WO2012065510A1 - 一种物理下行控制信道符号数量的配置方法及装置 - Google Patents

一种物理下行控制信道符号数量的配置方法及装置 Download PDF

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Publication number
WO2012065510A1
WO2012065510A1 PCT/CN2011/081573 CN2011081573W WO2012065510A1 WO 2012065510 A1 WO2012065510 A1 WO 2012065510A1 CN 2011081573 W CN2011081573 W CN 2011081573W WO 2012065510 A1 WO2012065510 A1 WO 2012065510A1
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WIPO (PCT)
Prior art keywords
relay station
backhaul
pdcch
symbols
link
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PCT/CN2011/081573
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English (en)
French (fr)
Inventor
梁枫
毕峰
袁明
杨瑾
吴栓栓
朱常青
Original Assignee
刘建
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Publication of WO2012065510A1 publication Critical patent/WO2012065510A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for configuring the number of symbols in a physical downlink control channel. Background technique
  • the link between the user participating in the service and the relay station of the relay station is called an access link, and the link between the relay station and the base station is called a backhaul link.
  • one downlink or uplink subframe includes 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols or SC-FDMA (single carrier) -Frequency Division Multiple Access, single symbol-frequency division multiple access) symbol, ie from symbol 0 to symbol 13 (in the description of the present invention, OFDM Symbol or SC-FDMA symbol, which may be simply referred to as a symbol).
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA single carrier -Frequency Division Multiple Access, single symbol-frequency division multiple access
  • the TDD (Time Division Duplex) mode in addition to the uplink subframe and the downlink subframe, there is a special subframe that includes a guard interval. Taking the length of the CP into account, the lengths of the symbols 0 and 7 are 22 G ⁇ T s , and the lengths of the other symbols are; if an extended CP ( Extended cyclic prefix) is used in the subframe, 1 subframe contains 12 Symbol, taking the length of the CP into account,
  • the backhaul link, the access link, and the direct transmission link all operate on the same spectrum.
  • the relay subframe is divided into a backhaul subframe and an access subframe, and the downlink and uplink transmissions of the backhaul link of the relay station are performed on the downlink and uplink backhaul subframes respectively, and the downlink and uplink transmissions of the access link are respectively performed. Performed on the downlink and uplink access subframes.
  • the relay station For the downlink backhaul subframe, the relay station needs to perform downlink transmission of the access link on 1 or 2 OFDM symbols before the subframe, and perform downlink reception of the backhaul link on the remaining available resources.
  • the CP configuration of the backhaul subframe and the access subframe is the same.
  • the guard interval consumes a part of the backhaul resource, resulting in waste of resources.
  • the resource waste can be reduced by limiting the transmission range of the backhaul subframe and adjusting the configuration of the access link timing and guard interval.
  • timing refers to the time start or end point of the network node transmitting or receiving.
  • the relay station For the downlink timing of the relay station, it is set on the downlink backhaul subframe, and the relay station is from the OFDM symbol m. Start receiving the backhaul link downlink transmission until the end of the symbol n, and k is the number of symbols used by the relay station to perform downlink transmission of the access link on the downlink backhaul subframe, and is also equal to the physical downlink control of the access link on the backhaul subframe. The number of symbols for the channel (PDCCH). Then the definition of the downlink timing scenario of the relay station is as follows:
  • the transmission timing of the downlink access link of the relay station is asynchronous with the downlink transmission timing of the base station, specifically, the transmission timing of the downlink access link of the relay station is compared with the reception timing of the downlink backhaul link. Delay for a period of time (downlink fixed delay).
  • Downlink timing scenario 3 On the downlink backhaul subframe, the relay station can receive the backhaul downlink transmission from the OFDM symbol m > k until the symbol n ⁇ 13 ends (depending on the base station to relay propagation delay and the relay station's radio frequency conversion delay) At this time, the transmission timing of the downlink access link of the relay station is synchronized with the downlink transmission timing of the base station.
  • the backhaul transmission range in the downlink backhaul subframe depends only on the relay station and the base station.
  • Spread delay Specifically, for example, when the propagation delay is about 0-624, the relay station may receive the backhaul downlink transmission from the OFDM symbol k+1 until the symbol 12 (normal CP) or the symbol 10 (extended CP) ends.
  • Sub-scene A called downlink timing scenario 3; when the propagation delay is about 624 ⁇ 1568 (normal CP) or
  • the relay station may receive the backhaul link downlink transmission from the OFDM symbol k until the symbol 12 (normal CP) or the symbol 10 (extended CP) ends, which may be referred to as downlink timing scenario 3 Sub-scene B; when the propagation delay exceeds approximately 1568 (normal CP) or 1936 (extended CP), the relay station may receive the backhaul link downlink transmission from the OFDM symbol k until the symbol n ⁇ 12 ends, and with the propagation delay The increase, n will decrease, this situation can be called sub-scene C of the downlink scene 3.
  • the backhaul subframe transmission start position that the relay station can receive indicates that the relay station can receive the backhaul link transmission at the earliest position, and the backhaul link transmission after the location and the location can be normally received, before the location The backhaul link transmission cannot be normally received.
  • Table 1 shows the downlink timing scenario and the backhaul subframe transmission start position that the relay station can receive, as shown in Table 1, where k is 1 or 2:
  • the relay station Since the receiving mode such as demodulation and decoding is required, the relay station must know the downlink transmission starting position of the backhaul link to perform normal reception.
  • the protocol The R-PDCCH starting point position of the relay physical downlink control channel of the backhaul link is fixed to symbol 3, and the starting position of the (relay) physical downlink shared channel (R-) PDSCH of the backhaul link is configured by higher layer signaling.
  • the specific configuration range of the starting point of the backhaul link transmission includes symbol 1, symbol 2 and symbol 3.
  • the set of symbols of the PDCCH that is, the k-value configuration set includes ⁇ 1 ⁇ , ⁇ 2 ⁇ , or ⁇ 1, 2 ⁇ ( ⁇ x ⁇ indicates that the PDCCH can be configured as X symbols), which is dynamically configured by the physical layer in a certain configuration set. Therefore, the configuration of the starting point position of the backhaul link transmission and the configuration of the number of PDCCH symbols of the access link on the backhaul subframe are likely to cause a collision, causing the transmission to fail.
  • the starting position of the backhaul link transmission is configured as symbol 2
  • the relay station in the downlink timing scenario 1 the earliest can only receive the backhaul link transmission from the symbol k+1, that is, the symbol 3, then at this time
  • the backhaul link transmission on symbol 2 will not be received normally on the relay station, which may cause the entire backhaul link on the backhaul subframe to fail to receive.
  • the downlink backhaul subframe structure is as shown in FIG. 2.
