WO2011075864A1 - 载波聚合系统中多个确认信号的传输方法和用户设备 - Google Patents

载波聚合系统中多个确认信号的传输方法和用户设备 Download PDF

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Publication number
WO2011075864A1
WO2011075864A1 PCT/CN2009/001514 CN2009001514W WO2011075864A1 WO 2011075864 A1 WO2011075864 A1 WO 2011075864A1 CN 2009001514 W CN2009001514 W CN 2009001514W WO 2011075864 A1 WO2011075864 A1 WO 2011075864A1
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Prior art keywords
ack
nack
pucch
user equipment
signal
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PCT/CN2009/001514
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English (en)
French (fr)
Inventor
梁学俊
李剑
王泽权
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Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
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Alcatel Lucent Shanghai Bell Co Ltd
Alcatel Lucent SAS
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Application filed by Alcatel Lucent Shanghai Bell Co Ltd, Alcatel Lucent SAS filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to PCT/CN2009/001514 priority Critical patent/WO2011075864A1/zh
Priority to CN200980162156.7A priority patent/CN102598741B/zh
Publication of WO2011075864A1 publication Critical patent/WO2011075864A1/zh
Anticipated expiration legal-status Critical
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1858Transmission or retransmission of more than one copy of acknowledgement message
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1854Scheduling and prioritising arrangements

Definitions

  • Embodiments of the present invention relate to a wireless communication method, and in particular, to a method and user equipment for transmitting a plurality of acknowledgment signals in a carrier aggregation system. Background technique
  • the LTE-Advanced mobile communication system will support a higher spectral bandwidth than LTE Rel-8. These spectrums may be scattered in many scattered channels, and these spectrums need to be used together.
  • Carrier aggregation technology is used to solve this problem, that is, the system can transmit or receive data on multiple frequency bands simultaneously according to its actual capabilities.
  • a consensus has been reached - • Support for symmetric and asymmetric carrier aggregation.
  • the CC corresponding to the downlink control channel PDCCH is indicated by a 0-3 bit carrier indication field (CIF).
  • the uplink carrier (UL CC) needs to transmit a plurality of ACK/NACK acknowledgment signals.
  • the DL CC maintains a one-to-one correspondence with the UL CC, as shown in Figure 1.
  • the HARQ design of Rel-8 can be directly extended, and the ACK/NACK signal corresponding to the DL CC is transmitted on each UL CC.
  • this method causes an increase in the CM value and a decrease in the transmission power of the ACK/NACK signal, thereby affecting the transmission performance.
  • different power control may be required, which leads to an increase in application complexity, which is designed for HARQ (Hybrid Automatic Repeat Request) that directly extends Rel-8. Brought difficulties.
  • the UL CC and the DL CC no longer have a one-to-one correspondence. In most cases, the number of DL CCs is greater than the UL CC. As shown in FIG. 2, one UL CC needs to be simultaneously at the same time. Each DL CC transmits an ACK7NACK signal.
  • One method is to set multiple PUCCHs (Physical Uplink Control Channels) on one UL CC, allowing The user maps the ACK/NACK signals corresponding to each DL CC in parallel to the respective PUCCH channels.
  • PUCCHs Physical Uplink Control Channels
  • this method can maximize the Rel-8 PUCCH TX/RX design process, it will increase the CM value and reduce the transmission power, which will deteriorate the transmission performance of edge users.
  • the number of DL CCs is large, it is difficult to meet the system performance requirements by simply using multi-channel transmission.
  • Another method can transmit multiple ACK/NACK signals using bundling/multiplexing similar to LTE Rel-8 TDD.
  • Signal binding generates an ACK/NACK signal by logically ANDing the corresponding acknowledgment bits on multiple DL CCs.
  • the use of signal binding results in a large number of unnecessary retransmissions, which seriously degrades the spectral efficiency of the system. Therefore, ACK7NACK signal binding is not suitable for carrier aggregation systems.
  • Signal multiplexing uses a combination of signal transmission and PUCCH resource selection to represent multiple ACK/NACK information.
  • the signal multiplexing in Rel-8 TDD supports up to 4 ACK/NACK signal transmissions, and cannot satisfy the maximum of 5 20MHz bandwidth carrier aggregation systems.
  • a method for transmitting a plurality of acknowledgment signals ACK/NACK in a carrier aggregation system comprising the steps of: establishing a certain downlink aggregated carrier DL CC and an uplink aggregated carrier UL CC. Corresponding relationship; transmitting, by using two physical uplink control channels, PUCCH, all ACK/NACK bits on one UL CC, where the first PUCCH transmits an ACK/NACK signal corresponding to the certain DL CC, and the second PUCCH uses a transmission signal A method combined with transport channel selection to carry multiple ACK/NACK bits.
