WO2012068934A1 - 调整ue的上行授权物理下行控制信道的方法和基站 - Google Patents

调整ue的上行授权物理下行控制信道的方法和基站 Download PDF

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Publication number
WO2012068934A1
WO2012068934A1 PCT/CN2011/081041 CN2011081041W WO2012068934A1 WO 2012068934 A1 WO2012068934 A1 WO 2012068934A1 CN 2011081041 W CN2011081041 W CN 2011081041W WO 2012068934 A1 WO2012068934 A1 WO 2012068934A1
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Prior art keywords
physical downlink
control channel
downlink control
uplink
determining
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PCT/CN2011/081041
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English (en)
French (fr)
Inventor
姜大洁
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中国移动通信集团公司
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Priority to EP11842593.3A priority Critical patent/EP2645786B1/en
Priority to US13/988,846 priority patent/US9386564B2/en
Publication of WO2012068934A1 publication Critical patent/WO2012068934A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/48—TPC being performed in particular situations during retransmission after error or non-acknowledgment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure

Definitions

  • the present application relates to a wireless communication technology, and in particular, to a method and a base station for adjusting an Uplink Grant authorized physical downlink control channel to a User Equipment (UE) in a Long Term Evolution (LTE) system.
  • UE User Equipment
  • LTE Long Term Evolution
  • each downlink subframe includes a control region and a data region, and a total of 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols.
  • the first one to four symbols of each subframe may be used as a control area, including a physical control format indication channel (PCFICH), a physical downlink control channel (PDCCH), and a physical HARQ indicator channel (Physical Hybrid HARQ Indicator Channel). , PHICH ), Common Reference Signal (CRS) and some empty Resource Element (RE).
  • the PDCCH carries Downlink Control Information (DCI), which includes resource allocation and other control information sent to one or more User Equipments (UEs).
  • DCI Downlink Control Information
  • UEs User Equipments
  • multiple PDCCHs may be included in one subframe, and each PDCCH corresponds to a different UE.
  • Each PDCCH is spread over the entire bandwidth and the symbols of all control regions.
  • the PDCCH can adaptively occupy 1, 2, 4 or 8 Control Channel Elements (CCEs), and each CCE includes 36 REs.
  • CCEs Control Channel Elements
  • a PDCCH of a user with good channel conditions occupies 1 or 2 CCEs
  • a PDCCH of a user with a poor channel condition occupies 4 or 8 CCEs.
  • the base station according to the broadband channel quality indicator reported by the UE (Channel The Quality Indicator (CQI) is used to calculate the corresponding Signal to Interference plus Noise Ratio (SINR) value, and then the PDCCH for the UE should occupy several CCEs according to the SINR value.
  • CQI Channel The Quality Indicator
  • SINR Signal to Interference plus Noise Ratio
  • the inventors found that the prior art has at least the following defects: due to the transmission mode of the control area (such as 2 X 2 SFBC, Space Frequency Block Code) and the transmission mode of the data area i or (9 kinds)
  • the transmission mode, Transmission mode 1 to Transmission mode 9) is different, and the inter-cell interference received on the control region is different from the inter-cell interference received in the data region. Therefore, the wideband CQI reported by the UE can only reflect the channel quality of the data region. , and does not truly reflect the channel quality of the control area.
  • the transmission of the PDCCH needs to be very reliable.
  • the error rate of the PDCCH transmission should be less than 1%, and only the wideband CQI reported by the UE is used for link adaptation of the PDCCH (select 1, 2, 4 or The 8 CCE transmission PDCCHs are unstable and rough, and it is difficult to ensure that the error rate of PDCCH transmission is less than 1%.
  • the embodiment of the present application provides a method and a base station for adjusting an uplink grant physical downlink control channel of a UE, so as to implement a more accurate PDCCH link adaptation, thereby ensuring reliability of PDCCH transmission.
  • a method for adjusting an uplink grant physical downlink control channel of a UE including: receiving a physical uplink shared channel that is sent by a UE on an uplink resource indicated by a current uplink authorized physical downlink control channel; Determining, by the received physical uplink shared channel, whether the UE successfully receives the uplink authorized physical downlink control channel; and determining, according to the determination result, the number and/or number of control channel units CCE occupied by the uplink authorized physical downlink control channel The uplink grants the transmit power of the physical downlink control channel.
