WO2010097017A1 - 无线通信系统及用于其中的数据传输方法 - Google Patents

无线通信系统及用于其中的数据传输方法 Download PDF

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Publication number
WO2010097017A1
WO2010097017A1 PCT/CN2010/070356 CN2010070356W WO2010097017A1 WO 2010097017 A1 WO2010097017 A1 WO 2010097017A1 CN 2010070356 W CN2010070356 W CN 2010070356W WO 2010097017 A1 WO2010097017 A1 WO 2010097017A1
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WO
WIPO (PCT)
Prior art keywords
signal
station
base station
response
mobile station
Prior art date
Application number
PCT/CN2010/070356
Other languages
English (en)
French (fr)
Inventor
张元涛
王键
周华
田军
Original Assignee
富士通株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 富士通株式会社 filed Critical 富士通株式会社
Priority to EP10745801.0A priority Critical patent/EP2403274A4/en
Priority to JP2011551397A priority patent/JP5673559B2/ja
Publication of WO2010097017A1 publication Critical patent/WO2010097017A1/zh
Priority to US13/217,910 priority patent/US20120008545A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1692—Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays
    • 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 wireless communications, and in particular, to a wireless communication system and a data transmission method therefor.
  • the wireless system uses a relay device to forward wireless communication signals between the two parties to improve system throughput and user data rate.
  • FIG. 1 shows a typical uplink data transmission process using a transparent relay.
  • the mobile station (MS) 130 transmits data upward.
  • the relay station (RS) 120 receives and stores data.
  • the base station (BS) 110 determines that data needs to be retransmitted, the relay station 120 and the mobile station 130 simultaneously retransmit the data to the base station, and the base station 110 receives the combined decoding.
  • Figure 2 shows the detailed transmission and reception timing of the above process. As shown in Fig. 2, the mobile station transmits data to the relay station and the base station, and the relay station stores the received data.
  • the relay station and the mobile station then simultaneously receive the decoding response signal ACK/NACK from the base station, where ACK indicates that the base station decodes correctly and NACK indicates the base station decode error. If the received decoding response signal is ACK, the mobile station may send new data to the base station at the next moment; if the received decoding response signal is NACK, then at the next moment, the mobile station and the relay station simultaneously simultaneously with a certain time-frequency resource The retransmission signal is sent to the base station, and the base station receives and combines the two retransmission signals.
  • the relay station and the mobile station simultaneously transmit retransmission data to the base station. Since the channel condition of the relay station to the base station is usually much better than the channel condition of the mobile station to the base station, the relay station combines and decodes the retransmission data. The contribution is greater than the contribution of the mobile station to the combined decoding of the retransmitted data.
  • the relay station and the mobile station need to use the same code modulation method when retransmitting data.
  • the channel condition of the relay station to the base station is usually much better than the channel condition of the mobile station to the base station, using the same code modulation method will bring a certain waste of resources.
  • the present invention proposes a wireless communication system and a data transmission method therefor for solving one or more problems existing in a conventional uplink data retransmission method.
  • a data transmission method for a wireless communication system comprising a base station, a mobile station, and a relay station transparent to the mobile station, the method comprising: Receiving, by the base station, a first signal sent from the mobile station, decoding the first signal, and sending a response indicating that the decoding is incorrect to the relay station when the decoded result is incorrect, A response is sent to the mobile station indicating that the decoding is incorrect.
  • a base station for use in a wireless communication system.
  • the base station includes: a receiving module, configured to receive a signal from a mobile station or a relay station in the wireless communication system; and a decoding module, configured to receive, at the receiving module, a first signal sent from the mobile station or Decoding a received signal from the second signal sent by the relay station; a determining module, configured to determine whether the decoding result of the decoding module is correct; and a response feedback module, configured to move to the relay station or a feedback response, wherein, when the determining module determines that the decoding result of the decoding module is incorrect, the response feedback module sends a response indicating that the decoding is incorrect to the relay station, and does not The mobile station sends a response indicating that the decoding is incorrect.
  • a wireless communication system comprising the base station as described above, and further comprising a mobile station and the a mobile station transparent relay station, wherein the mobile station includes a transmitting module for transmitting a first signal to an uplink; the relay station includes a first signal for receiving or transmitting from the mobile station And a relay receiving module for transmitting the request, a storage module for saving the first signal, and a relay for transmitting a second signal generated based on the first signal to the base station in response to the received retransmission request Transmitter module.
  • the base station transmits an actual decoding response NACK to the relay station without transmitting a NACK to the mobile station when the result of decoding the data received from the mobile station is erroneous.
  • the response sent by the base station to the mobile station is the decoding correct response ACK
  • the response sent to the relay station is the actual decoding response ACK or NACK according to the decoding result.
  • the relay station transmits a retransmission signal to the base station, and the mobile station can remain silent to save transmission power and time-frequency resources.
  • the coded modulation mode of the retransmission data of the relay station may use the same code modulation mode as the data transmitted by the mobile station for the first time, or may be adaptively adjusted according to the channel quality of the relay station to the base station or use a predetermined code modulation mode to Save resources used to send retransmitted data.
  • FIG. 1 is a schematic diagram showing a conventional transparent relay uplink data transmission
  • FIG. 2 is a schematic diagram showing timings of transmission and reception of conventional transparent relay uplink data and response signals when data retransmission is required;
  • FIG. 3 is a schematic diagram showing transparent relay data transmission in a wireless communication system according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of transmission and reception timing of transparent relay data and response signals according to an embodiment of the present invention when data retransmission is required;
  • FIG. 5 is a block diagram showing an exemplary structure of a base station according to an embodiment of the present invention.
  • FIG. 6 is a flow chart showing an example of data processing performed by a base station according to an embodiment of the present invention.