  • the certain DL CC may be an anchor carrier.
  • an ACK/NACK signal of the remaining DL CCs except the certain DL CC is transmitted by means of Rd-8 TDD ACK/NACK signal multiplexing.
  • ACK/NACK bits of all codes in each DL CC are logically ANDed and bound as a single ACK/NACK information.
  • a transmission signal of two bits is generated according to ACK/NACK information of each DL CC.
  • the transmission signal and the channel selection result jointly represent an ACK/NACK signal of the remaining DL CCs other than the certain DL CC.
  • a table capable of reflecting the above correspondence relationship is maintained at both the base station and the user equipment.
  • the base station blindly detects the resources occupied by the second PUCCH, and after decoding the corresponding bits, finds the ACK7NACK information corresponding to each DL CC from the above table.
  • the transmission process in the first PUCCH is performed based on Rel-8 FDD.
  • a user equipment for transmitting a plurality of acknowledgment signals ACK/NACK in a carrier aggregation system including: a control unit, establishing a certain downlink aggregate carrier DL CC and an uplink aggregate carrier UL a one-to-one correspondence between CCs; a transceiver unit that transmits all ACK/NACK bits by using two physical uplink control channels PUCCH on one UL CC, where the first PUCCH transmits an ACK/NACK signal corresponding to the certain DL CC
  • the second PUCCH employs a combination of a transmission signal and a transmission channel selection to carry a plurality of ACK/NACK bits.
  • multiple ACK/NACK signals can be transmitted on one UL CC, which can satisfy both symmetric and asymmetric carrier aggregation, and avoid the complexity brought by designing different HARQ schemes.
  • the Rd-8 TDD HARQ transmission mechanism is applied to the carrier aggregation system to minimize the modification of the standard, and the actual performance has been verified.
  • LTE Rel-8 users can use it in the LTE-A network.
  • LTE users can only identify one PUCCH channel and LTE-A users can identify two PUCCH channels simultaneously.
  • FIG. 1 shows a schematic diagram of transmitting a plurality of ACK/NACK information in a symmetric carrier aggregation system according to the prior art
  • FIG. 3 is a block diagram showing the structure of a multi-carrier aggregation system according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram showing transmission of multiple ACK/NACK information on two PUCCHs of one UL CC according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram showing transmission of 4 ACK/NACK information on two PUCCHs of one UL CC according to an embodiment of the present invention
  • Figure 6 shows a schematic diagram of multiplexing ACK/NACK
  • FIG. 7 shows a flow chart of an operation procedure of a multi-carrier aggregation system according to an embodiment of the present invention. detailed description
  • a PUCCH channel extension combined with ACK/NACK signal multiplexing is used to implement transmission of multiple ACK/NACK signals on one UL CC.
  • FIG. 3 is a block diagram showing the structure of a multi-carrier aggregation system according to an embodiment of the present invention.
  • a base station according to an embodiment of the present invention includes a transceiver unit 11 that performs message transmission and reception, a storage unit 14 that stores various data or tables, and a detection of an operation such as blind detection on a signal received by the transceiver unit.
  • the user equipment includes a transceiving unit 21 that performs messaging, a storage unit 23 that stores various data or tables, and a control unit 22 that controls various units or modules of the user equipment.
  • a transceiving unit 21 that performs messaging
  • a storage unit 23 that stores various data or tables
  • a control unit 22 that controls various units or modules of the user equipment.
  • all ACK/NACK bits are transmitted using two PUCCH channels (PUCCH 1 and PUCCH 2) on one UL CC.
  • PUCCH 1 uses the same design as Rel-8 FDD, An ACK/NACK signal used to transmit a certain DL CC.
  • PUCCH 2 uses a similar design to Rel-8 TDD ACK/NACK signal multiplexing, using a combination of transmission signals and transmission channel selection to carry multiple ACK/NACK signals. Specifically, please refer to Figure 4.
  • a UL CC needs to feed back up to N ACK/NACK signals.
  • a certain DL CC needs to be first determined to form a one-to-one relationship with the UL CC, and a table in which the correspondence relationship is recorded is stored in the storage unit of the base station and the user equipment.
  • the selection of the DL CC is based on the actual carrier aggregation scenario, such as an anchor carrier.
  • the introduction of the anchor carrier can save control information overhead and improve control signal coverage, and is highly likely to be applied to the LTE-A system.
  • DL CC#n is selected to form a one-to-one relationship with the UL CC.
  • PUCCH 1 only the ACK/NACK signal corresponding to DL CC#n is transmitted, and the resource occupied by PUCCH 1 is “ CCH by n CCE , n and N?