  • a base station for adjusting an uplink grant physical downlink control channel of a UE including: a receiving module, receiving a physical uplink sent by the UE on an uplink resource indicated by a current uplink authorized physical downlink control channel a judging module, determining, according to the physical uplink shared channel received by the receiving module, whether the UE successfully receives the uplink authorized physics a downlink control channel, and an adjustment module, configured to determine, according to the determination result of the determining module, the number of control channel unit CCEs occupied by the uplink authorized physical downlink control channel and/or the transmit power of the uplink authorized physical downlink control channel.
  • the method and the base station for adjusting the uplink authorized physical downlink control channel of the UE provided by the embodiment of the present application can adaptively adjust the number of CCEs occupied by the PDCCH, thereby ensuring the reliability of the PDCCH transmission.
  • FIG. 1 shows a method for adjusting an uplink authorized physical downlink control channel of a UE in the first embodiment of the present application
  • FIG. 2 shows a base station for adjusting an uplink grant physical downlink control channel of a UE in the embodiment of the present application. detailed description
  • the UE-specific PDCCH includes the resource allocation and other control information of the UE, and specifically includes a downlink grant (DL Grant) indicating a downlink resource allocation and a transport format, and an uplink grant indicating an uplink resource allocation and a transport format (UL Grant).
  • DL Grant downlink grant
  • UL Grant uplink grant indicating an uplink resource allocation and a transport format
  • a method 100 for adjusting an uplink grant physical downlink control channel of a UE is as shown in FIG. 1.
  • adjusting the uplink grant physical downlink control channel of the UE specifically refers to adjusting the number of CCEs occupied by the uplink authorized physical downlink control channel of the UE and/or the transmit power of the uplink authorized physical downlink control channel.
  • the base station After receiving the UL Grant to the UE, the base station receives the Physical Uplink Shared Channel (PUSCH) sent by the UE on the uplink subframe and the uplink resource block (RB) indicated by the UL Grant in step 101. ). Then, it is determined whether the UE successfully receives the UL Grant according to the reception status of the PUSCH.
  • PUSCH Physical Uplink Shared Channel
  • RB uplink resource block
  • step 102 it is determined whether the PUSCH received by the base station from the UE corresponds to the UL Grant sent by the base station to the UE, that is, whether the PUSCH received by the base station from the UE is successfully received; for example, by performing a cyclic redundancy code on the PUSCH (Cyclic Redundancy) Check, CRC) Bit check to determine if the reception was successful. If the result of the CRC bit check is a match, it means that the UE successfully received the UL Grant. For the sake of convenience, the case where the UE successfully receives the UL Grant is recorded as the PDCCH ACK, and the case where the UE fails to receive the UL Grant successfully is recorded as the PDCCH NACK.
  • a cyclic redundancy code on the PUSCH (Cyclic Redundancy) Check, CRC) Bit check to determine if the reception was successful. If the result of the CRC bit check is a match, it means that the UE successfully received the UL Grant.
  • the current SINR of the UE is increased in step 103, and the number of CCEs occupied by the UL Grant sent to the UE next time is determined according to the increased SINR. Specifically, a positive correction value is added to the current SINR value, and then the number of CCEs occupied by the UL Grant sent to the UE is determined according to the modified SINR. It can be understood that, in this case, the number of CCEs determined according to the modified SINR will be equal to or less than the number of CCEs occupied by the UL Grant of the UE.
  • the current SINR value is indicated by the most recent Wideband Channel Quality Indicator (CQI) reported by the UE.
  • CQI Wideband Channel Quality Indicator
  • the base station first obtains the latest UE-to-base station path loss value by using the power headroom reported by the UE, and then obtains the current SINR value according to the path loss value mapping.
  • a mapping table of path loss values and SINRs may be stored in the base station side in advance, and a SINR value corresponding to a path loss value may be obtained by looking up a table.
  • the base station can update the table according to the actual situation.
  • the current SINR value is the SINR of the PDCCH that was last sent to the UE.
