WO2013023555A1 - Lte-a tdd不同上下行配比的反馈方法 - Google Patents

Lte-a tdd不同上下行配比的反馈方法 Download PDF

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Publication number
WO2013023555A1
WO2013023555A1 PCT/CN2012/079952 CN2012079952W WO2013023555A1 WO 2013023555 A1 WO2013023555 A1 WO 2013023555A1 CN 2012079952 W CN2012079952 W CN 2012079952W WO 2013023555 A1 WO2013023555 A1 WO 2013023555A1
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Prior art keywords
downlink
uplink
nack
subframe
ack
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PCT/CN2012/079952
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English (en)
French (fr)
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鲁智
陈哲
池连刚
吴联海
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普天信息技术研究院有限公司
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Priority to US14/238,805 priority Critical patent/US20140204811A1/en
Publication of WO2013023555A1 publication Critical patent/WO2013023555A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • 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
    • H04L1/1861Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055Physical resource allocation for ACK/NACK
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469Two-way operation using the same type of signal, i.e. duplex using time-sharing

Definitions

  • the present invention relates to wireless communication technologies, and in particular, to a feedback method for different uplink and downlink ratios of LTE-A time division duplex (TDD).
  • TDD time division duplex
  • the carrier aggregation concept is introduced to support wider bandwidth, ie two or more carriers are aggregated together to support LTE-A transmission bandwidths greater than 20 MHz.
  • TDD time-division duplex
  • the band is the available radio spectrum resource determined by the International Telecommunication Union.
  • the aggregated carriers must adopt the same TDD uplink and downlink ratio.
  • Figure 1 shows the same uplink and downlink ratios for the Rel-10 carrier aggregation scenario.
  • CC1 to CC5 are the carriers participating in the carrier aggregation, D is the downlink subframe of the carrier, U is the uplink subframe of the carrier, and S is the special subframe (each carrier can be configured with different special subframes).
  • the uplink and downlink subframe ratios are as shown in Table 1, for example.
  • Table 1 Table 7 lists the seven uplink-downlink configurations from configuration 0 to configuration 6, where configuration 0 is downlink in subframes 0 and 5, and subframes 2, 3, 4, 7, 8, and 9 are uplinks, so uplink and downlink are configured. The ratio is 3: 1 (not counting 2 special subframes). According to Table 1, the uplink and downlink ratios of other configurations can be obtained.
  • Inter-band carrier aggregation will be introduced in LTE-A Release 11 to achieve more flexible resource utilization.
  • Inter-band carrier aggregation interference in uplink and downlink transmission and reception is used due to the use of frequencies in different frequency bands. Smaller. However, this requires the user equipment (UE) and the base station (eNB) to have the ability to simultaneously transmit and receive.
  • UE user equipment
  • eNB base station
  • the number of uplink subframes and downlink subframes may not match, as shown by the ellipse in Figure 2a to Figure 2c.
  • Figure 2a shows the case where the downlink-to-uplink transition point of the two carriers CC1 and CC2 participating in carrier aggregation is 5 ms
  • Figure 2b shows the duration of the downlink-to-uplink transition point of the two carriers CC1 and CC2 participating in carrier aggregation being 10 ms.
  • the durations of the downlink-to-uplink transition points of the two carriers CC1 and CC2 participating in carrier aggregation are 5 ms and 10 ms, respectively.
  • TDD can send a feedback message of the Physical Downlink Shared Channel (PDSCH) only if there is an uplink subframe (PUCCH or PUSCH) because of different uplink and downlink ratios (Ack/). Nack).
  • PDSCH Physical Downlink Shared Channel
  • Ack/ uplink and downlink ratios
  • Nack uplink and downlink ratios
  • the UE will send Ack/Nack in the first uplink subframe after at least four subframes;
  • Ack/Nack is allocated in the time domain according to the principle that the number of Ack/Nacks carried in one uplink subframe is minimized.
  • one uplink subframe may need to feed back Ack/Nack of multiple downlink subframes
  • Table 2 indicates the correspondence between downlink and uplink when Ack/Nack feedback.
  • Table 2 As shown in Table 2, with configuration 1 as an example, Ack/Nack of the downlink subframes of n-7 and n-6 are fed back on the uplink subframe 2 and the subframe 7, where n is the subframe number (in this example) 2, 7), feeding back Ack/Nack of the downlink subframe of n-4 on the uplink subframe 3 and the subframe 8, where n is the subframe number (in this example, 3, 8) as shown in Fig. 3 (a) Show. For the uplink subframe 2 and the subframe 3 of the configuration 4, Ack/Nack of 4 downlink subframes needs to be fed back, as shown in FIG. 3(b).