  • the main object of the present invention is to provide a method and a device for configuring the number of physical downlink control channel symbols, which can solve the problem that the downlink transmission of the backhaul link in the prior art may not be normally received on the relay station.
  • the relay station acquires a starting position of the downlink transmission of the backhaul link
  • the starting position of the downlink transmission of the backhaul link received by the relay station is not later than the starting position of the downlink transmission of the backhaul link.
  • the embodiment of the invention further provides a device for configuring the number of physical downlink control channel symbols, including: an acquiring module and a configuration module;
  • Acquisition module used to obtain a starting position of a downlink transmission of the backhaul link
  • a configuration module configured to determine, according to the starting location, a configuration set of the number of PDCCH symbols of the access link in the backhaul subframe, and configured, in the determined configuration set, the number of PDCCH symbols of the access link in the backhaul subframe,
  • the starting position of the downlink transmission of the received backhaul link is no later than the starting position of the downlink transmission of the backhaul link. Due to the solution provided by the embodiment of the present invention, the starting position of the downlink transmission of the backhaul link that the relay station can receive in the backhaul subframe is no later than the starting position of the downlink transmission of the backhaul link, and thus the downlink transmission of the backhaul link does not occur at the relay station. The phenomenon that it cannot be received normally.
  • FIG. 1 is a structural diagram of a relay network in the prior art
  • FIG. 1 is a structural diagram of a downlink backhaul subframe in the prior art
  • FIG. 3 is a flowchart of a method according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of a device according to an embodiment of the present invention. detailed description
  • the basic idea of the present invention is: a relay station acquires a starting position of a downlink transmission of a backhaul link; and the relay station determines, according to the starting point position, a configuration set of the number of PDCCH symbols of an access link in a backhaul subframe; the relay station determines the determined In the configuration set, the configuration of the number of PDCCH symbols of the access link in the backhaul subframe is performed; where the starting position of the downlink transmission of the backhaul link received by the relay station is no later than the starting position of the downlink transmission of the backhaul link.
  • the main flow of the method for configuring the number of physical downlink control channel symbols in this embodiment is as shown in FIG. 3, and the method includes the following steps:
  • Step 101 The relay station acquires a starting position of a downlink transmission of the backhaul link
  • the relay station can obtain the downlink transmission starting point position of the backhaul link by receiving the high layer signaling of the backhaul link; wherein the parameter "Backhaul-DL-StartSymbol" in the high layer signaling indicates the starting position of the downlink transmission of the backhaul link, Symbol 1, Symbol 2 or Symbol 3.
  • Step 102 The relay station determines, according to the obtained starting position of the downlink transmission of the backhaul link, a configuration set of the number of access link PDCCH symbols in the backhaul subframe.
  • the configuration set of the number of access link PDCCH symbols in the backhaul subframe includes ⁇ 1 ⁇ , ⁇ 2 ⁇ Or ⁇ 1, 2 ⁇ , where ⁇ x ⁇ indicates that the PDCCH can be configured as X symbols, for example, ⁇ 1, 2 ⁇ indicates that the PDCCH can be configured as 1 or 2 symbols, and ⁇ 2 ⁇ indicates that the PDCCH can be configured as 2 symbols. a symbol, ⁇ 1 ⁇ indicates that the PDCCH can be configured as 1 symbol;
  • the relay station determines that the configuration set of the number of symbols of the backhaul subframe access link PDCCH is ⁇ 1 ⁇ ; when the starting position of the backhaul link transmission is the symbol 2 The relay station determines a configuration set of the number of symbols of the backhaul subframe access link PDCCH as ⁇ 1 ⁇ or ⁇ 2 ⁇ or ⁇ 1, 2 ⁇ ; when the start position of the backhaul link transmission is symbol 3, the relay station determines the backhaul subframe The configuration set of the number of symbols of the access link PDCCH is ⁇ 2 ⁇ or ⁇ 1, 2 ⁇ ;
  • the relay station determines, according to the starting location of the downlink transmission of the backhaul link, the configuration set of the number of access link PDCCH symbols in the backhaul subframe according to the timing scenario type and/or the cell-specific cell-specific antenna port number;
  • the timing scene type is the timing scene 1, the sub-scene person of the timing scene 3, and the sub-scene B of the timing scene 3.
  • the transmission timing of the downlink access link of the relay station is asynchronous with the downlink transmission timing of the base station.
  • the starting position of the downlink transmission of the backhaul link that the relay station can receive is the symbol k + 1; in the sub-scene A of the downlink timing scenario 3, the transmission timing of the downlink access link of the relay station is synchronized with the downlink transmission timing of the base station, and the relay station
  • the starting position of the downlink transmission of the backhaul link capable of receiving is the symbol k + 1; in the sub-scene B of the downlink timing scenario 3, the transmission timing of the downlink access link of the relay station is synchronized with the downlink transmission timing of the base station, and the relay station can receive
  • the starting position of the downlink transmission of the backhaul link is the symbol k.
  • the k represents the number of symbols of the access link PDCCH on the backhaul subframe, and the value includes 1 or 2;
  • the relay station determines the backhaul subframe access The configuration set of the symbol number of the link PDCCH is ⁇ 1 ⁇ ; when the start position of the backhaul link transmission is symbol 2, and when the number of cell-specific antenna ports of the relay station is 1 or 2, and the relay station is in downlink timing scenario 1 or downlink timing Subfield of scene 3
  • the relay station determines a configuration set of the number of symbols of the backhaul subframe access link PDCCH as ⁇ 1 ⁇ ; when the back link transmission starts at the symbol 2, and when the relay station cell-specific antenna port number is 1 or 2
  • the relay station determines that the configuration set of the number of symbols of the backhaul subframe access link PDCCH is ⁇ 1, 2 ⁇ ;
  • the relay station determines the symbol of the backhaul subframe access link PDCCH.
  • the set of configurations for the number is ⁇ 2 ⁇ ;
  • the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH as ⁇ 1, 2 ⁇ ;
  • the relay station determines that the configuration set of the number of symbols of the backhaul subframe access link PDCCH is ⁇ 2 ⁇ .
  • Step 103 The relay station performs configuration of the number of access link PDCCH symbols in the backhaul subframe in the determined configuration set.
  • the relay station may configure the number of access link PDCCH symbols in the backhaul subframe to be 1 in the determined configuration set ⁇ 1 ⁇ ;
  • the relay station may configure the number of access link PDCCH symbols in the backhaul subframe to 2 in the determined configuration set ⁇ 2 ⁇ ;
  • the starting position of the downlink transmission of the backhaul link that the relay station can receive in the backhaul subframe is not later than the starting point of the downlink transmission of the backhaul link. position.