  • the SINR of the PDCCH that the base station sends to the UE for the first time may be set to an initial value (for example, set to a demodulation threshold of the 2CCE PDCCH), or may be set according to the wideband CQI reported by the UE.
  • step 102 When it is confirmed in step 102 that the PUSCH is not successfully received, for example, the result of performing cyclic redundancy code (CRC) bit check on the PUSCH is a mismatch.
  • CRC cyclic redundancy code
  • the base station measures the Received Signal Strength Indicator (RSI) of the UE on the uplink subframe and the uplink RB indicated by the UL Grant, and compares the measured RSSI value with a preset threshold. Values are compared.
  • RSI Received Signal Strength Indicator
  • step 105 the number of CCEs occupied by the UL Grant sent to the UE next time is determined according to the increased SINR.
  • the operation of step 105 is substantially the same as step 103.
  • the current SINR of the UE is reduced in step 106, and the number of CCEs occupied by the UL Grant sent to the UE next time is determined according to the reduced SINR. Specifically, a negative correction value is added to the current SINR value, and then the number of CCEs occupied by the UL Grant sent to the UE is determined according to the corrected SINR. It can be understood that, in this case, the number of CCEs determined according to the modified SINR will be equal to or greater than the number of CCEs previously occupied by the UL Grant of the UE.
  • the RSSI threshold value in the foregoing embodiment may be set, for example, according to the RSSI on the corresponding RB measured by the base station in the corresponding uplink subframe and the uplink RB without the PUSCH transmission.
  • the UL Grant and its corresponding PUSCH in the foregoing embodiments may include a dynamically scheduled UL Grant and its corresponding PUSCH, and an uplink semi-persistent scheduling activation signaling and a semi-persistent scheduling activation signaling allocation of the first PUSCH.
  • the non-first PUSCH of the uplink semi-persistent scheduling activation signaling and the semi-persistent scheduling activation signaling allocation is not within the scope of this application.
  • the positive correction value and the negative correction value in the above embodiment may be set according to a PDCCH block error rate (PDCCH BLER) target value.
  • PDCCH BLER target value can be set to 1%.
  • increasing or decreasing the SINR is not one.
  • the number of CCEs occupied by the UL Grant is reduced or increased, and it is possible to maintain the current number of CCEs.
  • the number of CCEs occupied by the UL Grant is reduced or increased only when the SINR is increased or decreased to a certain extent (ie, corresponding to the degree to which the number of CCEs needs to be adjusted).
  • the transmit power of the uplink authorized physical downlink control channel may be performed. Adjusting, that is, adjusting the transmit power of the uplink authorized physical downlink control channel that is sent to the UE next time. Specifically, as described above, when it is determined that the UE successfully receives the UL Grant, the current SINR of the UE may be increased; if it is determined that the UE does not successfully receive the UL Grant, the current UE may be reduced. SINR. Based on the corrected SINR, the transmit power of the UL Grant sent to the UE next time can be determined.
  • the transmission power of the UL Grant can be reduced accordingly.
  • the transmission power of the UL Grant may be increased accordingly.
  • FIG. 2 illustrates a base station 300 for adjusting a UL Grant of a UE in accordance with the present application.
  • the base station 300 includes a receiving module 301, and receives a PUSCH that is sent by the UE on the uplink resource indicated by the current UL Grant.
  • the determining module 302 determines, according to the PUSCH received by the receiving module 301, whether the UE successfully receives the UL Grant.
  • the adjusting module 303 determining the number of CCEs occupied by the UL Grant according to the judgment result of the determining module 302, that is, determining the number of control channel units CCE occupied by the uplink authorized physical downlink control channel.
  • the determining module 302 may perform a CRC bit check on the PUSCH received by the receiving module 301 to determine whether the UE successfully receives the UL Grant sent by the base station. If the result of the CRC bit check performed by the decision module 302 is a match, it is determined that the UE successfully received the UL Grant.
  • the decision module 302 includes a determination unit, a measurement unit, and a comparison unit (all shown).
  • the judging unit performs the above-described CRC bit check.
  • the measuring unit measures the received signal strength of the UE on the UL Grant
  • the comparing unit compares the received signal strength with a predetermined threshold value. If the received signal strength is higher than the predetermined The threshold value determines that the UE successfully receives the UL Grant; if the received signal strength is lower than the predetermined threshold, it is determined that the UE does not successfully receive the UL Grant.