  • uplink subframe 2 of configuration 5 it is required to feed back Ack/Nack of 9 downlink subframes (subframes n-13, n-12, n-9, n-8, n-7, n-5, n- respectively 4, n-ll, n-6).
  • This increases the delay of the Ack/Nack feedback of the downlink subframe to the base station, increases the processing time of the entire link, and puts forward higher requirements on the capacity of the physical uplink control channel (PUCCH).
  • PUCCH physical uplink control channel
  • the present invention provides an Ack/Nack feedback method for different uplink and downlink ratios of the LTE-A TDD.
  • the Ack of the downlink PDSCH fed back in the uplink subframe can be reduced by utilizing the asymmetry characteristics of the uplink subframes in different subframe ratios. /Nack maximum, reducing the delay of the Ack/Nack feedback of the downlink subframe to the eNB.
  • a feedback method for different uplink and downlink ratios of the LTE-A TDD is configured to configure different uplink and downlink ratios for different frequency bands of the time division duplex TDD, for each of the asymmetric uplink and downlink subframes of the carrier aggregation scenario,
  • the uplink subframe of the component carrier only feeds back the feedback message Ack/Nack of the downlink downlink physical channel shared channel PDSCH of the local carrier, and does not feed back the feedback message Ack/Nack of other carriers.
  • the uplink subframe when the uplink subframe is present on all the component carriers, it is determined whether the physical uplink control channel PUCCH is carried on the primary component carrier PCC. If yes, the feedback message Ack is fed back by the physical uplink control channel PUCCH carried on the primary component carrier PCC. /Nack.
  • the result of determining whether the physical uplink control channel PUCCH is carried on the primary component carrier PCC is no, the following steps are performed: selecting a physical uplink shared channel PUSCH of the secondary component carrier SCC with the smallest secondary cell index value to feed back the feedback Message Ack/Nack.
  • the secondary component carrier SCC is allowed to carry the physical uplink control channel PUCCH channel, but only one physical uplink control channel PUCCH needs to be transmitted in the corresponding subframe, if in one subframe
  • the secondary component carrier SCC with the smallest secondary cell index value is selected to transmit the physical uplink control channel PUCCH.
  • all component carriers participating in the carrier aggregation have the same downlink to uplink switching point duration.
  • Another LTE-A TDD feedback method for the uplink and downlink ratios is provided in the embodiment of the present invention, and different uplink and downlink ratios are configured for different frequency bands of the time division duplex TDD, for the asymmetric uplink and downlink subframes in the carrier aggregation scenario,
  • the feedback message Ack/Nack of the downlink subframe of the component carrier is fed back by the uplink subframe of the nearest secondary cell SCC with the smallest secondary cell index value after at least four subframes, and the feedback message Ack/Nack of multiple carriers is allowed in other Carrier transmission.
  • the uplink subframe when the uplink subframe is present on all the component carriers, it is determined whether the physical uplink control channel PUCCH is carried on the primary component carrier PCC. If yes, the feedback message Ack is fed back by the physical uplink control channel PUCCH carried on the primary component carrier PCC. /Nack.
  • the following steps are performed: selecting a physical uplink shared channel PUSCH of the secondary component carrier SCC with the smallest secondary cell index value to feed back the feedback Message Ack/Nack.
  • the secondary component carrier SCC is allowed to carry the physical uplink control channel PUCCH channel, but only one physical uplink control channel PUCCH needs to be transmitted in the corresponding subframe, if in one subframe
  • the secondary component carrier SCC with the smallest secondary cell index value is selected to transmit the physical uplink control channel PUCCH.
  • all component carriers participating in the carrier aggregation have the same downlink to uplink switching point duration.
  • an embodiment of the present invention can maintain each carrier.
  • the timing relationship of the respective independent HARQs since the Ack/Nack of some downlink subframes has been fed back in the respective uplink subframes, the total number of Ack/Nacks of feedback can be reduced when all the component carriers simultaneously appear in the uplink subframe, and different The sub-frame ratio enables the Ack/Nack to be transmitted in a distributed manner.
  • Another embodiment of the present invention may provide a shortest feedback delay of uplink control information such as Ack/Nack to the eNB, and more average the number of Ack/Nacks carried by each uplink subframe.
  • the Ack/Nack maximum value of the downlink PDSCH fed back in the uplink subframe is reduced, and the Ack/Nack of the downlink subframe is reduced to the eNB. Delay.