  • the relay station can receive the backhaul link downlink transmission.
  • the following is done in different embodiments - description.
  • Embodiment 1 The starting point of the downlink transmission of the relay station acquiring the backhaul link is symbol 1, and the number of cell-specific antenna ports of the relay station is 1, and the relay station operates under the sub-scene B of the downlink timing scenario 3, at which time, the relay station determines the backhaul
  • the configuration set of the number of symbols of the subframe access link PDCCH is ⁇ 1 ⁇ , and the backhaul subframe access link PDCCH is further configured in the configuration set to be 1 symbol.
  • Embodiment 2 The starting point of the downlink transmission of the relay station acquiring the backhaul link is symbol 2, and the number of the cell-specific antenna port of the relay station is 2, and the relay station operates in the downlink timing scenario 1, at this time, the relay station determines the backhaul subframe access link.
  • the configuration set of the symbol number of the PDCCH is ⁇ 1 ⁇ , and the backhaul subframe access link PDCCH is further configured to be one symbol in the configuration set.
  • Embodiment 3 The starting point of the downlink transmission of the relay station acquiring the backhaul link is symbol 2, and the number of the cell-specific antenna port of the relay station is 1, and the relay station operates in the sub-scene A of the downlink timing scenario 3, at this time, the relay station determines the backhaul subframe.
  • the configuration set of the number of symbols of the access link PDCCH is ⁇ 1 ⁇ , and the backhaul subframe access link PDCCH is further configured in the configuration set to be 1 symbol.
  • Embodiment 4 The starting point of the downlink transmission of the relay station acquiring the backhaul link is symbol 2, and the number of the cell-specific antenna port of the relay station is 1, and the relay station operates in the sub-scene B of the downlink timing scenario 3, at which time, the relay station determines the backhaul subframe.
  • the configuration set of the number of symbols of the access link PDCCH is ⁇ 1, 2 ⁇ , and the backhaul subframe access link PDCCH is further configured in the configuration set to be one symbol.
  • Embodiment 5 The relay station acquires the downlink transmission of the backhaul link.
  • the starting position is the symbol 2, and the number of the cell-specific antenna ports of the relay station is 2, and the relay station operates in the sub-scene B of the downlink timing scenario 3.
  • the relay station determines that the configuration set of the number of symbols of the backhaul subframe access link PDCCH is ⁇ 1, 2 ⁇ , and further configuring the backhaul subframe access link PDCCH to be 2 in the configuration set.
  • Embodiment 6 The starting position of the downlink transmission of the relay station acquiring the backhaul link is symbol 2, and The relay station operates in the sub-scenario B of the downlink timing scenario 3, and the relay station determines that the configuration set of the number of symbols of the backhaul subframe access link PDCCH is ⁇ 2 ⁇ , and The backhaul subframe access link PDCCH is further configured in the configuration set to be 2 symbols.
  • Embodiment 7 The starting point of the downlink transmission of the relay station acquiring the backhaul link is symbol 3, and the number of the cell-specific antenna port of the relay station is 2. At this time, the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH is ⁇ 1, 2 ⁇ , and further configuring the backhaul subframe access link PDCCH into one symbol in the configuration set.
  • Embodiment 8 The starting point of the downlink transmission of the relay station acquiring the backhaul link is symbol 3, and the number of the cell-specific antenna port of the relay station is 2. At this time, the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH is ⁇ 1, 2 ⁇ , and further configuring the backhaul subframe access link PDCCH into 2 symbols in the configuration set.
  • Embodiment 9 The starting point of the downlink transmission of the relay station acquiring the backhaul link is symbol 3, and the number of the cell-specific antenna port of the relay station is 4, and the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH. It is ⁇ 2 ⁇ , and the backhaul subframe access link PDCCH is further configured in the configuration set to be 2 symbols.
  • the foregoing embodiment is only a preferred solution in the embodiment of the present invention.
  • the relay station acquires the starting position of the downlink transmission of the backhaul link, according to the starting position of the downlink transmission of the backhaul link, and further according to the timing scenario type. And/or the number of cell-specific antenna ports, and configure the number of PDCCH symbols of the backhaul subframe access link.
  • the embodiment of the invention further provides a device for configuring the number of physical downlink control channel symbols. As shown in FIG. 4, the device includes:
  • the obtaining module 201 is configured to acquire a starting position of a downlink transmission of the backhaul link
  • the configuration module 202 is configured to: determine, according to the starting location, a configuration set of the number of access link PDCCH symbols in the backhaul subframe, and perform, in the determined configuration set, a configuration of the number of access link PDCCH symbols in the backhaul subframe, where , the starting position of the downlink transmission of the received backhaul link, not It is later than the starting position of the downlink transmission of the backhaul link.
  • the configuration module 202 is further configured to: determine, according to the starting position, a configuration set of the number of access link PDCCH symbols in the backhaul subframe, where the configuration set of the number of access link PDCCH symbols in the backhaul subframe is the first set, the second Collection or third collection;
  • the number of symbols that the backhaul subframe access link PDCCH can be configured has a value of 1; in the second set, the number of symbols that the backhaul subframe access link PDCCH can be configured has a value of 2; In the set, the number of symbols that the backhaul subframe access link PDCCH can be configured takes a value of 1 or 2.
  • the configuration module further includes a first configuration sub-module 2021, configured to: when the starting position of the backhaul link transmission is the symbol 1, the relay station determines that the configuration set of the number of symbols of the backhaul subframe access link PDCCH is the first set;
  • the configuration module further includes a second configuration sub-module 2022, configured to determine, when the start position of the backhaul link transmission is the symbol 2, the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH as the first set or the second set. Or the third set;
  • the configuration module further includes a third configuration sub-module 2023, configured to determine, when the start position of the backhaul link transmission is the symbol 3, the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH as the second set or the third set. ;
  • the configuration module further includes a fourth configuration sub-module 2024, configured to determine an access link PDCCH symbol in the backhaul subframe according to a starting location of the downlink transmission of the backhaul link, and a timing scenario type and/or a cell-level cell-specific antenna port number. A collection of configurations.
  • the configuration module 202 is further configured to: when the starting position of the backhaul link transmission is the symbol 1, the relay station determines that the configuration set of the number of symbols of the backhaul subframe access link PDCCH is the first set.
  • the configuration module 202 is further configured to: when the starting position of the backhaul link transmission is the symbol 2, the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH as the first set or the second set or the third set. . Further, the configuration module 202 is further configured to: when the starting position of the backhaul link transmission is the symbol 3, the relay station determines that the configuration set of the number of symbols of the backhaul subframe access link PDCCH is the second set or the third set.