  • the UCCH jointly determines that ncc E> n is the lowest resource number occupied by the PDCCH indicating the PDSCH in the DL CC#n, and N eOT is the offset configured by the upper layer.
  • the processing of the PUCCH 1 is exactly the same as the Rel-8 FDD.
  • the ACK/NACK signals of the remaining N-1 DL CCs are transmitted in PUCCH 2, and the Rd-8 TDD ACK/NACK signal is multiplexed.
  • N is greater than 2
  • the acknowledgment bits of all codewords in each DL CC are logically ANDed and bound to a single ACK/NACK information.
  • N is equal to 2
  • the binding process can be omitted.
  • the control unit 22 of the user equipment generates a two-bit transmission signal 6(0) b ⁇ ) to determine the transmission resource, «3 ⁇ 4 ccw is available from ( ,,, " ⁇ TM , ..., " ⁇ -,) selects 'L is the lowest transmission resource number n CCE occupied by the PDCCH indicating the PDSCH in the DL CC #i, and is determined together with the offset N3 ⁇ 4 eCT configured by the upper layer.
  • the transmitted signal (6(0) 6(1)) and the channel selection result/joint represent the DL DL CCs
  • Correlation Table in Rel-8 TDD (TS 36.213 Table 10.1-2, Table 10.1-3, Table 10.1 -4) 0
  • the above table can be stored in the storage unit 14 of the base station and the storage unit 23 of the user equipment.
  • PUCCH 2 needs to support up to four ACK/NACK signals, so Rel-8 TDD ACK/NACK signal multiplexing can be used directly, and only need to replace the subframe with DL CC.
  • Multiple ACK/NACK signals can be transmitted on one UL CC, which can satisfy both symmetric and asymmetric carrier aggregation, avoiding the complexity of designing different HARQ schemes.
  • LTE Rel-8 users can use it in LTE-A networks.
  • LTE users can only identify one PUCCH channel and LTE-A users can identify two PUCCH channels simultaneously.
  • the embodiments of the present invention can provide a unified and efficient ACK/NACK signal transmission scheme for different carrier aggregation scenarios, which is in line with the development requirements of the LTE-A system.
  • FIG. 5 is a flow chart showing the operation of various units and modules of a communication system in accordance with an embodiment of the present invention.
  • the ACK/NACK information of each DL CC PDSCH is represented as one bit, the ACK is represented by a bit, and the NACK is represented by a bit "0".
  • the ACK/NACK bit on the DL CC is represented as d ⁇ i).
  • the control unit 22 of the user equipment selects DL CC #3 to form a one-to-one relationship with the UL CC.
  • the PUCCH format la in Rel-8 is used, 3) a symbol is generated by BPSK modulation, and then transmitted in the PUCCH 1 through the transceiver unit 21 after being extended in the time domain and the frequency domain.
  • the resource used by PUCCH 1 " rcw by DL CC
  • the minimum resource number nc CE . 3 occupied by the corresponding PDCCH of the PDSCH in #3 is jointly determined by the offset N eCT of the high layer configuration, and the entire processing process is performed by Rel 8 and executed by the control unit 22.
  • the transceiver unit of the base station receives the corresponding signal, and after the detection unit 13 decodes the ACK/NACK information in the PUCCH 1, it determines that the DL CC #3 is received correctly, and does not need to retransmit.
  • the transceiver unit 21 of the user equipment correctly receives the PDSCH in DL CC #0 and DL CC #2, and the PDSCH reception error in the DL CC #1, the ACK/NACK information to be transmitted is represented as (ACK) NACK ACK).
  • the control unit 22 determines the bit information corresponding to (ACK, NACK, ACK) according to the mapping relationship stored in the storage unit 23 defined in the table of FIG. 6 & (0) 6 (1) and resources are divided into 7J West ⁇ P ' «'P( 2 U)CCH , ' n "P (2 U ) CCH y (n n P m UCCH fi ⁇ nP 2 U ) CCH , V "P( 2 U ) CCH, 2,) 1 is taken.
  • the detecting unit 13 of the base station blindly detects the resource 4 eCT occupied by the PUCCH 2.
  • the control unit 15 can find the ACK/NACK information corresponding to each DL CC from the table stored in the storage unit 14, and in this example, the corresponding is (ACK, NACK, ACK).
  • the HARQ unit 12 of the base station confirms the PDSCH data in the DL CC #0 and the DL CC #2, and retransmits the PDSCH data in the DL CC #1.
  • each of the components shown in FIG. 3 can be implemented by a plurality of devices in practical applications, and multiple Components can also be integrated into a single chip or a device in a practical application.