  • FIG. 1 is a schematic diagram of the same uplink-downlink ratio used by each component carrier in an LTE-A Rel-10 carrier aggregation scenario
  • FIG. 2a to 2c are schematic diagrams showing different uplink and downlink ratios of component carriers in an LTE-A Rel-11 carrier aggregation scenario; wherein FIG. 2a shows a case where the downlink to uplink transition point of two subcarriers participating in carrier aggregation has a duration of 5 ms.
  • 2b is a case where the downlink to uplink transition point of the two subcarriers participating in the carrier aggregation has a duration of 10 ms
  • FIG. 2c is a case where the durations of the downlink to uplink transition points of the two subcarriers participating in the carrier aggregation are 5 ms and 10 ms, respectively;
  • Figure 3 (a) and (b) show the timing relationship of the uplink subframe feedback downlink subframe Ack/Nack for uplink and downlink configuration 1 and configuration 4.
  • Figure 4 shows the different uplink-downlink ratios, allowing Ack/Nack to be fed back to the uplink subframes of other carriers after at least 4 subframes.
  • Figure 5 is a schematic diagram of SCC transmission PUCCH.
  • the Ack/Nack feedback method for different uplink and downlink ratios of the LTE-A TDD proposed by the present invention includes the following technical features:
  • the carrier in the subframe is an uplink subframe, and some carriers are downlink.
  • the uplink subframe of each component carrier only feeds back the Ack/Nack of the downlink subframe PDSCH of the local carrier, and does not feed back the Ack/Nack of other carriers.
  • the timing relationship of the feedback is according to the downlink subframe and the uplink subframe defined in Table 2. Correspondence relationship;
  • the primary component carrier PCC carries the physical uplink control channel PUCCH, and if so, the PUCCH carried by the PCC feeds back uplink control information such as Ack/Nack, SCC.
  • the Ack/Nack is not fed back; when there is no PUCCH on the PCC, the control information such as the PUSCH feedback Ack/Nack of the smallest SCC of the SCelllndex is selected.
  • This type of feedback has the advantage of implementing the single-segment, and has good backward compatibility.
  • Each carrier maintains the timing relationship of the independent HARQ. Since some Ack/Nack of the downlink subframes have feedback on their respective uplink subframes. Therefore, the total number of Ack/Nacks of feedback can be reduced when all the component carriers simultaneously appear in the uplink subframe, and this different subframe ratio enables the Ack/Nack to be dispersedly transmitted.
  • the carrier in the subframe is an uplink subframe and a carrier.
  • the Ack/Nack of the downlink subframe of each component carrier is fed back by the latest uplink subframe after at least four subframes, and the Ack/Nack of one carrier is allowed to be transmitted on other carriers, as shown in FIG. 4 .
  • the advantage of the second solution is that it can provide the shortest feedback delay of the uplink control information such as Ack/Nack to the eNB, and the average number of Ack/Nacks per uplink subframe.
  • Feature B Allows the SCC to carry the PUCCH channel, but must satisfy only one PUCCH in the corresponding subframe. If there are multiple uplinks and one or more downlink asymmetric subframes in one subframe, select SCelllndex minimum SCC transmission. PUCCH.
  • CC2 is configured as a PCC
  • only CC2 can carry the PUCCH.
  • the eNB needs to send DCI (downlink control information). If there is no uplink data transmission at this time, it will cause additional signaling overhead. . Therefore, the SCC is allowed to transmit the PUCCH channel. Even if the uplink and downlink subframes are asymmetric, there is still one PUCCH transmission in the secondary CC. In this case, the performance of the PUCCH is not affected, and the overhead of scheduling the PUSCH bearer control information is not required. .
  • Feature C Selection of different carrier ratios in carrier aggregation.
  • Option 1 Allow any combination of 0-6 in the uplink and downlink configuration in Table 1.
  • Option 2 Only allow the combination of the same ratio of the downlink to the uplink switching point. That is, only carrier aggregation of uplink and downlink ratios with a downlink to uplink switching point of 5 ms is allowed, or carrier aggregation of uplink and downlink ratios with a downlink to uplink switching point of 10 ms is allowed, and the downlink to uplink switching point is not allowed for 5 ms. 10ms hybrid carrier aggregation.
  • FIG. 3 is a schematic diagram of the method 1 for feeding back Ack/Nack in the feature A of the present invention.
  • the component carriers participating in carrier aggregation have a component carrier 1 (CC1) and a component carrier 2 (CC2), where CC1 adopts configuration 1 shown in Table 1.
  • CC2 uses configuration 4 shown in Table 1.
  • the Ack/Nack of the downlink subframe of CC1 is fed back in the uplink subframe of CC1
  • the Ack/Nack of the downlink subframe of CC2 is fed back in the uplink subframe of CC2 (the timing of the first uplink subframe after satisfying at least four subframes) Relationship).