  • Figure 7 is a block diagram showing an exemplary structure of a relay station according to an embodiment of the present invention.
  • Figure 8 is a flow chart showing an example of data processing by a relay station in accordance with one embodiment of the present invention.
  • FIG. 9 is a flow chart showing the data processing performed by the mobile station served by the relay station shown in FIG. 7;
  • Figure 10 illustrates the modulation of a decoded response signal in accordance with one embodiment of the present invention.
  • the wireless communication system 300 includes a base station.
  • the relay station 320 is transparent to the mobile station 330.
  • the first signal is transmitted when the data is transmitted for the first time, for example, in the first time slot.
  • Base station 310 receives the first signal from mobile station 330 and decodes the received first signal.
  • the base station 310 transmits a response NACK or a retransmission request to the relay station 320 indicating that the decoding is incorrect. In other words, the response NACK or retransmission request for indicating that the decoding is incorrect is not sent to the mobile station 330.
  • Relay station 320 also receives the first signal from mobile station 330 and stores the first signal. When data retransmission is required, the relay station 320 retransmits the data to the base station 310, and the mobile station 330 does not have to retransmit the data.
  • base station 310 when base station 310 determines that data needs to be retransmitted, base station 310 can also send a response ACK to mobile station 330 indicating that the decoding was correct.
  • base station 310 can feed back a response ACK to mobile station 330 upon receiving data transmitted from mobile station 330, regardless of subsequent decoding results.
  • the base station 310 may feed back to the relay station 320 and the mobile station 330 a response ACK indicating that the decoding is correct.
  • relay station 320 may transmit the stored first signal from the mobile station directly to base station 310, ie, retransmitted by relay station 320.
  • the signal may be the first signal it receives from mobile station 330.
  • the relay station 320 may further extract data to be retransmitted from the first signal, re-encode and modulate the extracted data to generate a second signal, and then transmit the second signal to the base station 310.
  • the second signal may employ an encoding and modulation scheme adaptively selected according to the channel condition between the relay station 320 and the base station 310, and may also employ a pre-agreed encoding and modulation scheme between the relay station 320 and the base station 310.
  • the relay station 320 can retransmit the data using a different encoding and modulation scheme than the first signal. To save resources used by retransmissions.
  • FIG. 4 shows the transmission and reception timing of the above process.
  • the mobile station for example The data is sent up the line in the first time slot.
  • the relay station saves the received data.
  • the base station encodes the received data.
  • the base station transmits a decoding response NACK to the relay station without feeding back the decoding response NACK to the mobile station.
  • the base station may further send, to the mobile station, a decoding response ACK indicating that the decoding result is correct when the decoding result indicates that the data is incorrect.
  • the relay station retransmits the data to the base station, and the mobile station does not perform data retransmission.
  • Figure 5 is a schematic representation of the structure of an exemplary base station in accordance with one embodiment of the present invention.
  • Fig. 6 is a flow chart schematically showing the data processing performed by the base station shown in Fig. 5.
  • the base station 510 includes a receiving module 512, a decoding module 514, a determining module 516, and a response feedback module 518.
  • Receive module 512 is for receiving data from a mobile station or a relay station.
  • Decoding module 514 is operative to decode the received data.
  • the response feedback module 518 is configured to deblock the decoding response ACK/NACK to the mobile station or relay station.
  • the determining module 516 is configured to determine whether the decoded result of the decoding module 514 is correct, and control the response feedback module 518 according to the result of the determination.
  • the response feedback module 518 sends a response NACK RS indicating that the decoding is incorrect to the relay station, and does not feed back to the mobile station for indicating that the decoding is incorrect. The response, so that the relay station retransmits the data, and the mobile station does not retransmit the data.
  • the response feedback module 518 may send a response ACK MS to the mobile station to indicate that the decoding is correct, to further ensure that the mobile station does not perform data retransmission.
  • the response feedback module 518 can include the response NACK RS and the ACKMS in the same decoding response signal.
  • the response feedback module 518 may further modulate the decoding response signal before transmitting the decoding response signal, and the modulation mode is described in detail below.
  • the response feedback module 518 can also send the response NACK RS , ACK MS as separate signals to the relay station and the mobile station, respectively, in which case the responses can be multiplexed for transmission.
  • the multiplexing mode is, for example, CDM, TDM or FDM, etc.
  • the multiplexing modes listed herein are merely exemplary, and other suitable methods may be used by those skilled in the art.
  • the response feedback module 518 can send a response ACK indicating that the decoding is correct to the mobile station and/or the relay station when the decoding result is correct.
  • the response feedback module 518 can include the response ACK fed back to the mobile station and the relay station in the same decoding. In the response signal, the ACK that is fed back to the relay station and the mobile station can also be transmitted as a separate signal.
  • step 601 data from the mobile station is received by the receiving module of the base station, and the decoding module of the base station decodes the received data.
  • step 603 the determining module of the base station determines whether the decoded result is correct; if the decoding result is wrong, then proceeds to step 607, otherwise step 605 is performed.
  • the response feedback module of the base station transmits a response ACK RS , ACK MS indicating that the decoding is correct to the relay station and/or the mobile station, and ends the data transmission.
  • the response ACK RS , ACK MS may be included in the same decoding response signal.
  • the response ACK RS and the ACK MS may also be separately sent to the relay station and the mobile station as separate signals.
  • the method flow may not include step 605. In other words, if the decoding result is correct, the base station can end the data transmission without transmitting a response.
  • the response feedback module of the base station sends a response NACK RS indicating the decoding Wu to the relay station.
  • the mobile station may also send a response ACK MS to the mobile station indicating that the decoding is correct.
  • the response NACK RS and the ACK MS may be included in the same decoding response signal.
  • the decoding response signal may also be modulated before transmitting the decoding response signal, the modulation mode of which is described in detail below.
