扰问题。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤可以通过程 序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读取存储介质中， 该程序 在执行时， 执行包括上述方法实施例的步骤； 而前述的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介质。
图 9为本发明第八实施例的网络设备的结构示意图， 包括获取模块 91、 和发送模块 92。获取模块 91用于获取协作小区协商的物理下行信道和 /或参考信号所对应的下行物理 资源和下行映射规则及发送模式； 发送模块 92与获取模块 91连接， 用于根据所述下行映 射规则将所述物理下行信道和 /或参考信号映射到下行物理资源上发送给终端。
其中上述模块中涉及的参数可以参见方法实施例中的对应参数， 不再赘述。
本实施例通过多个协作小区协作传输的方式， 由多个协作小区协作分配物理下行信 道对应的小区标识， 根据该小区标识获得对应的下行物理资源及下行映射规则， 实现由 多个协作小区下发物理下行信道， 以提高协作小区的有效覆盖范围， 同时， 各协作小区 通过协商可以避免协作小区各自独立发送下行物理信道时造成的相互干扰问题。
进一步地， 本发明实施例还提供了一种无线系统， 包括网络设备， 用于获取协作小 区协商的物理下行信道和 /或所对应的下行物理资源和下行映射规则；根据所述下行映射 规则将所述物理下行信道和 /或映射到下行物理资源上发送给终端。该网络设备可以为第 四实施例所述的网络设备。
本实施例通过多个协作小区协作传输的方式， 由多个协作小区协作分配物理下行信 道对应的小区标识， 根据该小区标识获得对应的下行物理资源及下行映射规则， 实现由 多个协作小区下发物理下行信道， 以提高协作小区的有效覆盖范围， 同时， 各协作小区 通过协商可以避免协作小区各自独立发送下行物理信道时造成的相互干扰问题。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案而非对其进行限制， 尽 管参照较佳实施例对本发明进行了详细的说明， 本领域的普通技术人员应当理解： 其依 然可以对本发明的技术方案进行修改或者等同替换， 而这些修改或者等同替换亦不能使 修改后的技术方案脱离本发明技术方案的精神和范围。

Claims

权利要求
1、 一种协作多点传输系统中的下行传输方法， 其特征在于， 包括- 确定协作小区协商的物理下行信道和 /或参考信号所对应的下行物理资源和下行映 射规则；
根据所述下行映射规则将所述物理下行信道和 /或参考信号映射到所述下行物理资 源上发送给终端。
2、 根据权利要求 1所述的方法， 其特征在于，
所述物理下行信道包括： 物理下行控制信道、 物理控制格式指示信道、 物理多播信 道、 物理广播信道、 同步信道、 物理下行共享信道中的一种或多种； 和 /或
所述参考信号包括： 公共参考信号和 /或专用参考信号； 和 /或
所述下行物理资源包括： 载波、 子载波、 物理资源块、 子帧、 时隙、 序列、 序列偏 移、 序列梳齿、 跳频图案、 周期、 扰码中的一种或多种。
3、 根据权利要求 1所述的方法， 其特征在于，
所述确定协作小区协商的物理下行信道和 /或参考信号对应的下行物理资源和下行 映射规则， 包括：
获取与所述下行物理资源和所述下行映射规则对应的标识，其中所述标识包括以下 之一： 协作多点标识、 终端标识、 主小区标识、 服务小区标识；
根据所述标识确定所述协作小区协商的物理下行信道和 /或参考信号对应的下行物 理资源和下行映射规则；
或者，所述确定协作小区协商的物理下行信道和 /或参考信号对应的下行物理资源和 下行映射规则， 包括：
获取与所述下行物理资源和所述下行映射规则对应的多个标识，其中所述标识包括 以下之一或其任意组合： 协作多点标识、 终端标识、 主小区标识、 服务小区标识； 在多个标识中确定一个主导标识， 根据所述主导标识确定相应的下行物理资源和下 行映射规则。
4、 根据权利要求 1所述的方法， 其特征在于， 还包括：
确定协作小区协商的物理下行信道和 /或参考信号所对应的发送模式，所述发送模式 包括发送给同一终端的物理下行信道由一个协作小区发送， 或者由多个协作小区联合发 送； 其中在所述发送模式包括由多个协作小区联合发送时， 所述发送模式还包括由多个 协作小区联合发送所用的分集方式， 或者复用方式。
5、 根据权利要求 1所述的方法， 其特征在于， 所述将所述物理下行信道和 /或参考 信号映射到下行物理资源包括- 将多个协作小区的多个协作用户对应的物理下行信道和 /或参考信号联合映射到所 述多个协作小区中的一个协作小区的下行物理资源； 或者
将多个协作小区的多个协作用户对应的物理下行信道和 /或参考信号联合映射到所 述多个协作小区中的至少两个协作小区的下行物理资源； 或者
将多个协作小区的多个协作用户对应的物理下行信道和 /或参考信号与第一协作小 区的一个或多个非协作用户的物理下行信道和 /或参考信号联合映射到所述第一协作小 区的下行物理资源， 其中所述第一协作小区为所述多个协作小区中的一个协作小区； 或 者
将协作小区的协作用户和非协作用户对应的物理下行信道和 /或参考信号联合映射 到所述协作小区的下行物理资源； 或者
将多个协作小区中每个协作小区的协作用户对应的物理下行信道分别映射到所述 协作用户所属的协作小区的下行物理资源。
6、 根据权利要求 1所述的方法， 其特征在于， 当所述物理下行信道为物理下行控制 信道时，所述根据所述下行映射规则将所述下行物理信道和 /或参考信号映射到下行物理 资源上发送给终端， 包括： 主小区， 或由系统配置的小区， 或 UE选择的小区， 或基站 动态分配的小区， 或所有协作小区， 采用分集方式或者复用方式根据所述下行映射规则 将所述下行物理控制信道映射到下行物理资源上发送给终端。
7、 根据权利要求 1所述的方法， 其特征在于， 所述根据所述下行映射规则将所述参 考信号映射到下行物理资源上发送给终端， 包括： 根据所述下行映射规则， 不同协作小 区分别将属于第二协作小区的不同天线口对应的参考信号映射到下行物理资源上发送 给终端， 所述第二协作小区为所述不同协作小区中的任意一个。
8、 根据权利要求 1 所述的方法， 其特征在于， 所述协作小区协商的物理下行信道 和 /或参考信号所对应的所述下行映射规则中， 各协作小区的下行映射规则都相同。
9、 根据权利要求 1 所述的方法， 其特征在于， 所述下行映射规则包括以下之一或 其任意组合： 从虛拟资源块到物理资源块的映射规则， 所述协作小区中的服务小区将在 发送参考信号的位置发送的数据打掉， 对参考信号进行功率抬升的处理。
10、 根据权利要求 1所述的方法， 其特征在于， 当所述物理下行信道为物理下行控 制信道时， 所述方法还包括： 将所述物理下行控制信道占用的符号数通知给终端， 所述 占用的符号数为各协作小区发送的物理下行控制信道占用的符号数中的最大值。
11、 一种网络设备， 其特征在于， 包括- 获取模块，用于获取协作小区协商的物理下行信道和 /或参考信号所对应的下行物理 资源和下行映射规则；
发送模块， 与所述获取模块连接， 用于根据所述下行映射规则将所述物理下行信道 和 /或参考信号映射到所述下行物理资源上发送给终端。
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