  • the configuration module 202 is further configured to: use the relay station timing scenario type and/or the cell-specific antenna port number to determine a configuration set of the number of access link PDCCH symbols in the backhaul subframe, and the timing scenario type is the timing scenario 1 and the timing scenario 3 Sub-Scenario A or Sub-Scenario B of Timing Scenario 3;
  • the transmission timing of the downlink access link of the relay station is asynchronous with the downlink transmission timing of the base station, and the starting point of the downlink transmission of the backhaul link that the relay station can receive The position is the symbol k + 1 ;
  • the transmission timing of the downlink access link of the relay station is synchronized with the downlink transmission timing of the base station, and the starting position of the downlink transmission of the backhaul link that the relay station can receive is the symbol k + 1;
  • the transmission timing of the downlink access link of the relay station is synchronized with the downlink transmission timing of the base station, and the starting position of the downlink transmission of the backhaul link that the relay station can receive is the symbol k;
  • the k represents the number of symbols of the access link PDCCH on the backhaul subframe, and the value includes 1 or 2.
  • the configuration module 202 is further configured to: when the start position of the backhaul link transmission is the symbol 1, and when the number of the cell-specific (cell level) antenna ports of the relay station is 1 or 2, and the relay station is in the sub-scenario B of the downlink timing scenario 3
  • the relay station determines a configuration set of the number of symbols of the backhaul subframe access link PDCCH as the first set.
  • the configuration module 202 is further configured to: when the starting position of the backhaul link transmission is the symbol 2, the number of the cell-specific antenna ports of the relay station is 1 or 2, and the relay station is in the sub-scenario A of the downlink timing scenario 1 or the downlink timing scenario 3
  • the relay station determines a configuration set of the number of symbols of the backhaul subframe access link PDCCH as the first set.
  • the configuration module 202 is further configured to: when the start position of the backhaul link transmission is the symbol 2, The relay station cell-specific antenna port number is 1 or 2, and the relay station is in the sub-scenario B of the downlink timing scenario 3, and the relay station determines the configuration set of the symbol number of the backhaul subframe access link PDCCH as the third set.
  • the configuration module 202 is further configured to: when the start position of the backhaul link transmission is the symbol 2, the number of the cell-specific antenna ports of the relay station is greater than or equal to 4, and the relay station is in the sub-scene B of the downlink timing scenario 3, and the relay station determines the backhaul subframe connection.
  • the configuration set of the number of symbols of the ingress PDCCH is the second set.
  • the configuration module 202 is further configured to: when the starting position of the backhaul link transmission is the symbol 3, the number of the cell-specific antenna ports of the relay station is 1 or 2, and the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH as The third set.