  • the adjusting unit 303 increases the current SINR of the UE, and determines the number of CCEs occupied by the UL Grant according to the increased SINR. In the case that the determining module 302 determines that the UE does not successfully receive the UL Grant, the adjusting unit 303 reduces the current SINR of the UE, and determines the number of CCEs occupied by the UL Grant according to the reduced SINR.
  • the current SINR value may be indicated by the most recent Wideband Channel Quality Indicator (CQI) reported by the UE.
  • the base station first obtains the latest UE-to-base station path loss value by using the ower headroom reported by the UE, and then obtains the current SINR value according to the path loss value mapping.
  • a mapping table of path loss values and SINRs may be stored in the base station side in advance, and a SINR value corresponding to a path loss value may be obtained by looking up a table. The base station can update the table according to the actual situation.
  • the current SINR value is the SINR of the PDCCH that was last sent to the UE.
  • the SINR of the PDCCH that the base station sends to the UE for the first time may be set to an initial value (for example, set to a demodulation threshold of the 2CCE PDCCH), or may be set according to the wideband CQI reported by the UE.
  • the RSSI threshold value in the above embodiment may be set, for example, according to the RSSI on the corresponding RB measured by the base station when the UE does not transmit the PUSCH.
  • the UL Grant and its corresponding PUSCH in the foregoing embodiments may include a dynamically scheduled UL Grant and its corresponding PUSCH, and an uplink semi-persistent scheduling activation signaling and a semi-persistent scheduling activation signaling allocation of the first PUSCH.
  • the non-first PUSCH of the uplink semi-persistent scheduling activation signaling and the semi-persistent scheduling activation signaling allocation is not within the scope of this application.
  • the positive correction value and the negative correction value in the above embodiment may be set according to the PDCCH BLER target value.
  • the PDCCH BLER target value can be set to 1%. It should be understood that, in the foregoing steps, increasing or decreasing the SINR does not necessarily reduce or increase the number of CCEs occupied by the UL Grant, but may still maintain the current number of CCEs. The number of CCEs occupied by the UL Grant is reduced or increased only when the SINR is increased or decreased to a certain extent (ie, corresponding to the degree to which the number of CCEs needs to be adjusted).