  • Even a central entity may be a physical or logical portion of a base station that functions as described in embodiments of the present invention. It will be understood by one of ordinary skill in the art that the base station and central entity in embodiments of the present invention may also include any unit or device for other purposes.
  • a unified ACK/NACK signal transmission can be provided for different carrier aggregation scenarios.
  • the LTE-A system meet the demand for multiple ACK/NACK signals transmitted by a single UL CC, but also ensure backward compatibility with LTE Rel-8 users, which is in line with the development trend of LTE-A.
  • the above solution can guarantee support for various carrier aggregation scenarios, including symmetric and asymmetric carrier aggregation. It has the advantages of backward compatibility and small standard changes, without the deterioration of CM value, and meets the requirements of multi-ACK/NACK transmission with minimum complexity.
  • some embodiments also include a program readable or computer readable program storage device (eg, a digital data storage medium) and an encoded machine executable or computer executable program instructions, wherein the instructions are executed Take some or all of the steps above.
  • the program storage device can be a digital memory, a magnetic storage medium (such as a magnetic disk and magnetic tape), a hardware or an optically readable digital data storage medium.
  • Embodiments also include a programming computer that performs the steps of the above method.

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Description

载波聚合系统中多个确认信号的传输方法和用户设备 技术领域
本发明的实施例涉及无线通信方法, 具体涉及一种在载波聚合系统中传输多个确 认信号的方法和用户设备。 背景技术
LTE-Advanced移动通信系统将支持比 LTE Rel-8更高的频谱带宽, 这些频谱可能 分散在很多的零散通道里, 需要将这些频谱集合起来使用。 载波聚合技术用来解决这 —问题, 即系统可根据自己的实际能力同时在多个频段上发送或接收数据。 关于载波 聚合技术的应用, 已达成的共识有- • 支持对称与非对称的载波聚合。
• 从用户的角度讲,每个聚合载波 (CC)上对应一个传输块 TB和一个 HARQ实体
(无空间复用时)。