  • the base station sends a response NACK RS to the relay station and the mobile station,
  • the ACKMS can also be sent separately to the relay station and the mobile station as separate signals, in which case the responses can be multiplexed for transmission.
  • the multiplexing method is, for example, CDM (Code Division Multiplexing), TDM (Time Division Multiplexing), or FDM (Frequency Division Multiplexing), etc., of course, the manner of multiplexing enumerated herein is merely exemplary, and is common in the art. Technicians can use other appropriate methods.
  • step 609 the base station receives the retransmission data from the relay station, and combines the decoded data.
  • the base station determines whether the decoding result is correct. If the decoding result is correct, the process proceeds to step 617. Otherwise, the process proceeds to step 613.
  • step 617 the base station sends a response signal indicating that the decoding is correct to the relay station.
  • ACKRS acknowledgement Signal
  • step 613 the base station determines whether the number of retransmissions that have been performed has reached a preset maximum number of retransmissions, and if so, ends the data transmission, otherwise proceeds to step 615.
  • This step 613 is optional.
  • the judgment of the number of retransmissions can also be performed by the relay station.
  • step 615 the base station transmits a retransmission request or a response NACK RS for indicating a decoding error to the relay station, and returns to step 609.
  • the response or the retransmission request for indicating a decoding error (incorrect) is sent by the base station when data retransmission is required, and both functions as receiving nodes.
  • the data is retransmitted (e.g., relay), so the two terms are used interchangeably in this context.
  • the above embodiments are illustrative and not restrictive, as will be understood by those of ordinary skill in the art.
  • the method according to an embodiment of the present invention may not be performed in the order of the steps described above. For example, when the base station determines that the decoding result is wrong, the base station may first feed back the response NACK RS to the relay station, and then perform the judgment on the number of retransmissions. For another example, when the base station determines that the decoding result is correct, the base station may not feed back the response ACK RS to the relay station.
  • the above methods may employ other sequences or insert one or more other steps, or may choose not to perform one or more of them. The necessary steps.
  • Figure 7 is a schematic illustration of the structure of an exemplary relay station in accordance with one embodiment of the present invention.
  • the relay station 720 includes a relay receiving module 722, a storage module 724, and a relay transmitting module 726.
  • the relay receiving module 722 is configured to receive data transmitted from the mobile station.
  • a storage module 724 is used to store the received data from the mobile station.
  • the receiving module 722 is further configured to receive a response fed back from the base station.
  • the relay transmitting module 726 retransmits the data of the storage module 724 to the base station.
  • the storage module 724 can clear its stored data when the receiving module 722 receives a response from the base station indicating that the decoding result is correct. Optionally, the storage module 724 can be cleared when the receiving module 722 does not receive a response from the base station within a predetermined time. Its stored data.
  • relay station 720 can also include a coded modulation module 728.
  • the coded modulation module 728 is for re-encoding and modulating the data to be retransmitted and transmitting the encoded and modulated data to the relay transmit module 726.
  • Relay transmit module 726 can retransmit the data encoded and modulated by coded modulation module 728.
  • the code modulation module 728 can encode and modulate the data to be retransmitted using any of the following coding and modulation methods: the same coding and modulation method as the mobile station transmits data, according to the relay station A coding and modulation scheme or a predetermined coding and modulation scheme that is adaptively selected with respect to channel conditions between base stations.
  • the relay transmitting module 726 can use the time-frequency resource used by the mobile station to transmit data to the base station when retransmitting data.
  • time-frequency resources can also be used.
  • the relay transmitting module 726 can retransmit the data by using a synchronous retransmission mode or an asynchronous retransmission mode.
  • Fig. 8 is a view schematically showing an example of the flow of data processing performed by the relay station shown in Fig. 7.
  • the relay station receives and stores data from the mobile station.
  • the relay station receives a decoding response from the base station.
  • the relay station determines whether the decoding response is an ACK indicating that the decoding result is correct. If the received response is ACK, then go to step 807, otherwise go to 809.
  • step 807 the memory module of the relay station releases the previously saved data and ends the data retransmission.
  • the relay station may also release the previously saved data and end the data retransmission.
  • step 809 the relay station determines whether the number of retransmissions that have been performed has reached the maximum number of retransmissions, and if so, ends the data retransmission, otherwise proceeds to step 811.
  • the judgment of the number of retransmissions can also be performed by the base station.
  • the processing flow of the relay station may not include step 809.
  • the relay station processes the data to be retransmitted and performs retransmission.
  • the relay station may directly transmit the stored data from the mobile station to the base station, and may re-encode and modulate the retransmitted data.
  • the data to be retransmitted may be encoded and modulated using any of the following encoding and modulation methods: the same encoding and modulation method as the mobile station transmits data, and the signal according to the relay station and the base station [61]
  • the relay station can use the time-frequency resources used by the mobile station to transmit data to the base station to save resources when retransmitting data. Of course, other time-frequency resources can also be used according to actual needs.
  • the relay station may retransmit the data according to actual needs by using a synchronous retransmission mode or an asynchronous retransmission mode.
  • step 901 the mobile station transmits data to the relay station and the base station.
  • step 903 the mobile station receives a decoding response signal ACK MS from the base station.
  • step 905 the mobile station determines if there is a new scheduling instruction, and if so, proceeds to step 901.
  • FIG. 10 respectively show an example of decoding a response signal when a base station includes a response fed back to a mobile station and a relay station in different decoding response signals and the same decoding response signal, respectively.
  • the base station includes the responses fed back to the mobile station and the relay station in different decoding response signals, and respectively transmits the decoding response signals of the corresponding mobile station and the relay station with different resources.
  • Both decoding response signals are BPSK modulated, that is, the ACK is mapped to +1 and the NACK is mapped to -1.