  • the adjusting module 303 may send the next time to the UE.
  • the uplink grants the transmit power of the physical downlink control channel to be adjusted.
  • the adjusting module 303 may increase the SINR of the UE and may reduce the transmit power of the UL Grant accordingly; the determining module 302 determines In the case that the UE does not successfully receive the UL Grant, the adjustment module 303 may reduce the SINR of the UE and may increase the transmission power of the UL Grant accordingly.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

调整 UE的上行授权物理下行控制信道的方法和基站 本申请要求在 2010年 11月 24日提交中国专利局、 申请号为 201010557136.4、 发明名称为
"调整 UE的上行授权物理下行控制信道的方法和基站"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
本申请涉及无线通信技术， 具体地， 涉及在长期演进 ( Long Term Evolution, LTE )系统中调整发给用户设备（ User Equipment, UE )的上行（ Uplink Grant )授权物理下行控制信道的方法和基站。 背景技术
在 3GPP LTE Release 8、 Release 9和 Release 10规范中， 每个下行子帧 ( subframe ) 包括控制区域与数据区域， 共 14 个正交频分复用 （Orthogonal Frequency Division Multiplexing, OFDM )符号。 其中， 每个子帧的前 1到 4 个符号可以作为控制区域， 包括物理控制格式指示信道（PCFICH )、 物理下 行控制信道 ( Physical Downlink Control Channel, PDCCH )、 物理 HARQ指示 信道（Physical Hybrid HARQ Indicator Channel , PHICH )、 公共参考信号 ( Common Reference Signal, CRS )和一些空的资源粒子 ( Resource Element, RE )。 PDCCH中承载下行控制信息 （Downlink Control Information, DCI ), 包括发给一个或多个用户设备 ( User Equipment, UE )的资源分配和其他控制 信息。 一般来说， 一个子帧内可以包括多个 PDCCH, 每个 PDCCH对应不同 的 UE。
每个 PDCCH分散在整个带宽和全部的控制区域的符号上。根据用户的信 道条件， PDCCH可以自适应地占用 1 、 2、 4或者 8个控制信道单元（ Control Channel Element, CCE ), 每个 CCE包括 36个 RE。 例如， 信道条件好的用户 的 PDCCH占用 1个或者 2个 CCE,信道条件差一些的用户的 PDCCH占用 4 或者 8个 CCE。 具体地， 基站根据 UE上报的宽带信道质量指示符（Channel Quality Indicator , CQI ) 来折算出相应的信号与干扰加噪声比 （ Signal to Interference plus Noise Ratio, SINR )值， 然后根据该 SINR值来计算出给该 UE的 PDCCH应该占用几个 CCE。
然而， 发明人在实现本申请的过程中， 发现现有技术至少存在以下缺陷： 由于控制区域的传输模式（如 2 X 2 SFBC, Space Frequency Block Code ) 与数据区 i或的传输模式 ( 9种传输模式, Transmission mode 1到 Transmission mode 9 ) 不一样， 而且控制区域上受到的小区间干扰与数据区域上受到的小 区间干扰也不一样， 因此 UE上报的宽带 CQI仅能反映数据区域的信道质量， 而并不能真实反映控制区域的信道质量。 此外， PDCCH的传输需要很可靠才 行， 比如一般来讲， PDCCH传输的出错率应该小于 1%, 而仅仅靠 UE上报 的宽带 CQI来进行 PDCCH的链路自适应 （选择 1、 2、 4或者 8个 CCE传输 PDCCH )是不稳定且比较粗糙的做法， 很难保证 PDCCH传输的出错率小于 1%。 发明内容
本申请实施例提供了一种调整 UE 的上行授权物理下行控制信道的方法 和基站， 以实现更精确的 PDCCH链路自适应， 从而保证 PDCCH传输的可靠性。
根据本申请的一个方面， 提出了一种调整 UE的上行授权物理下行控制信 道的方法， 包括： 接收 UE在当前的上行授权物理下行控制信道所指示的上行 资源上发送的物理上行共享信道； 根据接收到的物理上行共享信道， 判断所 述 UE是否成功接收了所述上行授权物理下行控制信道； 以及根据判断结果， 确定所述上行授权物理下行控制信道占用的控制信道单元 CCE数量和 /或所述 上行授权物理下行控制信道的发射功率。