  • Ack/Nack is transmitted on the PUCCH of the PCC or on the PUSCH of the SCC having the SCelllndex minimum.
  • Fig. 4 shows the case where the scheme 2 in the feature A of the present invention feeds back Ack/Nack.
  • the Ack/Nack of other CCs can be fed back.
  • subframe 2 3 of CC1, that is, when multiple carriers simultaneously present uplink subframes, Ack/Nack is transmitted on the PUCCH of the PCC or on the PUSCH of the SCC having the SCelllndex minimum.
  • the SCC is allowed to carry the PUCCH channel if only one PUCCH is transmitted in the corresponding subframe.
  • Figure 4 if CC2 is set to PCC and CC1 is SCC, the subframes 7, 8 of CC1 are allowed to transmit PUCCH.
  • CC5 is a carrier aggregation of five different uplink and downlink ratios according to the case of feedback Ack/Nack according to feature B.
  • CC4 is configured as PCC (SCelllndex is 0)
  • SCelllndex of CC1, CC2, CC3, and CC5 are respectively 1. 2, 3, 4.
  • the SCC is allowed to transmit the PUCCH.
  • Figure 2 (a) and (b) can be regarded as an embodiment of the second scheme in the feature C of the present invention, that is, only carrier with the same duration from the downlink to the uplink switching point is allowed in the carrier aggregation, and carrier aggregation of any uplink and downlink ratio is not allowed.

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Abstract

本发明提供了一种LTE-A TDD不同上下行配比的反馈方法,对于载波聚合场景的非对称上下行子帧,每个成员载波的上行子帧只反馈本载波的下行子帧PDSCH的Ack/Nack,不反馈其他载波的Ack/Nack。本发明还提出另一种LTE-A TDD不同上下行配比的反馈方法,对于载波聚合场景的非对称上下行子帧,每个成员载波的下行子帧的Ack/Nack由至少四个子帧后的最近的具有最小辅小区索引值的辅小区的上行子帧反馈,允许多个载波的Ack/Nack在其他载波传输。本发明利用不同子帧配比时上行子帧的不对称的特性,可以降低上行子帧中反馈的下行子帧PDSCH的Ack/Nack最大值,减少下行子帧的Ack/Nack反馈到eNB的时延。

Description

LTE-A TDD不同上下行配比的反馈方法 本申请要求于 2011 年 8 月 15 日提交中国专利局、 申请号为 201110232744.2、发明名称为 "LTE- A TDD 不同上下行配比的反馈方法"的中国 专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及无线通信技术, 尤其涉及 LTE-A时分双工 (TDD ) 不同上下 行配比的反馈方法。 背景技术