  • the base station includes the response fed back to the mobile station and the relay station in the same decoding response signal, and transmits the decoding response signal corresponding to the mobile station and the relay station by using the same resource.
  • mapping NACK MS to -1 will map (NACK RS , ACK MS ) to (l+i)/sqrt(2), or (ACK RS , ACK MS ) to (li)/sqrt(2) .
  • sqrt(2) represents the square root of 2.
  • mapping manners shown herein are merely exemplary, and other mapping methods according to this rule may also be used.
  • the scheme according to an embodiment of the present invention can be applied to, for example, a TDD (Time Division Duplex) and FDD (Frequency Division Duplex) system.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • All or any of the steps or components of the method and apparatus of the present invention may be in a network of any computing device (including a processor, storage medium, etc.) or computing device.
  • Hardware, firmware, software, or a combination thereof is implemented, which can be implemented by those of ordinary skill in the art using their basic programming skills while reading the description of the present invention, and thus detailed description is omitted here.
  • the object of the present invention can also be achieved by running a program or a group of programs on any information processing device.
  • the information processing device may be a well-known general purpose device.
  • the object of the present invention can also be achieved by merely providing a program product comprising program code for implementing the method or apparatus. That is to say, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention.
  • the storage medium may be any known storage medium or any storage medium developed in the future, and thus it is not necessary to enumerate various storage media here.

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

Description

无线通信系统及用于其中的数据传输方法
技术领域
[01] 本发明涉及无线通信领域， 具体涉及一种无线通信系统以及其 中的数据传输方法。
背景技术
[02] 随着无线多媒体业务的快速发展， 用户对数据通信能力以及传 输质量的要求越来越高。 然而， 由于复杂无线环境中阻挡、 阴影等因 素的影响， 形成了许多通信死角。 这些将使用户难以获得持续的高速 率和高质量的通信服务。 为了解决这一问题， 无线系统釆用中继设备 对无线通信双方之间的无线通信信号进行转发以提高系统吞吐量和 用户数据速率.
[03] 按照移动台是否知道中继的存在， 可以将中继分为透明中继和 非透明中继。 图 1示出了典型的釆用透明中继的上行数据传输过程。 如图 1所示，在第一次传输数据时，移动台 (MS)130向上行发送数据。 中继站 (RS)120接收并存储数据。 当基站（BS ) 110确定需要重传数 据时， 中继站 120和移动台 130同时将数据重传给基站， 基站 110接 收后进行合并译码。 图 2示出了上述过程的详细收发时序。 如图 2所 示， 移动台将数据发送给中继站和基站， 中继站保存所接收的数据。 中继站和移动台在随后同时接收来自基站的译码响应信号 ACK/NACK, 其中 ACK表示基站译码正确， NACK表示基站译码 错误。 如果所接收的译码响应信号为 ACK, 则移动台可以在下一时 刻向基站发送新数据； 如果所接收的译码响应信号为 NACK, 则在下 一时刻， 移动台和中继站在某一时频资源同时向基站发送重传信号， 基站接收合并合并这两路重传信号。