  • the configuration module 202 is further configured to: when the starting position of the backhaul link transmission is the symbol 3, the number of the cell-specific antenna ports of the relay station is greater than or equal to 4, and the relay station determines the configuration set of the number of symbols of the backhaul subframe access link PDCCH is Two collections.

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Abstract

本发明提供一种物理下行控制信道PDCCH符号数量的配置方法，包括：中继站获取回程链路下行传输的起点位置；所述中继站根据所述起点位置，确定回程子帧中接入链路PDCCH符号数的配置集合；所述中继站在所确定的配置集合中，进行回程子帧中接入链路PDCCH符号数量的配置；其中，所述中继站接收的回程链路下行传输的起点位置，不晚于回程链路下行传输的起点位置；本发明还提供一种物理下行控制信道PDCCH符号数量的配置装置。根据本发明提供的技术方案，能够解决现有技术中的回程链路下行传输在中继站上可能无法正常接收问题。

Description

一种物理下行控制信道符号数量的配置方法及装置 技术领域
本发明涉及通信技术领域， 尤其涉及一种物理下行控制信道中符号数 量的配置方法及装置。 背景技术
中继技术作为一种新兴的技术， 引起了越来越广泛的注意， 被视为
B3G/4G的关键技术。 由于未来无线通信或蜂窝系统要求增加覆盖范围， 支 持更高速率传输， 这对无线通信技术提出了新的挑战。 同时， 系统建造和 维护的费用问题更加突出。 随着传输速率及通信距离的增加， 电池的耗能 问题也变得突出， 而且未来的无线通信将会采用更高频率， 由此造成的路 径损耗衰减更加严重。 通过中继技术， 可以将传统的单跳链路分成多个多 跳链路， 由于距离缩短， 这将极大地减小路径损耗， 有助于提高传输质量， 扩大通信范围， 从而为用户提供更快速更优质的服务。
如图 1 所示， 在中继网络中， 中继站参与服务的用户与中继站间的链 路被称为接入链路 ( Access Link ), 中继站与基站间的链路被称为回程链路
( Backhaul Link ), 基站参与服务的用户和基站之间的链路被称为直传链路
( Direct Link )。
在 LTE ( Long Term Evolution, 长期演进 )及其后续演进通信系统中 , 1个下行子帧或上行子帧的标准时间长度为 ^bfe^ ^^ T^ l毫秒。 若在子 帧中采用普通 CP ( Normal cyclic prefix, 循环前缀）， 则 1个下行或上行子 帧包含 14个 OFDM ( Orthogonal Frequency Division Multiplexing,正交频分 复用 )符号或者 SC-FDMA( single carrier-Frequency Division Multiple Access, 单载波 -频分多址）符号， 即从符号 0直到符号 13 (本发明描述中， OFDM 符号或者 SC-FDMA符号，可以简称为符号）。在 TDD( Time Division Duplex, 时分双工）模式下， 除了上行子帧和下行子帧之外， 还有一种特殊子帧， 该子帧中包含一段保护间隔。 将 CP长度计算在内， 符号 0和符号 7的长度 为 22G^Ts , 其他符号的长度为 ; 若在子帧中采用扩展 CP ( Extended cyclic prefix,循环前缀 ),则 1个子帧包含 12个符号，将 CP长度计算在内，
T -丄
每个符号的长度为 2560 。 其中 S 30720毫秒。 以下讨论若无说明， 均假 设为普通 CP配置。
对于带内中继 （ In-band relaying ), 回程链路、 接入链路和直传链路都 工作在相同的频谱上。 一般情况下， 为了避免中继站自身的接收端与发射 端之间产生干扰， 对于带内中继， 规定回程链路和接入链路上不能同时进 行下行或者上行的传输， 而必须在时间上错开。 因此， 对于中继站来说， 中继子帧分为回程子帧和接入子帧， 中继站的回程链路下行和上行传输分 别在下行和上行回程子帧上进行， 接入链路下行和上行传输分别在下行和 上行接入子帧上进行。 对于下行回程子帧， 中继站需要在该子帧前 1 或 2 个 OFDM符号上进行接入链路的下行发射， 并且在剩余可用资源上进行回 程链路的下行接收。 回程子帧和接入子帧的 CP配置相同。
并且， 由于中继站在进行下行发射与下行接收之间， 需要一定时间长 度的保护间隔， 并且该转换过程无法在 CP内完成， 因此， 保护间隔就会占 用一部分回程资源， 造成资源浪费。 为了保证尽量高的回程资源的利用率， 可以通过限制回程子帧的传输范围， 并调整接入链路的定时和保护间隔的 配置， 从而实现资源浪费的减少。 具体的， 不同的回程子帧传输范围限制 方案、 接入链路定时调整程度以及保护间隔的配置， 体现在不同的定时场 景中。 这里定时是指， 网络节点进行发射或接收的时间起点或终点。 目前， 中继站下行定时的可能场景有两个， 下行定时场景 1和下行定时场景 3。
对于中继站下行定时， 设在下行回程子帧上， 中继站从 OFDM符号 m 开始接收回程链路下行传输直到符号 n结束， 并且 k为中继站在该下行回 程子帧上进行接入链路的下行发射所使用的符号数， 也等于回程子帧上接 入链路物理下行控制信道（PDCCH ) 的符号数。 那么对中继站下行定时场 景的定义如下：
下行定时场景 1 : 在下行回程子帧上， 中继站可以从 OFDM符号 m = k + 1开始接收回程链路下行传输， 直到该子帧的最后一个符号（当采用普通 CP时， n = 13; 当采用扩展 CP时， n = ll )结束， 此时中继站下行接入链 路的发射定时与基站的下行发射定时异步， 具体为中继站下行接入链路的 发射定时相比下行回程链路的接收定时延迟一段时间 （下行固定时延）。
下行定时场景 3: 在下行回程子帧上， 中继站可以从 OFDM符号 m > k开始接收回程链路下行传输直到符号 n < 13结束（依赖于基站到中继站的 传播时延和中继站的射频转换时延）， 此时中继站下行接入链路的发射定时 与基站的下行发射定时同步。
根据目前下行场景 3的定义， 在下行场景 3 中， 由于中继站的射频转 换时延一般会规范为一个固定值， 因此， 此时下行回程子帧中的回程传输 范围仅依赖于中继站与基站间的传播时延。 具体的， 例如当传播时延约为 0-624 时， 中继站可以从 OFDM符号 k+1开始接收回程链路下行传输直到 符号 12 (普通 CP )或符号 10 (扩展 CP )结束， 这种情况可称作下行定时 场景 3 的子场景 A; 当传播时延约为 624 ~1568 (普通 CP ) 或
624^ -1936^ (扩展 CP )时， 中继站可以从 OFDM符号 k开始接收回程链 路下行传输直到符号 12 (普通 CP )或符号 10 (扩展 CP )结束， 这种情况 可称作下行定时场景 3的子场景 B; 当传播时延超过约 1568 (普通 CP ) 或 1936 (扩展 CP ) 时， 中继站可以从 OFDM符号 k开始接收回程链路 下行传输直到符号 n < 12结束， 并且随着传播时延的增加， n会减小， 这种 情况可称作下行场景 3的子场景 C。 各下行定时场景下， 中继站可以接收的回程子帧传输起点位置表示中 继站最早能够正常接收回程链路传输的位置， 在此位置及此位置之后的回 程链路传输可以正常接收， 在此位置之前的回程链路传输则不可以被正常 接收， 表 1 为下行定时场景与中继站可以接收的回程子帧传输起点位置， 如表 1所示， 其中 k的取值为 1或 2:
Figure imgf000006_0001