在 LTE-A ReleaselO ( Rel-10 ) 中, 引入载波聚合概念以支持更宽带宽, 即两个或更多载波被聚合在一起, 以支持 LTE-A传输带宽大于 20 MHz。 对于 Rel-10 的载波聚合的时分双工 (TDD )场景, 只支持频段内 ( intra-band ) 场 景, 该频段(band )是国际电信联盟确定的可使用的无线频谱资源。 在这种情 况下, 如果采用不同的上下行配比会使上行与下行在收发时产生严重的干扰, 因此聚合的各载波必须采用相同的 TDD上下行配比。 如图 1所示为 Rel-10载 波聚合场景使用相同的上下行配比的示意图。 其中 CC1至 CC5为参与载波聚 合的各个载波, D表示载波的下行子帧, U表示载波的上行子帧, S表示特殊 子帧 (每个载波可配置不同的特殊子帧) 。 上下行子帧比例如表 1所示。
Figure imgf000003_0001
表 1 表 1中共列出配置 0到配置 6这七种上行 -下行配置,其中配置 0在子帧 0、 5为下行, 子帧 2、 3、 4、 7、 8、 9为上行, 因此上下行配比为 3: 1 (未计 2 个特殊子帧) 。 根据表 1可以得出其他配置的上下行配比。
在 LTE- A Release 11中将引入频段间 ( inter-band )载波聚合, 以达到更灵 活的资源利用, 同时对于 inter-band载波聚合, 由于使用不同频段的频率, 因 此上行与下行收发时的干扰较小。 但这需要用户设备(UE ) 与基站 (eNB ) 具有同时收发的能力。 在 Rel-11 载波聚合中, 当不同频段使用不同的上下行 配比时, 可能会出现上行子帧与下行子帧数量不匹配的情况, 如图 2a至图 2c 中橢圓圏标示。其中图 2a为参与载波聚合的两个载波 CC1和 CC2的下行到上 行转换点的时长为 5ms的情况,图 2b为参与载波聚合的两个载波 CC1和 CC2 的下行到上行转换点的时长为 10ms的情况,图 2c为参与载波聚合的两个载波 CC1和 CC2的下行到上行转换点的时长分别为 5ms和 10ms的情况。
在 Rel-8/9/lO中, TDD由于有不同的上下行配比,只有在有上行子帧的情 况下 (PUCCH或 PUSCH ) , 才能发送物理下行共享信道(PDSCH ) 的反馈 消息 (Ack/Nack ) 。 混合自动重传请求( HARQ )设计基于两个原则:
1 , UE将在至少四个子帧后第一个上行子帧发送 Ack/Nack;
2,根据一个上行子帧中承载的 Ack/Nack数量最小化的原则,在时域分配 Ack/Nack。
根据上述原则,对某些重负载业务, 一个上行子帧可能需要反馈多个下行 子帧的 Ack/Nack , 表 2表示为 Ack/Nack反馈时下行与上行的对应关系。
Figure imgf000004_0001
表 2 从表 2中可以看出, 以配置 1为例, 在上行子帧 2和子帧 7上反馈 n-7和 n-6的下行子帧的 Ack/Nack, 其中 n为子帧号 (本例中为 2、 7 ) , 在上行子 帧 3和子帧 8上反馈 n-4的下行子帧的 Ack/Nack, 其中 n为子帧号 (本例中 为 3、 8 )如图 3 ( a )所示。 对于配置 4的上行子帧 2、 子帧 3, 分别需要反馈 4个下行子帧的 Ack/Nack, 如图 3 ( b )所示。 对于配置 5的上行子帧 2需要 反馈 9个下行子帧的 Ack/Nack (分别为子帧 n-13、 n-12、 n-9、 n-8、 n-7、 n-5、 n-4、 n-ll、 n-6 )。 这增加了下行子帧的 Ack/Nack反馈到达基站的延时, 增加 了整个链路的处理时间, 同时对物理上行控制信道( PUCCH ) 的容量提出了 更高的要求。
在 Rel-10中, 当采用载波聚合时, 只有主成员载波 (PCC )上允许 PUCCH 传输, 辅成员载波(SCC ) 不承载 PUCCH; 并且在没有 PUCCH时, 只有具 有最小的辅小区索引 (SCelllndex )值的载波的 PUSCH允许^载上行控制信 息 (UCI ) 。 当采用 4: 1的上下行配比时, 5个成员载波(CC ) 最多需要反 馈 40比特的 Ack/Nack信息,由于 Rel-10中定义的带信道选择的 PUCCH格式 lb和 PUCCH格式 3分别支持最多 4bits和 20bits的 Ack/Nack,因此对于 TDD 场景有时需要对码字进行空间绑定, 并且某些情况需要对子帧进行时间绑定。 这影响了 TDD系统的吞吐量性能, 增加了 TDD系统设计的复杂度。 发明内容
本发明提供了一种 LTE-A TDD不同上下行配比的 Ack/Nack反馈方法, 利用不同子帧配比时上行子帧的不对称的特性,可以降低上行子帧中反馈的下 行 PDSCH的 Ack/Nack最大值, 减少下行子帧的 Ack/Nack反馈到 eNB的时 延。