• 与下行控制信道 PDCCH对应的 CC由 0-3比特的载波指示域 (CIF)指示。 根据上述共识, 在载波聚合系统中, 当用户在多个下行载波 (DL CC)上存在下行 数据信道 (PDSCH)时, 上行载波 (UL CC)需要传输多个 ACK/NACK确认信号。在对称 的载波聚合场景下, DL CC与 UL CC保持一一对应关系, 如图 1所示。 此时, 可以 直接扩展 Rel-8的 HARQ设计, 在各个 UL CC上传输对应 DL CC的 ACK/NACK信 号。 然而, 这种方法会导致 CM值的增大和 ACK/NACK信号传输功率的减小, 从而 影响传输性能。又由于各个 DL CC之间不同的传播环境和干扰条件,可能需要不同的 功率控制, 这会带来应用复杂度的增加, 这些都为直接扩展 Rel-8的 HARQ (混合自 动重传请求)设计带来了困难。 另外, 在非对称的载波聚合场景下, UL CC与 DL CC 不再具有一一对应关系, 大多数情况下 DL CC数目大于 UL CC, 如图 2所示, 此时 一个 UL CC需要同时为多个 DL CC传输 ACK7NACK信号。
为了能支持对称和非对称的载波聚合, 避免在不同载波聚合场景下采用不同方 法, 必须在 Rel-8上行 HARQ反馈的基础上, 设计一种高效的, 能让多个 ACK/NACK 信号在一个 UL CC上传输的方法。
对于多个 ACK/NACK信号在一个 UL CC上传输的问题, 目前存在的方法如下: 一种方法是可以在一个 UL CC上设置多个 PUCCH (物理上行控制信道), 允许 用户将每个 DL CC对应的 ACK/NACK信号平行映射到各个 PUCCH信道。 然而, 该 方法虽然可以最大限度的保留 Rel-8的 PUCCH TX/RX设计过程, 但会带来 CM值的 增加和传输功率的降低,这会恶化边缘用户的传输性能。尤其是当 DL CC数目较多时, 简单的运用多信道传输难以满足系统性能要求。
另一种方法可以采用与 LTE Rel-8 TDD类似的绑定 /复用来传输多个 ACK/NACK 信号。 信号绑定通过对多个 DL CC 上对应的确认比特进行逻辑与运算, 生成一个 ACK/NACK信号。 但是, 与 TDD连续下行传输子帧间存在较大的时间相关性不同, 由于各个 DL CC经历不同的传播衰落和干扰, 尤其在非连续载波聚合时, DL CC之 间数据传输的相关性较小, 采用信号绑定会导致大量不必要的重传, 严重降低系统的 频谱效率。 因此, ACK7NACK信号绑定并不适用于载波聚合系统。 信号复用采用信 号传输与 PUCCH资源选择相结合的方式来表示多个 ACK/NACK信息。 Rel-8 TDD中 的信号复用最多支持 4个 ACK/NACK信号传输,也无法满足最大 5个 20MHz带宽的 载波聚合系统。
还有一些方法, 比如减小正交扩展因子, 采用高阶调制信号或联合编码等, 都需 要重新设计 PUCCH TX/RX过程, 无法兼容 Rd-8标准, 并会造成传输性能下降和控 制信道覆盖受限, 在实际中难以应用。 发明内容
本发明的目的是提供一种在多载波聚合系统中传输多个确认信号的方法和用户 设备。
在本发明的一个方面,提出了一种载波聚合系统中传输多个确认信号 ACK/NACK 的方法, 包括步骤: 建立某一下行链路聚合载波 DL CC与上行链路聚合载波 UL CC 的一一对应关系; 在一个 UL CC上采用两个物理上行控制信道 PUCCH传输所有的 ACK/NACK比特,其中,第一 PUCCH传输与该某一 DL CC相对应的 ACK/NACK信 号,第二 PUCCH采用传输信号与传输信道选择相结合的方法来承载多个 ACK/NACK 比特。
根据本发明的实施例, 该某一 DL CC可以是锚载波。
根据本发明的实施例, 在第二 PUCCH中, 采用 Rd-8 TDD ACK/NACK信号复用 的方式, 传输除该某一 DL CC外的其余 DL CC的 ACK/NACK信号。 根据本发明的实施例,各个 DL CC内所有码宇的 ACK/NACK比特做逻辑与运算, 绑定为单个 ACK/NACK信息。
根据本发明的实施例,在第二 PUCCH中,根据各个 DL CC的 ACK/NACK信息, 生成两个比特的传输信号。
根据本发明的实施例,传输信号和信道选择结果联合表示了除该某一 DL CC之外 的其余 DL CC的 ACK/NACK信号。
根据本发明的实施例, 在基站和用户设备都维持能够反映上述对应关系的表格。 根据本发明的实施例, 基站盲检测第二 PUCCH所占用的资源, 并解码得到相应 的比特后, 从上述表格中査到各个 DL CC对应的 ACK7NACK信息。
根据本发明的实施例, 第一 PUCCH中的传输过程是基于 Rel-8 FDD而进行的。 在本发明的另一方面,提出了一种载波聚合系统中传输多个确认信号 ACK/NACK 的用户设备, 包括: 控制单元, 建立某一下行链路聚合载波 DL CC与上行链路聚合载 波 UL CC的一一对应关系; 收发单元, 在一个 UL CC上采用两个物理上行控制信道 PUCCH传输所有的 ACK/NACK比特, 其中, 第一 PUCCH传输与该某一 DL CC相 对应的 ACK/NACK信号, 第二 PUCCH采用传输信号与传输信道选择相结合的方法 来承载多个 ACK/NACK比特。
利用上述方法和用户设备, 在一个 UL CC上能传输多个 ACK/NACK信号, 可以 同时满足对称和非对称载波聚合, 避免了设计不同 HARQ方案带来的复杂度。