[04] 在上述的上行数据重传方法中， 当需要数据重传时， 中继站和 移动台同时向基站发送重传数据。 由于中继站到基站的信道状况通常 远好于移动台到基站的信道状况，所以中继站对重传数据合并解码的 贡献大于移动台对重传数据合并解码的贡献。
[05] 另外， 中继站和移动台在重传数据时需要釆用相同的编码调制 方式。 然而， 由于中继站到基站的信道状况通常远好于移动台到基站 的信道状况， 所以釆用相同的编码调制方式会带来一定的资源浪费。
[06] 应该注意， 上面对常规技术的说明只是为了方便对本发明的技 术方案进行清楚、 完整的说明， 并方便本领域技术人员的理解而阐述 的。不能仅仅因为这些方案在本发明的背景技术部分进行了阐述而认 为上述技术方案为本领域技术人员所公知。
发明内容
[07] 本发明提出了一种无线通信系统以及其中的数据传输方法， 用于解决常规上行链路数据重传方法中存在的一个或多个问 题。
[08] 根据本发明的一个方面， 提供了一种用于无线通信系统中的数 据传输方法， 所述无线通信系统包括基站、 移动台以及对所述移动台 透明的中继站， 所述方法包括： 所述基站接收从所述移动台发送的第 一信号， 对所述第一信号进行译码， 并在译码的结果不正确时， 向所 述中继站发送用于指示译码不正确的响应， 而不向所述移动台发送用 于指示译码不正确的响应。
[09] 根据本发明的另一个方面， 提供了一种于用于无线通信系统中 的基站。 所述基站包括： 接收模块， 用于接收来自所述无线通信系统 中的移动台或中继站的信号； 译码模块， 用于在所述接收模块接收到 从所述移动台发送的第一信号或从所述中继站发送的第二信号时对 所接收的信号进行译码； 判断模块， 用于判断所述译码模块译码的结 果是否正确；及响应反馈模块，用于向所述中继站或移动台反馈响应， 其中， 在所述判断模块判断出所述译码模块译码的结果不正确时， 所 述响应反馈模块向所述中继站发送用于指示译码不正确的响应， 而不 向所述移动台发送用于指示译码不正确的响应。
[10] 根据本发明的另一个方面， 还提供了一种无线通信系统， 所述 无线通信系统包括如上所述的基站， 另外， 还包括移动台以及对所述 移动台透明的中继站， 其中， 所述移动台包括用于向上行发送第一信 号的发射模块； 所述中继站包括用于接收从所述移动台发送的第一信 号或者从所述基站发送的重传请求的中继接收模块、用于保存所述第 一信号的存储模块以及用于响应于所接收到的重传请求而向基站发 送基于所述第一信号而生成的第二信号的中继发射模块。
[11] 在本发明的实施例中， 基站在对从移动台接收的数据的译码的 结果错误时， 向中继站发送实际的译码响应 NACK, 而不向移动台发 送 NACK。 具体而言， 无论基站的译码结果是否正确， 基站向移动台 发送的响应均为译码正确响应 ACK, 而发送给中继站的响应则是根 据译码结果的实际译码响应 ACK或 NACK。 釆用此种方式， 当需要 数据重传时， 由中继站向基站发送重传信号， 而移动台可以保持沉默 以节省发送功率和时频资源。 中继站的重传数据的编码调制方式可以 釆用与移动台第一次发送的数据相同的编码调制方式，也可以根据中 继站到基站的信道质量进行自适应调整或者釆用预定的编码调制方 式， 以节省发送重传数据所占用的资源。
[12] 参照以下的说明和附图， 本发明的这些和进一步的方面和特征 将变得更加清楚。 在所述的说明和附图中， 详细公开了本发明的特定 实施方式， 指明了本发明的原理可以被釆用的方式。 应该理解， 本发 明在范围上并不因而受到限制。在所附权利要求的精神和条款的范围 内， 本发明包括许多改变、 修改和等同。
[13] 针对一种实施方式描述和 /或示出的特征可以以相同或类似 的方式在一个或更多个其它实施方式中使用，与其它实施方式中的特 征相组合， 或替代其它实施方式中的特征。
[14] 应该强调， 术语 "包括 /包含" 在本文使用时指特征、 整件、 步骤或组件的存在， 但并不排除一个或更多个其它特征、 整件、 步骤 或组件的存在或附加。
[15] 参照以下的附图可以更好地理解本发明的很多方面。 附图中的 部件不是成比例绘制的， 而只是为了示出本发明的原理。 为了便于示 出和描述本发明的一些部分， 附图中对应部分可能 文大， 即， 使其 相对于在根据本发明实际制造的示例性装置中的其它部件变得更大。 在本发明的一个附图或一种实施方式中描述的元素和特征可以与一 个或更多个其它附图或实施方式中示出的元素和特征相结合。 此外， 在附图中， 类似的标号表示几个附图中对应的部件， 并可用于指示多 于一种实施方式中使用的对应部件。
附图说明
[16] 附图示出了本发明的优选实施例， 构成了说明书的一部分， 用 于与文字说明一起进一步详细地阐释本发明的原理。 其中：
[17] 图 1是示出常规的透明中继上行数据传输的示意图；
[18] 图 2是示出当需要数据重传时常规的透明中继上行数据及响应 信号的收发时序的示意图；
[19] 图 3示出了在根据本发明一个实施例的无线通信系统中进行透 明中继数据传输的示意图；
[20] 图 4是当需要数据重传时根据本发明一个实施例的透明中继数 据和响应信号的收发时序的示意图；
[21] 图 5是示出了根据本发明一个实施例的基站的示例性结构的框 图；
[22] 图 6是示出了根据本发明一个实施例基站进行数据处理的一个 示例的流程图；
[23] 图 7示出了才艮据本发明一个实施例的中继站的示例性结构的框 图；
[24] 图 8示出了根据本发明一个实施例中继站进行数据处理的一个 示例的流程图；
[25] 图 9示出了图 7所示的中继站所服务的移动台进行数据处理的 流程图； 以及
[26] 图 10 示出了根据本发明的一个实施例的译码响应信号的调制 方式。
具体实施方式 [27] 图 3示出了在根据本发明一个实施例的无线通信系统中进行透 明中继数据传输的示意图。 如图 3所示， 无线通信系统 300包括基站