本发明实施例提出的一种 LTE-A TDD不同上下行配比的反馈方法, 为时 分双工 TDD不同频段配置不同的上下行配比, 对于载波聚合场景的非对称上 下行子帧,每个成员载波的上行子帧只反馈本载波的下行子帧物理下行共享信 道 PDSCH的反馈消息 Ack/Nack, 不反馈其他载波的反馈消息 Ack/Nack。
较佳地, 在所有成员载波同时出现上行子帧时, 判断主成员载波 PCC上 是否承载物理上行控制信道 PUCCH, 若是, 由主成员载波 PCC上承载的物理 上行控制信道 PUCCH反馈所述反馈消息 Ack/Nack。 较佳地,所述判断主成员载波 PCC上是否承载物理上行控制信道 PUCCH 的结果为否, 则执行如下步骤: 选择辅小区索引值最小的辅成员载波 SCC的 物理上行共享信道 PUSCH反馈所述反馈消息 Ack/Nack。
较佳地,对于载波聚合场景的非对称上下行子帧,允许辅成员载波 SCC承 载物理上行控制信道 PUCCH信道,但须满足在相应子帧只传输一个物理上行 控制信道 PUCCH, 如果在一个子帧有多个上行和 1个或多个下行的不对称的 子帧时, 选择辅小区索引值最小的辅成员载波 SCC 传输物理上行控制信道 PUCCH。
较佳地,参与所述载波聚合的所有成员载波具有相同的下行到上行切换点 时长。
本发明实施例提供的另一种 LTE-A TDD不同上下行配比的反馈方法, 为 时分双工 TDD不同频段配置不同的上下行配比, 对于载波聚合场景的非对称 上下行子帧, 每个成员载波的下行子帧的反馈消息 Ack/Nack由至少四个子帧 后的最近的具有辅小区索引值最小的辅小区 SCC的上行子帧反馈, 允许多个 载波的反馈消息 Ack/Nack在其他载波传输。
较佳地, 在所有成员载波同时出现上行子帧时, 判断主成员载波 PCC上 是否承载物理上行控制信道 PUCCH, 若是, 由主成员载波 PCC上承载的物理 上行控制信道 PUCCH反馈所述反馈消息 Ack/Nack。
较佳地,所述判断主成员载波 PCC上是否承载物理上行控制信道 PUCCH 的结果为否, 则执行如下步骤: 选择辅小区索引值最小的辅成员载波 SCC的 物理上行共享信道 PUSCH反馈所述反馈消息 Ack/Nack。
较佳地,对于载波聚合场景的非对称上下行子帧,允许辅成员载波 SCC承 载物理上行控制信道 PUCCH信道,但须满足在相应子帧只传输一个物理上行 控制信道 PUCCH, 如果在一个子帧有多个上行和 1个或多个下行的不对称的 子帧时, 选择辅小区索引值最小的辅成员载波 SCC 传输物理上行控制信道 PUCCH。
较佳地,参与所述载波聚合的所有成员载波具有相同的下行到上行切换点 时长。
从以上技术方案可以看出,本发明的一个实施例方案可以使每个载波维护 各自独立 HARQ的时序关系, 由于某些下行子帧的 Ack/Nack已经在各自的上 行子帧上反馈, 因此所有成员载波同时出现上行子帧时能够减少反馈的总的 Ack/Nack数量, 而不同的子帧配比能够使 Ack/Nack分散传输。 本发明的另一 实施例方案可以提供最短的 Ack/Nack等上行控制信息到 eNB的反馈时延,更 平均每个上行子帧承载 Ack/Nack的数量。 上述实施例方案均利用不同子帧配 比时上行子帧的不对称的特性, 可以降低上行子帧中反馈的下行 PDSCH 的 Ack/Nack最大值, 减少下行子帧的 Ack/Nack反馈到 eNB的时延。
附图说明
图 1为 LTE-A Rel-10载波聚合场景中各个成员载波使用相同的上下行配 比示意图;
图 2a至图 2c为 LTE-A Rel-11载波聚合场景中各个成员载波使用不同上 下行配比示意图; 其中图 2a为参与载波聚合的两个子载波的下行到上行转换 点的时长为 5ms的情况, 图 2b为参与载波聚合的两个子载波的下行到上行转 换点的时长为 10ms的情况,图 2c为参与载波聚合的两个子载波的下行到上行 转换点的时长分别为 5ms和 10ms的情况;
图 3 ( a ) 、 ( b )分别为上下行配置 1和配置 4的上行子帧反馈下行子帧 Ack/Nack的时序关系。
图 4为不同上下行配比情况,允许一个载波在至少 4个子帧后的其他的载 波的上行子帧反馈 Ack/Nack。
图 5为 SCC传输 PUCCH的示意图。
具体实施方式
本发明提出的 LTE-A TDD不同上下行配比的 Ack/Nack反馈方法包括如 下技术特征:
特征 A:对于 TDD不同频段配置不同的上下行配比时的 Ack/Nack反馈(需 要满足至少四个子帧的时序关系) , 提出两种解决方案:
方案一: 对于载波聚合场景的非对称上下行子帧, 如图 2 ( a ) 、 (b ) 、 (c ) 中 橢圓所示, 即在该子帧有的载波为上行子帧、 有的载波为下行子帧, 每个成员 载波的上行子帧只反馈本载波的下行子帧 PDSCH的 Ack/Nack,不反馈其他载 波的 Ack/Nack, 反馈的时序关系按表 2中定义的下行子帧与上行子帧的对应 关系;
在所有成员载波同时出现上行子帧时(如图 1橢圓所示), 判断主成员载 波 PCC上是否承载物理上行控制信道 PUCCH, 若是, 由 PCC承载的 PUCCH 反馈 Ack/Nack等上行控制信息, SCC不反馈 Ack/Nack;当 PCC上没有 PUCCH 时, 选择 SCelllndex最小的 SCC的 PUSCH反馈 Ack/Nack等控制信息。
这种反馈方式具有实现筒单的优点,有较好的后向兼容性,每个载波维护 各自独立 HARQ的时序关系, 由于某些下行子帧的 Ack/Nack已经在各自的上 行子帧上反馈,因此在所有成员载波同时出现上行子帧时能够减少反馈的总的 Ack/Nack数量, 这种不同的子帧配比能使 Ack/Nack分散传输。
方案二:
( 1 )对于载波聚合场景的非对称上下行子帧, 如图 2 ( a ) 、 (b ) 、 ( c ) 中橢圓所示, 即在该子帧有的载波为上行子帧、 有的载波为下行子帧, 每个成 员载波的下行子帧的 Ack/Nack由至少四个子帧后的最近的上行子帧反馈, 允 许一个载波的 Ack/Nack在其他载波传输, 如图 4所示。
( 2 )在所有成员载波同时出现上行子帧时(如图 1橢圓所示) , 判断主 成员载波 PCC上是否承载物理上行控制信道 PUCCH, 若是, 由 PCC承载的 PUCCH反馈 Ack/Nack等上行控制信息, SCC不反馈 Ack/Nack; 当 PCC上没 有 PUCCH时, 选择 SCelllndex最小的 SCC的 PUSCH反馈 Ack/Nack等控制 信息。
方案二的优点是能够提供最短的 Ack/Nack等上行控制信息到 eNB的反馈 时延, 更平均每个上行子帧承载 Ack/Nack的数量。
特征 B: 允许 SCC承载 PUCCH信道, 但须满足在相应子帧只传输一个 PUCCH, 如果在一个子帧有多个上行和 1个或多个下行的不对称的子帧, 选 择 SCelllndex最小的 SCC传输 PUCCH。
以图 2 ( a )为例, 如果 CC2配置为 PCC, 那么只有 CC2可承载 PUCCH, 对于图中橢圓所示的 CC1的上行子帧,如果要传输控制信息只能通过 PUSCH, 这需要 eNB发送 DCI (下行控制信息 ) , 如果此时没有上行数据传输, 则会 引起额外的信令开销。 因此允许 SCC传输 PUCCH信道, 即使在上下行子帧 不对称的情况,在辅 CC仍会有 1个 PUCCH传输,此时不仅不会影响 PUCCH 的性能, 而且不需要上述调度 PUSCH承载控制信息的开销。
特征 C: 载波聚合中载波不同配比的选择。
方案一: 允许表 1中上下行配置 0-6的任意组合。
方案二: 只允许下行到上行切换点时长相同的配比的组合。 即只允许下行 到上行切换点时长为 5ms 的上下行配比的载波聚合, 或者只允许下行到上行 切换点时长为 10ms的上下行配比的载波聚合, 不允许下行到上行切换点时长 5ms和 10ms的混合载波聚合。
其他多个载波不同子帧配置的解决方案均可视为上述三个特征的组合。 为使本发明技术方案的特点和技术效果更加清楚,以下通过具体实施例对 本发明方案进行详细阐述。
图 3所示为本发明特征 A中方案一反馈 Ack/Nack的情况, 参与载波聚合 的成员载波有成员载波 1 ( CC1 )和成员载波 2 ( CC2 ) , 其中 CC1采用表 1 所示配置 1 , CC2采用表 1所示配置 4。 CC1的下行子帧的 Ack/Nack在 CC1 的上行子帧反馈, CC2的下行子帧的 Ack/Nack在 CC2的上行子帧反馈 (需满 足至少四个子帧后的第一个上行子帧的时序关系) 。
( 1 )对于 CC1的子帧 7, 8只反馈 CC1的下行子帧的 PDSCH的 Ack/Nack, 不反馈 CC2的 Ack/Nack
( 2 )对于 CC1和 CC2无线帧的子帧 2, 3, 即多载波同时出现上行子帧 时, Ack/Nack在 PCC的 PUCCH上传输或在具有 SCelllndex最小值的 SCC的 PUSCH上传输。
图 4所示为本发明特征 A中的方案二反馈 Ack/Nack的情况。
对于 CC1的子帧 7,8可反馈其他 CC的 Ack/Nack。