表 1
由于需要采用相应的解调解码等接收方式， 中继站必须获知回程链路 的下行传输起点位置才可以进行正常的接收， 目前， 为了更有效和顺利的 利用回程子帧上的回程链路资源， 协议规定回程链路的中继物理下行控制 信道 R-PDCCH起点位置固定为符号 3 , 并且回程链路的（中继）物理下行 共享信道（R- ) PDSCH的起点位置通过高层信令来进行配置， 并且回程链 路传输的起点位置具体配置范围包括符号 1、 符号 2和符号 3。
但是对于大带宽（即下行带宽大于 10个 RB( Resource Block,资源块）） 下的回程子帧接入链路， 其 PDCCH的符号数即 k值的配置集合包括 {1}、 {2}或 {1,2} ( {x}表示 PDCCH可被配置为 X个符号）， 由物理层在某一配置 集合中动态配置。 因此， 回程链路传输的起点位置配置与回程子帧上接入 链路的 PDCCH符号数的配置就很可能会产生沖突， 造成传输失败。 例如， 当回程链路传输的起点位置配置为符号 2 , 而回程子帧上接入链路的 PDCCH符号数的配置为 k=2时， 如上所述， 对于下行定时场景 1下的中继 站来说， 最早只能够从符号 k+1 即符号 3开始接收回程链路传输， 则此时 符号 2上回程链路传输在中继站上将无法正常接收， 从而可能导致该回程 子帧上整个回程链路接收失败， 下行回程子帧结构如图 2所示。
现有技术中存在问题如下， 由于回程链路传输的起点位置配置与回程 子帧上接入链路的 PDCCH符号数的配置很可能会产生沖突，回程链路下行 传输在中继站上可能无法正常接收。 发明内容
有鉴于此， 本发明的主要目的在于提供一种物理下行控制信道符号数 量的配置方法及装置， 能够解决现有技术中的回程链路下行传输在中继站 上可能无法正常接收问题。
本发明实施例提供的一种物理下行控制信道符号数量的配置方法， 包 括：
中继站获取回程链路下行传输的起点位置；
所述中继站根据所述起点位置，确定回程子帧中接入链路 PDCCH符号 数的配置集合；
所述中继站在所确定的配置集合中， 进行回程子帧中接入链路 PDCCH 符号数量的配置；
其中， 所述中继站接收的回程链路下行传输的起点位置， 不晚于回程 链路下行传输的起点位置。
本发明实施例还提供了一种物理下行控制信道符号数量的配置装置， 包括： 获取模块、 配置模块； 其中，
获取模块： 用于获取回程链路下行传输的起点位置；
配置模块： 用于根据所述起点位置， 确定回程子帧中接入链路 PDCCH 符号数的配置集合， 在所确定的配置集合中， 进行回程子帧中接入链路 PDCCH符号数量的配置， 其中， 接收的回程链路下行传输的起点位置， 不 晚于回程链路下行传输的起点位置。 由于本发明实施例提供的方案， 由于回程子帧中中继站能够接收的回 程链路下行传输的起点位置， 不晚于回程链路下行传输的起点位置， 进而 不会出现回程链路下行传输在中继站上无法正常接收的现象。 附图说明
图 1为现有技术中中继网络结构图；
图 1为现有技术中下行回程子帧结构图；
图 3为本发明实施例提供的方法流程图；
图 4为为本发明实施例提供的装置结构图。 具体实施方式
本发明的基本思想是： 中继站获取回程链路下行传输的起点位置； 所 述中继站根据所述起点位置，确定回程子帧中接入链路 PDCCH符号数的配 置集合； 所述中继站在所确定的配置集合中， 进行回程子帧中接入链路 PDCCH符号数量的配置； 其中， 所述中继站接收的回程链路下行传输的起 点位置， 不晚于回程链路下行传输的起点位置。
下面结合附图对本发明实施例的技术方案进行详细说明。
本实施方案的一种物理下行控制信道符号数量的配置方法主要流程如 图 3所示， 该方法包括以下步驟：
步驟 101 : 中继站获取回程链路下行传输的起点位置；
具体的， 中继站可以通过接收回程链路的高层信令来获取回程链路下 行传输起点位置； 其中， 高层信令中的参数 "Backhaul-DL-StartSymbol"指 示了回程链路下行传输起点位置， 为符号 1、 符号 2或符号 3。
步驟 102: 中继站根据所获取的回程链路下行传输的起点位置， 确定回 程子帧中接入链路 PDCCH符号数的配置集合；
具体的， 回程子帧中接入链路 PDCCH符号数的配置集合包括 {1 }、 {2} 或 {1,2} ,其中 {x}表示 PDCCH可被配置为 X个符号，例如 {1,2}表示 PDCCH 可被配置为 1或 2个符号， {2}表示 PDCCH可被配置为 2个符号， {1 }表示 PDCCH可被配置为 1个符号；
根据上述方法， 当回程链路传输的起点位置为符号 1 时， 中继站确定 回程子帧接入链路 PDCCH的符号数的配置集合为 {1 }； 当回程链路传输的 起点位置为符号 2时，中继站确定回程子帧接入链路 PDCCH的符号数的配 置集合为 {1 }或 {2}或 {1,2}； 当回程链路传输的起点位置为符号 3时， 中继 站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {2}或 {1,2}；
进一步的， 中继站根据回程链路下行传输的起点位置， 还要根据定时 场景类型和 /或小区级 cell-specific 天线端口数来确定回程子帧中接入链路 PDCCH符号数的配置集合；
定时场景类型为定时场景 1、 定时场景 3的子场景人、 定时场景 3的子 场景 B, 具体的， 在下行定时场景 1 中， 中继站下行接入链路的发射定时 与基站的下行发射定时异步， 并且中继站能够接收的回程链路下行传输的 起点位置为符号 k + 1 ; 在下行定时场景 3的子场景 A中， 中继站下行接入 链路的发射定时与基站的下行发射定时同步， 并且中继站能够接收的回程 链路下行传输的起点位置为符号 k + 1 ; 在下行定时场景 3的子场景 B中， 中继站下行接入链路的发射定时与基站的下行发射定时同步， 并且中继站 能够接收的回程链路下行传输的起点位置为符号 k。所述 k表示回程子帧上 接入链路 PDCCH的符号数， 取值包括 1或 2;
根据上述方法， 当回程链路传输的起点位置为符号 1 , 并且当中继站 cell-specific天线端口数为 1或 2,并且中继站处于下行定时场景 3的子场景 B时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {1}； 当回程链路传输的起点位置为符号 2, 并且当中继站 cell-specific天线 端口数为 1或 2,并且中继站处于下行定时场景 1或下行定时场景 3的子场 景 A时，中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 { 1 }； 当回程链路传输的起点位置为符号 2, 并且当中继站 cell-specific天线 端口数为 1或 2, 并且中继站处于下行定时场景 3的子场景 B时， 中继站 确定回程子帧接入链路 PDCCH的符号数的配置集合为 {1, 2} ;
当回程链路传输的起点位置为符号 2, 并且当中继站 cell-specific天线 端口数大于等于 4, 并且中继站处于下行定时场景 3的子场景 B时， 中继 站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {2}；
当回程链路传输的起点位置为符号 3 , 并且当中继站 cell-specific天线 端口数为 1或 2, 中继站确定回程子帧接入链路 PDCCH的符号数的配置集 合为 {1, 2}；
当回程链路传输的起点位置为符号 3 , 并且当中继站 cell-specific天线 端口数大于等于 4, 中继站确定回程子帧接入链路 PDCCH的符号数的配置 集合为 {2}。
步驟 103 : 中继站在所确定的配置集合中， 进行回程子帧中接入链路 PDCCH符号数量的配置；
具体的， 中继站在所确定的配置集合 {1 }中， 可以将回程子帧中接入链 路 PDCCH符号数量配置为 1 ;
中继站在所确定的配置集合 { 2 }中， 可以将回程子帧中接入链路 PDCCH符号数量配置为 2;