另外, 将 Rd-8 TDD HARQ传输机制应用到载波聚合系统中, 最大程度的减小了 对标准的改动, 实际性能己经得到验证。
另外, 上述方法具有后向兼容性, LTE Rel-8用户可以在 LTE-A网络中使用。 LTE 用户只能识别一个 PUCCH 信道而 LTE-A用户可以同时识别两个 PUCCH信道。 附图说明
通过下面结合附图说明本发明的优选实施例, 将使本发明的上述及其它目的、 特 征和优点更加清楚, 其中:
图 1示出了根据现有技术的对称载波聚合系统中传输多个 ACK/NACK信息的示 意图;
图 2示出了根据现有技术的非对称载波聚合系统中传输多个 ACK/NACK信息的 示意图;
图 3示出了根据本发明实施例的多载波聚合系统的结构框图;
图 4 示出了根据本发明实施例的在一个 UL CC 的两个 PUCCH 上传输多个 ACK/NACK信息的示意图;
图 5 示出了根据本发明实施例的在一个 UL CC 的两个 PUCCH 上传输 4 个 ACK/NACK信息的示意图;
图 6示出了对 ACK/NACK进行复用的示意图;
图 7示出了根据本发明实施例的多载波聚合系统的操作过程的流程图。 具体实施方式
下面将说明本发明的多种实施例。 随后的说明提供了对这些实施例的全面理解的 详细细节。但是, 本领域的技术人员应当了解, 无需一些所述细节也可以实施本发明。 此外, 可能不会示出或详细说明一些公知的结构或者功能, 以免不必要地使本发明多 种实施例的相关说明不清楚。 在下述说明中使用的术语即使是与本发明某些具体实施例的详细说明结合使用 的, 也要以其最宽的合理方式解释该术语。 某些术语可能会在下面予以强调.但是, 任 何准备以某种受限的方式进行解释的术语将会在具体实施方式部分给予公开及明确 的定义。
根据本发明的实施例, 采用 PUCCH信道扩展与 ACK/NACK信号复用相结合的 方法, 实现多个 ACK/NACK信号在一个 UL CC上的传输。
图 3示出了根据本发明实施例的多载波聚合系统的结构框图。 如图 3所示, 根据 本发明实施例的基站包括执行消息收发的收发单元 1 1、存储各种数据或者表格的存储 单元 14、 对收发单元接收的信号进行诸如盲检测之类的操作的检测单元 13、 执行 HARQ功能的重传单元 12、 以及控制基站的各个单元或模块的控制单元 15。
根据本发明实施例的用户设备包括执行消息收发的收发单元 21、存储各种数据或 者表格的存储单元 23和控制用户设备的各个单元或模块的控制单元 22。 下面详细描 述本发明实施例的通信系统的详细构成和操作过程。
根据本发明的实施例, 在一个 UL CC上采用两个 PUCCH信道 (PUCCH 1和 PUCCH 2)传输所有的 ACK/NACK比特。 PUCCH 1使用与 Rel-8 FDD相同的设计, 用于传输某一 DL CC的 ACK/NACK信号。 PUCCH 2使用与 Rel-8 TDD ACK/NACK 信号复用相似的设计, 采用传输信号与传输信道选择相结合的方法来承载多个 ACK/NACK信号。 具体来讲, 请参考图 4。
图 4中所示 N个 DL CC的情景, 一个 UL CC最多需要反馈 N个 ACK/NACK信 号。 本发明实施例中, 需要首先确定某一 DL CC, 与 UL CC构成一对一的关系, 在 基站和用户设备的存储单元中都存储记录了该对应关系的表格。该 DL CC的选取根据 实际载波聚合场景而定, 比如锚载波。 同时, 锚载波的引入可以节省控制信息开销, 提高控制信号覆盖, 极有可能应用到 LTE-A系统中。
图 4中选取 DL CC#n与 UL CC形成一对一的关系, PUCCH 1中只传输 DL CC#n 对应的 ACK/NACK信号, PUCCH 1所占据的资源 " CCH由 nCCE,n和 N?UCCH共同决定, nccE>n为指示 DL CC#n中 PDSCH的 PDCCH所占据的最低资源序号, N eOT是由高层 配置的偏移量。 PUCCH 1的处理过程与 Rel-8 FDD完全相同。
PUCCH 2 中传输其余 N-1 个 DL CCs 的 ACK/NACK信号, 采用 Rd-8 TDD ACK/NACK信号复用的方式。 当 N大于 2时, 各个 DL CC内所有码字的确认比特做 逻辑与运算, 绑定为单个 ACK/NACK信息。 当 N等于 2时, 该绑定过程可省略。
PUCCH 2根据各个 DL CC的 ACK/NACK信息, 用户设备的控制单元 22生成两 个 比特 的传输信号 6(0) b{\) , 确 定传输资 源 , «¾ccw 可从 ( ,,,"^™,...,"^^-,)中选取' L 由指示 DL CC#i中 PDSCH的 PDCCH 所占据的最低传输资源序号 nCCE,,和由高层配置的偏移量 N¾eCT共同决定。 传输信号 (6(0) 6(1))和信道选择结果/ 联合表示了 ΝΛ 个 DL CCs 的
ACK/NACK信号。 (0) 6(1)), " «^和 ACK/NACK信号之间的映射关系可以参考