( BS ) 310、 中继站（RS ) 320以及移动台 （MS ) 330。 中继站 320 对于移动台 330,是透明的。、在第一次传输数据^例如在第 时隙）时、， 第一信号。基站 310接收来自移动台 330的第一信号并对所接收的第 一信号进行译码。 当基站 310确定需要重传数据时， 基站 310向中继 站 320发送用于指示译码不正确的响应 NACK或者重传请求。 换言 之， 用于指示译码不正确的响应 NACK或者重传请求不发给移动台 330。
[28] 中继站 320也接收来自移动台 330的第一信号并存储该第一信 号。 当需要数据重传时， 由中继站 320向基站 310重传数据， 而移动 台 330则不必重传数据。
[29] 在一个示例中， 当基站 310确定需要重传数据时， 基站 310还 可以向移动台 330发送用于指示译码正确的响应 ACK。
[30] 在一个示例中， 基站 310可以在接收到从移动台 330发送的数 据时即向移动台 330反馈响应 ACK, 而不管后续的译码结果如何。
[31] 可选地， 当译码结果正确时， 基站 310可以向中继站 320和移 动台 330反馈用于指示译码正确的响应 ACK。
[32] 在一个示例中，当接收到来自基站 310的响应 NACK或者重传 请求时， 中继站 320可以将所存储的来自移动台的第一信号直接发送 给基站 310， 即中继站 320所重传的信号可以是其从移动台 330接收 的第一信号。 可选地， 中继站 320还可以从第一信号中提取要重传的 数据， 对所提取的数据重新进行编码和调制从而生成第二信号， 然后 将第二信号发送给基站 310。这里，第二信号可以釆用根据中继站 320 与基站 310之间的信道状况而自适应选择的编码和调制方式，也可以 釆用在中继站 320与基站 310之间预先约定的编码和调制方式。换言 之， 中继站 320可以釆用与第一信号不同的编码和调制方式来重传数 据。 以节省重传所占用的资源。
[33] 图 4示出了上述过程的收发时序。 如图 4所示， 移动台 （例如 在第一个时隙）向上行发送数据。 中继站保存所接收的数据。 基站对 所接收的数据进 码。 当译码结果指示数据 吴时， 基站向中继站 发送译码响应 NACK, 而不向移动台反馈译码响应 NACK。 可选地， 基站还可以在译码结果指示数据错误时向移动台发送用于指示译码 结果正确的译码响应 ACK。 随后， 中继站向基站重传数据， 而移动 台不执行数据重传。
[34] 图 5示意性地给出了根据本发明一个实施例的示例性基站的结 构。 图 6示意性地给出图 5所示的基站进行数据处理的流程图。
[35] 如图 5所示， 基站 510包括接收模块 512、译码模块 514、 判断 模块 516以及响应反馈模块 518。 接收模块 512用于接收来自移动台 或中继站的数据。 译码模块 514用于所接收的数据进行译码。 响应反 馈模块 518用于向移动台或中继站反锁译码响应 ACK/NACK。 判断 模块 516用于判断译码模块 514译码的结果是否正确，并根据判断结 果来控制响应反馈模块 518。
[36] 当译码结果错误时， 在判断模块 516的控制下， 响应反馈模块 518向中继站发送用于指示译码不正确的响应 NACKRS， 而不向移动 台反馈用于指示译码不正确的响应， 从而使中继站重传数据， 而移动 台不重传数据。
[37] 可选地， 当译码结果错误时， 响应反馈模块 518可以向移动台 发送用于指示译码正确的响应 ACKMS， 以进一步保证移动台不进行 数据重传。 可选地， 响应反馈模块 518可以将响应 NACKRS、 ACKMS 包括在同一个译码响应信号中。 可选地， 在发送所述译码响应信号之 前， 响应反馈模块 518还可以对所述译码响应信号进行调制， 调制方 式在下文中详细说明。 在另一示例中， 响应反馈模块 518还可以将响 应 NACKRS、 ACKMS作为分离的信号分别发送给中继站和移动台， 在这种情况下这些响应可以被复用发送。 复用的方式例如为 CDM、 TDM或 FDM等， 当然， 此处列举的复用的方式仅为示例性的， 本 领域的普通技术人员可以釆用其他适当的方式。
[38] 可选地，响应反馈模块 518可以在译码结果正确时向移动台和 / 或中继站发送用于指示译码正确的响应 ACK。 可选地， 响应反馈模 块 518可以将反馈给移动台和中继站的响应 ACK包括在同一个译码 响应信号中， 也可以反馈给中继站和移动台的 ACK作为分离的信号 来发送。
[39] 下文参考图 6来描述图 5所示的基站进行数据处理的流程的一 个示例。
[40] 如图 6所示， 在步骤 601， 由基站的接收模块接收来自移动台 的数据，并且基站的译码模块对所接收的数据进行译码。在步骤 603， 基站的判断模块判断译码的结果是否正确； 如果译码结果错误， 则转 向步骤 607， 否则执行步骤 605。在步骤 605， 基站的响应反馈模块向 中继站和 /或移动台发送用于指示译码正确的响应 ACKRS、 ACKMS， 并结束数据传输。 所述响应 ACKRS、 ACKMS可以包括在同一个译码 响应信号中。 可选地， 所述响应 ACKRS、 ACKMS还可以作为分离的 信号被分别发送给中继站和移动台。 另外， 所述方法流程可以不包括 步骤 605。 换言之， 如果译码结果正确， 基站可以结束数据传输而不 发送响应。
[41] 在步骤 607， 基站的响应反馈模块向中继站发送用于指示译码 吴的响应 NACKRS。 可选地， 移动台还可以向移动台发送用于指示 译码正确的响应 ACKMS。 在基站分别向中继站和移动台发送 NACKRS、 ACKMS的情况下， 所述响应 NACKRS、 ACKMS可以包括 在同一个译码响应信号中。 可选地， 在发送所述译码响应信号之前， 所述译码响应信号还可以被调制， 其调制方式在下文中详细说明。
[42] 在另一示例中， 基站发送给中继站和移动台的响应 NACKRS、
ACKMS还可以作为分离的信号被分别发送给中继站和移动台， 在这 种情况下所述响应可以被复用发送。 复用的方式例如为 CDM (码分 复用）、 TDM (时分复用）或 FDM (频分复用）等， 当然， 此处列 举的复用的方式仅为示例性的，本领域的普通技术人员可以釆用其他 适当的方式。
[43] 在步骤 609， 基站接收来自中继站的重传数据， 合并后译码。 在步骤 611， 基站判断译码结果是否正确， 如果译码结果正确， 则转 向步骤 617， 否则， 则转向步骤 613。