对于 CC1的子帧 2, 3, 即多载波同时出现上行子帧时, Ack/Nack在 PCC 的 PUCCH上传输或在具有 SCelllndex最小值的 SCC的 PUSCH上传输。 对于特征 A中方案一和方案二,在相应子帧如果只传输一个 PUCCH的情 况,允许 SCC承载 PUCCH信道。对于图 4,如果 CC2定为 PCC, CC1为 SCC 时, 允许 CC1的子帧 7, 8传输 PUCCH。
图 5为依照特征 B反馈 Ack/Nack的情况, 5个不同上下行配比的载波聚 合, 如果配置 CC4为 PCC时(SCelllndex为 0 ) , 假设 CC1、 CC2、 CC3、 CC5的 SCelllndex分别为 1、 2、 3、 4。 允许 SCC传输 PUCCH, 对于橢圓中 的多个 SCC出现上行子帧时, 对于某个子帧将只允许 SCelllndex最小的一个 SCC传输 PUCCH, 例如对于子帧 3只允许 CC1传输 PUCCH, 对于子帧 4只 允许 CC3传输 PUCCH, 对于子帧 7、 8只允许 CC1传输 PUCCH。
图 2 ( a ) 、 (b )可以看作本发明特征 C中方案二的实施例, 即载波聚合 中只允许下行到上行切换点时长相同的载波,不允许任意的上下行配比的载波 聚合在一起。
以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡在本发 明的精神和原则之内, 所做的任何修改、 等同替换、 改进等, 均应包含在本发 明保护的范围之内。

Claims

权 利 要 求
1、 一种 LTE-A TDD不同上下行配比的反馈方法, 其特征在于,
为时分双工 TDD不同频段配置不同的上下行配比, 对于载波聚合场景的 非对称上下行子帧,每个成员载波的上行子帧只反馈本载波的下行子帧物理下 行共享信道 PDSCH 的反馈消息 Ack/Nack , 不反馈其他载波的反馈消息 Ack/Nack。
2、 根据权利要求 1所述的方法, 其特征在于, 该方法进一步包括: 在所 有成员载波同时出现上行子帧时,判断主成员载波 PCC上是否承载物理上行控 制信道 PUCCH , 若是, 由主成员载波 PCC上承载的物理上行控制信道 PUCCH反 馈所述反馈消息 Ack/Nack。
3、 根据权利要求 1所述的方法, 其特征在于, 所述判断主成员载波 PCC 上是否承载物理上行控制信道 PUCCH的结果为否, 则执行如下步骤: 选择辅小 区索引值最小的辅成员载波 SCC的物理上行共享信道 PUSCH反馈所述反馈消息 Ack/Nack。
4、 根据权利要求 1所述的方法, 其特征在于, 对于载波聚合场景的非对 称上下行子帧, 允许辅成员载波 SCC 承载物理上行控制信道 PUCCH信道, 但 须满足在相应子帧只传输一个物理上行控制信道 PUCCH , 如果在一个子帧有多 个上行和一个或多个下行的不对称的子帧时,选择辅小区索引值最小的辅成员 载波 SCC传输物理上行控制信道 PUCCH。
5、 根据权利要求 1至 4任一项所述的方法, 其特征在于, 参与所述载波 聚合的所有成员载波具有相同的下行到上行切换点时长。
6、 一种 LTE-A TDD不同上下行配比的反馈方法, 其特征在于,
为时分双工 TDD不同频段配置不同的上下行配比, 对于载波聚合场景的 非对称上下行子帧, 每个成员载波的下行子帧的反馈消息 Ack/Nack由至少四 个子帧后的最近的具有辅小区索引值最小的辅小区 SCC的上行子帧反馈,允许 多个载波的反馈消息 Ack/Nack在其他载波传输。
7、 根据权利要求 6所述的方法, 其特征在于, 该方法进一步包括: 在所 有成员载波同时出现上行子帧时,判断主成员载波 PCC上是否承载物理上行控 制信道 PUCCH , 若是, 由主成员载波 PCC上承载的物理上行控制信道 PUCCH反 馈所述反馈消息 Ack/Nack。
8、 根据权利要求 6所述的方法, 其特征在于, 所述判断主成员载波 PCC 上是否承载物理上行控制信道 PUCCH的结果为否, 则执行如下步骤: 选择辅小 区索引值最小的辅成员载波 SCC的物理上行共享信道 PUSCH反馈所述反馈消息 Ack/Nack。
9、 根据权利要求 6所述的方法, 其特征在于, 对于载波聚合场景的非对 称上下行子帧, 允许辅成员载波 SCC 承载物理上行控制信道 PUCCH信道, 但 须满足在相应子帧只传输一个物理上行控制信道 PUCCH , 如果在一个子帧有多 个上行和一个或多个下行的不对称的子帧时,选择辅小区索引值最小的辅成员 载波 SCC传输物理上行控制信道 PUCCH。
1 0、 根据权利要求 6至 9任一项所述的方法, 其特征在于, 参与所述载波 聚合的所有成员载波具有相同的下行到上行切换点时长。
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