Rel-8 TDD中相关表格 (TS 36.213 Table 10.1-2, Table 10.1-3, Table 10.1 -4) 0上述表格可以 存储在基站的存储单元 14和用户设备的存储单元 23中。
PUCCH 2最多需要支持四个 ACK/NACK信号, 因此 Rel-8 TDD ACK/NACK信 号复用可以直接使用, 只需要将子帧替换为 DL CC。
由于一个 UL CC只存在两个 PUCCH,很容易解决 PUCCH 1和 PUCCH 2的资源 分配问题, 只需由高层为 PUCCH 1 和 PUCCH 2 配置具有不同偏移量的 N^OT和 ^^值即可。 通过上面的描述可知, 本发明实施例的方案具有以下特点:
♦ 在一个 UL CC上能传输多个 ACK/NACK信号, 可以同时满足对称和非对称载 波聚合, 避免了设计不同 HARQ方案带来的复杂度。
♦ 将 Rel-8 TDD HARQ传输机制应用到载波聚合系统中, 最大程度的减小了对标 准的改动, 实际性能已经得到验证。
♦ 具有后向兼容性, LTE Rel-8用户可以在 LTE-A网络中使用。 LTE用户只能识别 一个 PUCCH 信道而 LTE-A用户可以同时识别两个 PUCCH信道。
♦ 考虑载波聚合系统对 CM要求的适度放松, 该方案所带来 CM值增加较小, 可 以满足系统的要求。
总之, 本发明的实施例能为不同载波聚合场景提供统一的, 高效的 ACK/NACK 信号传输方案, 这符合 LTE-A系统的发展要求。
下面将对本发明实施例的实例进行讨论。 为了便于说明, 以四个 DL CCs和一个 UL CC的载波聚合为例, 如图 5所示, 这并不妨碍本发明实施例提出的 ACK/NACK 信号传输方案应用于其它不同的频谱聚合场景。 图 7示出了根据本发明实施例的通信 系统的各个单元和模块的操作过程的流程图。
如图 5所示, 每个 DL CC PDSCH的 ACK/NACK信息表示为一个比特位, ACK 用比特 " 表示, NACK用比特 "0"表示。 第/个 DL CC上的 ACK/NACK比特表示为 d{i). 本例中, 如图 7所示, 在步骤 S I 1, 用户设备的控制单元 22选取 DL CC #3与 UL CC形成一对一关系。
根据本发明实施例的方案,在步骤 S 12和 S 13 ,假定用户设备的收发单元 21正确 接收到 DL CC #3中 PDSCH的信息, 则需要反馈的 ACK/NACK比特 d(3)=l, 采用 Rel-8中的 PUCCH format la, 3)由 BPSK调制后生成一个符号, 再经过时域和频域 的扩展后通过收发单元 21在 PUCCH 1中传输。 PUCCH 1所使用资源《 rcw由 DL CC
#3中 PDSCH相应的 PDCCH所占据的最低资源序号 ncCE.3和高层配置的偏移量 N eCT 联合决定, 整个处理过程与 Rel 8—致, 由控制单元 22来执行。 基站的收发单元接收 相应的信号, 检测单元 13解码得到 PUCCH 1中的 ACK/NACK信息后, 确定 DL CC #3接收正确, 无需重传。 对于其余 DL CCs,假设用户设备的收发单元 21正确接收到 DL CC #0和 DL CC #2 中的 PDSCH, 而 DL CC #1中的 PDSCH接收错误, 需要传输的 ACK/NACK信息表 示为 (ACK NACK ACK)。
采用 Rel-8 TDD ACK/NACK复用, 控制单元 22根据图 6的表中定义的存储在存 储单元 23中的映射关系, 确定 (ACK, NACK, ACK)所对应的比特信息 & (0) 6(1)及资源 分 7J西 ^ P '«'P(2U)CCH , ' n "P(2U)CCH y (nnPmUCCH fi ^ nP2U)CCH ,V "P(2U)CCH ,2、)中 1诜取。 本例中,需要传输的比特信息为 δ(0) δ(1)=1,1,资源分配《^α^ =«^)0^。, 6(0) 6(1) 经过 QPSK调制后通过收发单元 21在 PUCCH 2上传输。
基站的检测单元 13盲检测 PUCCH 2所占用的资源 4 eCT,。,并解码得到 6(0) b(\ ) 比特后, 便可由控制单元 15 从存储单元 14 存储的表中査到各个 DL CC 对应的 ACK/NACK信息, 本例中对应为 (ACK, NACK, ACK)。在步骤 S14, 基站的 HARQ 单元 12确认 DL CC #0和 DL CC #2中的 PDSCH数据,并重传 DL CC #1中的 PDSCH 数据。
虽然上面以分离的功能模块的形式描述了本发明的实施例所提出的基站和中心 实体, 但是图 3中示出的每一个组件在实际应用中可以用多个器件实现, 示出的多个 组件在实际应用中也可以集成在一块芯片或一个设备中。 甚至中心实体也可以是某一 个基站中起到本发明的实施方式所描述的功能的物理部分或逻辑部分。 本领域普通技 术人员应该理解, 本发明实施方式中的基站和中心实体还可包括用于其它目的的任何 单元或装置。