[44] 在步骤 617， 基站向中继站发送用于指示译码正确的响应信号 ACKRS, 并结束数据传输。
[45] 在步骤 613， 基站判断已执行过的重传次数是否达到了预设的 最大重传次数， 如果已达到， 则结束数据传输， 否则转向步骤 615。 该步骤 613是可选的。 另外， 如下文所述， 对重传次数的判断也可以 由中继站来执行。
[46] 在步骤 615， 基站向中继站发送重传请求或者用于指示译码错 误的响应 NACKRS， 并返回步骤 609。
[47] 在上述实施例中， 所述用于指示译码错误（不正确） 的响应或 者重传请求都是由基站在需要数据重传时发送的，二者的作用都是使 其接收节点（例如中继站）重传数据， 因此， 在本上下文中这两个术 语可以互换使用。
[48] 如本领域的普通技术人员可以理解的， 上述实施例是示例性 的， 而非限制性的。 根据本发明实施例的方法可以不按照上述的步骤 顺序执行。 例如， 基站在判断出译码结果错误时可以首先向中继站反 馈响应 NACKRS， 然后再执行对重传次数的判断。 又如， 基站在判断 出译码结果正确时可以不向中继站反馈响应 ACKRS。 如本领域的普 通技术人员可以理解的， 在能够实现本发明的原理的前提下， 上述方 法可以釆用其他顺序或插入一个或多个其他步骤，也可以选择不执行 其中的一个或多个不必要的步骤。
[49] 图 7示意性给出了根据本发明一个实施例的示例性中继站的结 构。
[50] 如图 7所示， 中继站 720包括中继接收模块 722、存储模块 724 和中继发射模块 726。 中继接收模块 722用于接收到从所述移动台发 送的数据。 存储模块 724用于存储所接收的来自移动台的数据。 接收 模块 722还用于接收从基站反馈的响应。 当接收模块 722接收到来自 基站的用于指示译码结果不正确的响应或重传请求时， 中继发射模块 726向基站重传存储模块 724的数据。
[51] 存储模块 724可以在接收模块 722接收到来自基站的用于指示 译码结果正确的响应时清除其存储的数据。 可选地， 存储模块 724可 以在接收模块 722在一预定的时间内未接收到来自基站的响应时清除 其存储的数据。
[52] 在一个示例中， 中继站 720还可包括编码调制模块 728。 编码 调制模块 728用于对要重传的数据重新进行编码和调制并将经编码和 调制的数据发送给中继发射模块 726。 中继发射模块 726可以重传经 编码调制模块 728编码和调制的数据。
[53] 编码调制模块 728可以釆用下列编码和调制方式中的任一种对 要重传的数据进行编码和调制： 与移动台发送数据的编码和调制方式 相同的编码和调制方式、根据中继站与基站之间的信道状况而自适应 选择的编码和调制方式或者预定的编码和调制方式。
[54] 可选地， 中继发射模块 726在重传数据时可以使用移动台向基 站发送数据时所使用的时频资源， 当然， 也可以使用其他时频资源。
[55] 可选地， 中继发射模块 726可以釆用同步重传方式或者异步重 传方式来重传数据。
[56] 图 8示意性的给出了图 7所示的中继站进行数据处理的流程的 一个示例。 如图 8所示， 在步骤 801， 中继站接收并存储来自移动台 的数据。 在步骤 803， 中继站接收来自基站的译码响应。 在步骤 805， 中继站判断译码响应是否为指示译码结果正确的 ACK。 如果所接收 到的响应是 ACK, 则转向步骤 807， 否则转向 809。
[57] 在步骤 807， 中继站的存储模块释放之前保存的数据， 并结束 数据重传。 可选地， 当在一预定的时间段内接收不到来自基站的响应 时， 中继站也可释放之前保存的数据， 并结束数据重传。
[58] 在步骤 809， 中继站判断已执行过的重传次数是否已达到最大 重传次数， 如果已达到， 则结束数据重传， 否则转向步骤 811。
[59] 如图 6所示， 对重传次数的判断还可以由基站进行。 换言之， 中继站的处理流程可以不包括步骤 809。
[60] 在步骤 811， 中继站对要重传的数据进行处理并进行重传。 可 选地， 中继站可以将所存储的来自移动台的数据直接发送给基站， 也 可以对重传的数据重新进行编码和调制。可以釆用下列编码和调制方 式中的任一种对要重传的数据进行编码和调制： 与移动台发送数据的 编码和调制方式相同的编码和调制方式、根据中继站与基站之间的信 [61] 在一个示例中， 中继站在重传数据时可以使用移动台向基站发 送数据时所使用的时频资源， 以节约资源， 当然， 也可以根据实际需 要而使用其他时频资源。
[62] 在一个示例中， 中继站可以根据实际需要釆用同步重传方式或 者异步重传方式来重传数据。
[63] 如本领域的普通技术人员可以理解的， 上述数据处理流程可以 不按照上面描述的顺序执行。 在可以实现本发明的原理的前提下， 可 以釆用其他顺序或插入一个或多个另外的步骤，也可以选择不执行其 中的一个或多个不必要的步骤。
[64] 图 9示意性地给出了根据本发明一个实施例的移动台进行数据 处理的流程。 如图 9所示， 在步骤 901， 移动台向中继站和基站发送 数据。 在步骤 903， 移动台接收来自基站的译码响应信号 ACKMS。 在 步骤 905，移动台判断是否有新的调度指令，如果有，则转向步骤 901。
[65] 图 10中的 (a)和 (b)分别示出了当基站将反馈给移动台和中继站 的响应包括在不同译码响应信号和同一译码响应信号中时译码响应 信号的示例。
[66] 如图 10(a)所示，基站将反馈给移动台和中继站的响应包括在不 同译码响应信号之中，釆用不同的资源分别发送对应移动台和中继站 的译码响应信号。 两译码响应信号都釆用 BPSK调制， 即 ACK映射 为 +1， NACK映射为 -1。
[67] 如图 10(b)所示，基站将反馈给移动台和中继站的响应包括在同 一译码响应信号之中，釆用相同的资源发送对应移动台和中继站的译 码响应信号。 例如将 NACKMS映射 -1， 将为将 (NACKRS， ACKMS)映 射为 (l+i)/sqrt(2)，或者将 (ACKRS， ACKMS)映射为 (l-i)/sqrt(2)。此处， sqrt(2)表示 2的平方根。