中继站在所确定的配置集合 { 1 , 2 }中， 可以将回程子帧中接入链路 PDCCH符号数量配置为 1或 2;
无论采用哪种方案配置回程子帧中接入链路 PDCCH符号的数量，原则 上要使回程子帧中中继站能够接收的回程链路下行传输的起点位置， 不晚 于回程链路下行传输的起点位置。
步驟 103之后， 中继站就可以接收回程链路下行传输。 下面以不同的实施例进行——说明。
实施例一、 中继站获取回程链路下行传输的起点位置为符号 1 , 并且中 继站小区级 cell-specific天线端口数为 1 , 中继站工作在下行定时场景 3的 子场景 B下， 此时， 中继站确定回程子帧接入链路 PDCCH的符号数的配 置集合为 {1} , 并在该配置集合中进一步配置回程子帧接入链路 PDCCH为 1个符号。
实施例二、 中继站获取回程链路下行传输的起点位置为符号 2, 并且中 继站 cell-specific天线端口数为 2, 中继站工作在下行定时场景 1下， 此时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {1} , 并在该 配置集合中进一步配置回程子帧接入链路 PDCCH为 1个符号。
实施例三、 中继站获取回程链路下行传输的起点位置为符号 2, 并且中 继站 cell-specific天线端口数为 1 , 中继站工作在下行定时场景 3的子场景 A下，此时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {1} ,并在该配置集合中进一步配置回程子帧接入链路 PDCCH为 1个符号。
实施例四、 中继站获取回程链路下行传输的起点位置为符号 2, 并且中 继站 cell-specific天线端口数为 1 , 中继站工作在下行定时场景 3的子场景 B下， 此时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {1, 2} , 并在该配置集合中进一步配置回程子帧接入链路 PDCCH为 1个符 实施例五、 中继站获取回程链路下行传输的起点位置为符号 2, 并且中 继站 cell-specific天线端口数为 2, 中继站工作在下行定时场景 3的子场景 B下， 此时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {1, 2} , 并在该配置集合中进一步配置回程子帧接入链路 PDCCH为 2个符 实施例六、 中继站获取回程链路下行传输的起点位置为符号 2, 并且中 继站 cell-specific天线端口数为 4, 中继站工作在下行定时场景 3的子场景 B下， 此时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {2} ,并在该配置集合中进一步配置回程子帧接入链路 PDCCH为 2个符号。
实施例七、 中继站获取回程链路下行传输的起点位置为符号 3 , 并且中 继站 cell-specific 天线端口数为 2, 此时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {1, 2} , 并在该配置集合中进一步配置回程 子帧接入链路 PDCCH为 1个符号。
实施例八、 中继站获取回程链路下行传输的起点位置为符号 3 , 并且中 继站 cell-specific 天线端口数为 2, 此时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 {1, 2} , 并在该配置集合中进一步配置回程 子帧接入链路 PDCCH为 2个符号。
实施例九、 中继站获取回程链路下行传输的起点位置为符号 3 , 并且此 时中继站 cell-specific天线端口数为 4, 此时， 中继站确定回程子帧接入链 路 PDCCH的符号数的配置集合为 {2} , 并在该配置集合中进一步配置回程 子帧接入链路 PDCCH为 2个符号。
上述的实施例只是作为本发明实施例中的优选方案， 在上述方案中都 是中继站在获取回程链路下行传输的起点位置后， 根据回程链路下行传输 的起点位置， 并且进一步根据定时场景类型和 /或 cell-specific天线端口数， 配置回程子帧接入链路 PDCCH符号数。
本发明实施例还提供了一种物理下行控制信道符号数量的配置装置， 如图 4所示， 该装置包括：
获取模块 201： 用于获取回程链路下行传输的起点位置；
配置模块 202: 用于根据起点位置， 确定回程子帧中接入链路 PDCCH 符号数的配置集合， 在所确定的配置集合中， 进行回程子帧中接入链路 PDCCH符号数量的配置， 其中， 接收的回程链路下行传输的起点位置， 不 晚于回程链路下行传输的起点位置。
进一步， 配置模块 202: 还用于根据起点位置， 确定回程子帧中接入链 路 PDCCH符号数的配置集合，回程子帧中接入链路 PDCCH符号数的配置 集合为第一集合、 第二集合或第三集合；
第一集合中，回程子帧接入链路 PDCCH能够被配置的符号数取值为 1; 第二集合中，回程子帧接入链路 PDCCH能够被配置的符号数取值为 2; 第三集合中， 回程子帧接入链路 PDCCH能够被配置的符号数取值为 1 或 2。
配置模块还包括第一配置子模块 2021 , 用于当回程链路传输的起点位 置为符号 1时，中继站确定回程子帧接入链路 PDCCH的符号数的配置集合 为第一集合；
配置模块还包括第二配置子模块 2022, 用于当回程链路传输的起点位 置为符号 2时，中继站确定回程子帧接入链路 PDCCH的符号数的配置集合 为第一集合或第二集合或第三集合；
配置模块还包括第三配置子模块 2023 , 用于当回程链路传输的起点位 置为符号 3时，中继站确定回程子帧接入链路 PDCCH的符号数的配置集合 为第二集合或第三集合；
配置模块还包括第四配置子模块 2024, 用于根据回程链路下行传输的 起点位置，以及定时场景类型和 /或小区级 cell-specific天线端口数来确定回 程子帧中接入链路 PDCCH符号数的配置集合。
进一步，配置模块 202:还用于当回程链路传输的起点位置为符号 1时， 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为第一集合。
进一步，配置模块 202:还用于当回程链路传输的起点位置为符号 2时， 中继站确定回程子帧接入链路 PDCCH 的符号数的配置集合为第一集合或 第二集合或第三集合。 进一步，配置模块 202:还用于当回程链路传输的起点位置为符号 3时， 中继站确定回程子帧接入链路 PDCCH 的符号数的配置集合为第二集合或 第三集合。
进一步， 配置模块 202: 还用于中继站定时场景类型和 /或 cell-specific 天线端口数确定回程子帧中接入链路 PDCCH符号数的配置集合，定时场景 类型为定时场景 1、 定时场景 3的子场景 A或定时场景 3的子场景 B; 在所述下行定时场景 1 中， 中继站下行接入链路的发射定时与基站的 下行发射定时异步， 并且中继站能够接收的回程链路下行传输的起点位置 为符号 k + 1 ;
在所述下行定时场景 3的子场景 A中， 中继站下行接入链路的发射定 时与基站的下行发射定时同步， 并且中继站能够接收的回程链路下行传输 的起点位置为符号 k + 1 ;
在所述下行定时场景 3的子场景 B中， 中继站下行接入链路的发射定 时与基站的下行发射定时同步， 并且中继站能够接收的回程链路下行传输 的起点位置为符号 k;
所述 k表示回程子帧上接入链路 PDCCH的符号数， 取值包括 1或 2。 进一步， 配置模块 202: 还用于当回程链路传输的起点位置为符号 1 , 并且当中继站 cell-specific (小区级）天线端口数为 1或 2, 并且中继站处于 下行定时场景 3的子场景 B时， 中继站确定回程子帧接入链路 PDCCH的 符号数的配置集合为第一集合。
进一步， 配置模块 202: 还用于当回程链路传输的起点位置为符号 2, 中继站 cell-specific天线端口数为 1或 2, 并且中继站处于下行定时场景 1 或下行定时场景 3的子场景 A时， 中继站确定回程子帧接入链路 PDCCH 的符号数的配置集合为第一集合。