利用上述方案, 可以为不同载波聚合场景提供统一的 ACK/NACK信号传输。 另夕卜,不仅能满足 LTE-A系统单个 UL CC传输多 ACK/NACK信号的需求,还能 保证对 LTE Rel-8用户的后向兼容, 这符合 LTE-A的发展趋势。
上述方案可以保证同时支持各种载波聚合场景, 包括对称和非对称载波聚合。 具 有后向兼容和标准改动较小等优点, 不会带了 CM值的恶化, 以最小的复杂度满足了 多 ACK/NACK传输的需求。
本领域技术人员应该很容易认识到, 可以通过编程计算机实现上述方法的不同 步骤。 在此, 一些实施方式同样包括机器可读或计算机可读的程序存储设备 (如, 数 字数据存储介质) 以及编码机器可执行或计算机可执行的程序指令, 其中, 该指令执 行上述方法的一些或全部步骤。 例如, 程序存储设备可以是数字存储器、 磁存储介质 (如磁盘和磁带) 、 硬件或光可读数字数据存储介质。 实施方式同样包括执行上述方 法的所述步骤的编程计算机。
描述和附图仅示出本发明的原理。 因此应该意识到, 本领域技术人员能够建议不 同的结构, 虽然这些不同的结构未在此处明确描述或示出, 但体现了本发明的原理并 包括在其精神和范围之内。 此外, 所有此处提到的示例明确地主要只用于教学目的以 帮助读者理解本发明的原理以及发明人所贡献的促进本领域的构思, 并应被解释为不 是对这些特定提到的示例和条件的限制。 此外, 此处所有提到本发明的原则、 方面和 实施方式的陈述及其特定的示例包含其等同物在内。

Claims

权利要求
1、 一种载波聚合系统中传输多个确认信号 ACK/NACK的方法, 包括步骤: 建立某一下行链路聚合载波 DL CC与上行链路聚合载波 UL CC的一一对应关系; 在一个 UL CC上采用两个物理上行控制信道 PUCCH传输所有的 ACK/NACK比 特,
其中,第一 PUCCH传输与该某一 DL CC相对应的 ACK/NACK信号,第二 PUCCH 釆用传输信号与传输信道选择相结合的方法来承载多个 ACK/NACK比特。
2、 如权利要求 1所述的方法, 其中, 该某一 DL CC可以是锚载波。
3、如权利要求 1所述的方法,其中在第二 PUCCH中,釆用 Rel-8 TDD ACK/NACK 信号复用的方式, 传输除该某一 DL CC外的其余 DL CC的 ACK/NACK信号。
4、 如权利要求 3所述的方法, 其中, 各个 DL CC内所有码字的 ACK/NACK比 特做逻辑与运算, 绑定为单个 ACK/NACK信息。
5、 如权利要求 1 所述的方法, 其中, 在第二 PUCCH 中, 根据各个 DL CC的 ACK/NACK信息, 生成两个比特的传输信号。
6、 如权利要求 5 所述的方法, 其中, 传输信号和信道选择结果联合表示了除该 某一 DL CC之外的其余 DL CC的 ACK/NACK信号。
7、 如权利要求 1 所述的方法, 其中, 在基站和用户设备都维持能够反映上述对 应关系的表格。
8、 如权利要求 7所述的方法, 其中, 基站盲检测第二 PUCCH所占用的资源, 并 解码得到相应的比特后, 从上述表格中査到各个 DL CC对应的 ACK/NACK信息。
9、如权利要求 1所述的方法,其中,第一 PUCCH中的传输过程是基于 Rel-8 FDD 而进行的。
10、 一种载波聚合系统中传输多个确认信号 ACK/NACK的用户设备, 包括: 控制单元, 建立某一下行链路聚合载波 DL CC与上行链路聚合载波 UL CC的一 一对应关系;
收发单元, 在一个 UL CC 上采用两个物理上行控制信道 PUCCH 传输所有的 ACK/NACK比特,
其中,第一 PUCCH传输与该某一 DL CC相对应的 ACK/NACK信号,第二 PUCCH 采用传输信号与传输信道选择相结合的方法来承载多个 ACK/NACK比特。
11、 如权利要求 10所述的用户设备, 其中, 该某一 DL CC可以是锚载波。
12、如权利要求 10所述的用户设备,其中在第二 PUCCH中,收发单元采用 Rel-8 TDD AC JNACK 信号复用的方式, 传输除该某一 DL CC 外的其余 DL CC 的 ACK/NACK信号。
13、如权利要求 12所述的用户设备,其中 ,各个 DL CC内所有码字的 ACK/NACK 比特做逻辑与运算, 绑定为单个 ACK/NACK信息。
14、如权利要求 10所述的用户设备, 其中, 在第二 PUCCH中, 收发单元根据各 个 DL CC的 ACK/NACK信息, 生成两个比特的传输信号。
15、 如权利要求 14所述的用户设备, 其中, 传输信号和信道选择结果联合表示 了除该某一 DL CC之外的其余 DL CC的 ACK7NACK信号。
16、 如权利要求 10所述的用户设备, 还包括维持能够反映上述对应关系的表格。
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