[68] 本领域的普通技术人员可以理解， 在此示出的映射方式仅仅是 示例性的， 还可以使用其他按照此规律的映射方式。
[69] 才艮据本发明的实施例的方案可以应用于例如 TDD (时分双工） 和 FDD (频分双工） 系统中。 [70] 对本领域的普通技术人员而言， 能够理解本发明的方法和设备 的全部或者任何步骤或者部件， 可以在任何计算设备 (包括处理器、 存储介质等）或者计算设备的网络中， 以硬件、 固件、 软件或者它们 的组合加以实现，这是本领域普通技术人员在阅读了本发明的说明的 情况下运用他们的基本编程技能就能实现的， 因此在这里省略了详细 说明。
[71] 因此， 基于上述理解， 本发明的目的还可以通过在任何信息处 理设备上运行一个程序或者一组程序来实现。所述信息处理设备可以 是公知的通用设备。 因此， 本发明的目的也可以仅仅通过提供包含实 现所述方法或者设备的程序代码的程序产品来实现。 也就是说， 这样 的程序产品也构成本发明，并且存储有这样的程序产品的存储介质也 构成本发明。 显然， 所述存储介质可以是任何公知的存储介质或者将 来所开发出来的任何存储介质， 因此也没有必要在此对各种存储介质 一一列举。
[72] 在本发明的设备和方法中，显然，各部件或各步骤是可以分解、 组合和 /或分解后重新组合的。 这些分解、 组合和 /或重新组合应视为 本发明的等效方案。
[73] 以上描述了本发明的优选实施方式。 本领域的普通技术人员知 道， 本发明的保护范围不限于这里所公开的具体细节， 而可以具有在 本发明的精神实质范围内的各种变化和等效方案。

Claims

权 利 要 求 书
1. 一种用于无线通信系统中的数据传输方法，所述无线通信系统 包括基站、 移动台以及对所述移动台透明的中继站， 所述方法包括： 所述基站接收从所述移动台发送的第一信号，对所述第一信号进 码， 并在译码的结果不正确时， 向所述中继站发送用于指示译码 不正确的响应， 而不向所述移动台发送用于指示译码不正确的响应。
2. 如权利要求 1所述的方法，还包括： 所述基站在所述译码的结 果不正确时向所述移动台发送用于指示译码正确的响应。
3. 如权利要求 1所述的方法，还包括： 所述基站在接收到从所述 移动台发送的第一信号时向所述移动台发送用于指示译码正确的响 应。
4. 如权利要求 1-3中任一项所述的方法， 还包括：
所述中继站接收从所述移动台发送的所述第一信号并保存，并在 接收到来自所述基站的用于指示译码不正确的响应时向所述基站发 送基于所述第一信号而生成的第二信号； 以及
所述基站在接收到所述第二信号后将所述第二信号与所述第一 信号合并后译码对所述第二信号进行译码； 当译码结果不正确时， 所 述基站判断已执行过的重传的次数是否小于预设的最大重传次数，如 果已执行过的重传的次数小于所述预设的最大重传次数，所述基站向 所述中继站发送重传请求以使得所述中继站再次发送所述第二信号。
5. 如权利要求 4所述的方法，其中，所述第二信号与所述第一信 号相同，或者所述第二信号是釆用下列编码和调制方式中的任一种对 所述第一信号中的数据进行编码和调制而生成的：根据所述中继站与 所述基站之间的信道状况而自适应选择的编码和调制方式或者预定 的编码和调制方式。
6. 如权利要求 4所述的方法，其中，所述第二信号是使用与所述 第一信号相同的时频资源或者使用其他时频资源来发送的。
7. 如权利要求 4所述的方法，其中，所述第二信号的发送釆用同 步重传方式或者异步重传方式。
8. 一种用于无线通信系统中的基站， 包括：
接收模块，用于接收来自所述无线通信系统中的移动台或中继站 的信号；
译码模块，用于在所述接收模块接收到从所述移动台发送的第一 信号或从所述中继站发送的第二信号时对所接收的信号进行译码； 判断模块， 用于判断所述译码模块译码的结果是否正确； 及 响应反馈模块， 用于向所述中继站或移动台反馈响应， 其中， 在所述判断模块判断出所述译码模块译码的结果不正确 时， 所述响应反馈模块向所述中继站发送用于指示译码不正确的响 应， 而不向所述移动台发送用于指示译码不正确的响应。
9. 如权利要求 8所述的基站， 其中， 所述响应反馈模块还用于 在所述判断模块判断出对所述第一信号的译码的结果不正确时向所 述移动台发送用于指示译码正确的响应。
10. 如权利要求 8所述的基站， 其中， 所述响应反馈模块还用于 在所述接收模块接收到所述第一信号时向所述移动台发送用于指示 译码正确的响应。
11. 如权利要求 8所述的基站， 其中， 所述判断模块还用于在对 所述第二信号的译码的结果不正确时判断已执行过的重传的次数是 否小于预设的最大重传次数，并且在已执行过的重传的次数小于所述 预设的最大重传次数情况下，指示所述响应反馈模块向所述中继站发 送重传请求以使得所述中继站再次发送所述第二信号。
12. 一种无线通信系统， 所述无线通信系统包括移动台以及对所 述移动台透明的中继站， 还包括如权利要求 8-11 中任一项所述的基 站， 其中，
所述移动台包括用于向上行发送第一信号的发射模块； 所述中继站包括用于接收从所述移动台发送的第一信号或者从 所述基站发送的重传请求的中继接收模块、用于保存所述第一信号的 存储模块以及用于响应于所接收到的重传请求而向基站发送基于所 述第一信号而生成的第二信号的中继发射模块。
13. 如权利要求 12所述的无线通信系统，其中，所述第二信号与 所述第一信号相同。
14. 如权利要求 12所述的无线通信系统，其中所述中继站还包括 编码调制模块，所述编码调制模块用于釆用下列编码和调制方式中的 任一种对所述第一信号中的数据进行编码和调制以生成所述第二信 号：根据所述中继站与所述基站之间的信道状况而自适应选择的编码 和调制方式或者预定的编码和调制方式。
15. 如权利要求 12-14中任一项所述的无线通信系统， 其中， 所 述中继发射模块使用所述移动台发送所述第一信号时所使用的时频 资源或者使用其他时频资源来发送所述第二信号。
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