进一步， 配置模块 202: 还用于当回程链路传输的起点位置为符号 2, 中继站 cell-specific天线端口数为 1或 2, 并且中继站处于下行定时场景 3 的子场景 B,中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 第三集合。
进一步， 配置模块 202: 还用于当回程链路传输的起点位置为符号 2, 中继站 cell-specific天线端口数大于等于 4,并且中继站处于下行定时场景 3 的子场景 B,中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为 第二集合。
进一步， 配置模块 202: 还用于当回程链路传输的起点位置为符号 3 , 中继站 cell-specific 天线端口数为 1 或 2, 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为第三集合。
进一步， 配置模块 202: 还用于当回程链路传输的起点位置为符号 3 , 中继站 cell-specific天线端口数大于等于 4, 中继站确定回程子帧接入链路 PDCCH的符号数的配置集合为第二集合。
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离 本发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权 利要求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在 内。

Claims

权利要求书
1、一种物理下行控制信道 PDCCH符号数量的配置方法，其特征在于， 该方法包括：
中继站获取回程链路下行传输的起点位置；
所述中继站根据所述起点位置，确定回程子帧中接入链路 PDCCH符号 数的配置集合；
所述中继站在所确定的配置集合中， 进行回程子帧中接入链路 PDCCH 符号数量的配置；
其中， 所述中继站接收的回程链路下行传输的起点位置， 不晚于回程 链路下行传输的起点位置。
2、 如权利要求 1所述的方法， 其特征在于， 所述回程子帧中接入链路 PDCCH符号数的配置集合为第一集合、 第二集合或第三集合；
所述第一集合中，回程子帧接入链路 PDCCH能够被配置的符号数取值 为 1 ;
所述第二集合中，回程子帧接入链路 PDCCH能够被配置的符号数取值 为 2;
所述第三集合中，回程子帧接入链路 PDCCH能够被配置的符号数取值 为 1或 2。
3、 如权利要求 2所述的方法， 其特征在于， 当回程链路传输的起点位 置为符号 1时，中继站确定回程子帧接入链路 PDCCH的符号数的配置集合 为第一集合。
4、 如权利要求 2所述的方法， 其特征在于， 当回程链路传输的起点位 置为符号 2时，中继站确定回程子帧接入链路 PDCCH的符号数的配置集合 为第一集合或第二集合或第三集合。
5、 如权利要求 2所述的方法， 其特征在于， 当回程链路传输的起点位 置为符号 3时，中继站确定回程子帧接入链路 PDCCH的符号数的配置集合 为第二集合或第三集合。
6、 如权利要求 2所述的方法， 其特征在于， 所述中继站根据所述起点 位置确定回程子帧中接入链路 PDCCH符号数的配置集合为：中继站根据回 程链路下行传输的起点位置，以及定时场景类型和 /或小区级 cell-specific天 线端口数确定回程子帧中接入链路 PDCCH符号数的配置集合。
7、 如权利要求 6所述的方法， 其特征在于， 所述定时场景类型为定时 场景 1、 定时场景 3的子场景 A或定时场景 3的子场景 B;
在所述下行定时场景 1 中， 中继站下行接入链路的发射定时与基站的 下行发射定时异步， 并且中继站能够接收的回程链路下行传输的起点位置 为符号 k + 1 ;
在所述下行定时场景 3的子场景 A中， 中继站下行接入链路的发射定 时与基站的下行发射定时同步， 并且中继站能够接收的回程链路下行传输 的起点位置为符号 k + 1 ;
在所述下行定时场景 3的子场景 B中， 中继站下行接入链路的发射定 时与基站的下行发射定时同步， 并且中继站能够接收的回程链路下行传输 的起点位置为符号 k;
所述 k表示回程子帧上接入链路 PDCCH的符号数， 取值包括 1或 2。
8、 如权利要求 7所述的方法， 其特征在于， 当回程链路传输的起点位 置为符号 1 , 中继站 cell-specific天线端口数为 1或 2,并且中继站处于下行 定时场景 3的子场景 B时， 中继站确定回程子帧接入链路 PDCCH的符号 数的配置集合为第一集合。
9、 如权利要求 7所述的方法， 其特征在于， 当回程链路传输的起点位 置为符号 2, 中继站 cell-specific天线端口数为 1或 2,并且中继站处于下行 定时场景 1或下行定时场景 3的子场景 A时， 中继站确定回程子帧接入链 路 PDCCH的符号数的配置集合为第一集合。
10、 如权利要求 7所述的方法， 其特征在于， 当回程链路传输的起点 位置为符号 2, 中继站 cell-specific天线端口数为 1或 2,并且中继站处于下 行定时场景 3的子场景 B时， 中继站确定回程子帧接入链路 PDCCH的符 号数的配置集合为第三集合。
11、 如权利要求 7所述的方法， 其特征在于， 当回程链路传输的起点 位置为符号 2, 中继站 cell-specific天线端口数大于等于 4,并且中继站处于 下行定时场景 3的子场景 B时， 中继站确定回程子帧接入链路 PDCCH的 符号数的配置集合为第二集合。
12、 如权利要求 7所述的方法， 其特征在于， 当回程链路传输的起点 位置为符号 3 , 中继站 cell-specific天线端口数为 1或 2, 中继站确定回程子 帧接入链路 PDCCH的符号数的配置集合为第三集合。
13、 如权利要求 7所述的方法， 其特征在于， 当回程链路传输的起点 位置为符号 3 , 中继站 cell-specific天线端口数大于等于 4, 中继站确定回程 子帧接入链路 PDCCH的符号数的配置集合为第二集合。
14、一种物理下行控制信道 PDCCH符号数量的配置装置，其特征在于， 该装置包括： 获耳 4莫块、 配置模块； 其中，
获取模块， 用于获取回程链路下行传输的起点位置；
配置模块， 用于根据所述起点位置， 确定回程子帧中接入链路 PDCCH 符号数的配置集合， 在所确定的配置集合中， 进行回程子帧中接入链路 PDCCH符号数量的配置， 其中， 接收的回程链路下行传输的起点位置， 不 晚于回程链路下行传输的起点位置。
15、 如权利要求 14所述的装置， 其特征在于， 所述配置模块， 还用于 根据所述起点位置， 确定回程子帧中接入链路 PDCCH符号数的配置集合， 回程子帧中接入链路 PDCCH符号数的配置集合为第一集合、第二集合或第 第一集合中，回程子帧接入链路 PDCCH能够被配置的符号数取值为 1 ; 第二集合中，回程子帧接入链路 PDCCH能够被配置的符号数取值为 2; 第三集合中， 回程子帧接入链路 PDCCH能够被配置的符号数取值为 1 或 2。
16、 如权利要求 15所述的装置， 其特征在于， 配置模块进一步包括： 第一配置子模块， 用于当回程链路传输的起点位置为符号 1 时， 中继 站确定回程子帧接入链路 PDCCH的符号数的配置集合为第一集合；
第二配置子模块， 用于当回程链路传输的起点位置为符号 2 时， 中继 站确定回程子帧接入链路 PDCCH 的符号数的配置集合为第一集合或第二 集合或第三集合；
第三配置子模块， 用于当回程链路传输的起点位置为符号 3 时， 中继 站确定回程子帧接入链路 PDCCH 的符号数的配置集合为第二集合或第三 第四配置子模块， 用于根据回程链路下行传输的起点位置， 以及定时 场景类型和 /或小区级 cell-specific 天线端口数来确定回程子帧中接入链路 PDCCH符号数的配置集合。
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