根据本申请的另一方面， 提出了一种调整 UE的上行授权物理下行控制信 道的基站， 包括： 接收模块， 接收 UE在当前的上行授权物理下行控制信道所 指示的上行资源上发送的物理上行共享信道； 判断模块， 根据所述接收模块 接收到的物理上行共享信道， 判断所述 UE是否成功接收了所述上行授权物理 下行控制信道； 以及调整模块， 根据所述判断模块的判断结果确定所述上行 授权物理下行控制信道占用的控制信道单元 CCE数量和 /或所述上行授权物理 下行控制信道的发射功率。
本申请实施例提供的调整 UE 的上行授权物理下行控制信道的方法和基 站， 可以自适应地调整 PDCCH所占用的 CCE数量， 从而保证 PDCCH传输的可 靠性。 附图说明
图 1示出本申请第一实施方式中用于调整 UE的上行授权物理下行控制信 道的方法；
图 2示出本申请实施例中用于调整 UE的上行授权物理下行控制信道的基 站。 具体实施方式
下文将参照附图结合示例性的具体实施方式描述本申请。
如上文所述， UE专用的 PDCCH中包括了该 UE的资源分配和其他控制 信息， 具体包括指示下行资源分配和传输格式的下行授权（DL Grant )和指示 上行资源分配和传输格式的上行授权（UL Grant )。 本申请提出了更精确地进 行 UL Grant的链路自适应的方案。
根据本申请的实施方式，用于调整 UE的上行授权物理下行控制信道的方 法 100如图 1所示。本文中，调整 UE的上行授权物理下行控制信道具体指调 整 UE的上行授权物理下行控制信道所占用的 CCE数目和 /或所述上行授权物 理下行控制信道的发射功率。
首先， 基站在向 UE发送 UL Grant之后， 在步骤 101 , 在 UL Grant指示 的上行子帧和上行资源块（ Resource Block, RB )上接收该 UE发送的物理上 行共享信道（ Physical Uplink Shared Channel, PUSCH )。 然后， 根据 PUSCH的接收情况判断 UE是否成功接收了 UL Grant。
具体地， 在步骤 102, 确定基站从 UE接收的 PUSCH与基站发送给 UE 的 UL Grant是否对应，即确定基站从 UE接收的 PUSCH是否接收成功；例如， 通过对 PUSCH执行循环冗余码 ( Cyclic Redundancy Check, CRC ) 比特校验 以确定是否接收成功。 如果 CRC比特校验的结果为匹配， 则代表该 UE成功 接收了 UL Grant。 为了方便起见， 本文中将 UE成功接收 UL Grant的情况记 为 PDCCH ACK,而将 UE未能成功接收 UL Grant的情况记为 PDCCH NACK。
这样， 当在步骤 102确认 PUSCH接收成功时， 在步骤 103增大 UE当前 的 SINR,并根据增大的 SINR确定下一次发给该 UE的 UL Grant所占用的 CCE 数目。 具体地， 在当前的 SINR值上加上一个正的修正值， 然后根据修正后的 SINR确定发给该 UE的 UL Grant占用的 CCE数目。 可以理解， 在这种情况 下， 根据修正后的 SINR确定的 CCE数目将等于或小于该 UE的 UL Grant先 前所占用 CCE数目。
在一个实施例中， 当前的 SINR值由 UE上报的最新的宽带信道质量指示 符 ( CQI )指示。
在另一实施例中， 基站首先通过 UE 上报的功率上升空间 （power headroom )得到最新的 UE到基站的路径损耗值， 然后根据该路径损耗值映射 得到当前的 SINR值。 在这种情况下， 例如， 可预先在基站端存储一个路径损 耗值与 SINR的映射表， 通过查表得到某个路径损耗值对应的 SINR值。 基站 对该表可以根据实际情况进行更新。
在又一实施例中，当前的 SINR值为最近一次发给 UE的 PDCCH的 SINR。 在这种情况下， 基站首次发给该 UE的 PDCCH的 SINR可以设定为一个初始 值（例如设置为 2CCE PDCCH的解调门限 ),或者可根据 UE上报的宽带 CQI 而设定。
当在步骤 102确认 PUSCH没有接收成功时， 例如， 对 PUSCH执行循环 冗余码 ( CRC )比特校验的结果为不匹配。 这时可能存在两种情况， 一是 UE 未能成功接收到 UL Grant,二是 UE成功接收到 UL Grant但基站接收 PUSCH 时出错。 因此， 在确认 PUSCH没有成功接收时， 需进一步确定其不匹配的原 因是属于以上的哪一种情况。
为此， 在步骤 104, 基站在 UL Grant指示的上行子帧和上行 RB上测量 UE的接收信号强度指示 （Received Signal Strength Indicator, RSSI ), 并将测 得的 RSSI值与预先设定的门限值进行比较。
如果确定基站在该上行子帧和该上行 RB上测量到的 RSSI高于预定的门 限值， 则代表 UE已成功接收 UL Grant (记为 PDCCH ACK )。 此时， 在步骤 105增大 UE当前的 SINR, 并根据增大的 SINR确定下一次发给该 UE的 UL Grant所占用的 CCE数目。 步骤 105的操作与步骤 103基本相同。
如果确定基站在该上行子帧和该上行 RB上测量到的 RSSI低于预定的门 限值， 则代表该 UE没有成功接收 UL Grant (记为 PDCCH NACK )。 此时， 在步骤 106减小 UE当前的 SINR,并根据减小的 SINR确定下一次发给该 UE 的 UL Grant所占用的 CCE数目。 具体地， 在当前的 SINR值上加上一个负的 修正值， 然后根据修正后的 SINR确定发给该 UE的 UL Grant占用的 CCE数 目。 可以理解， 在这种情况下， 根据修正后的 SINR确定的 CCE数目将等于 或大于该 UE的 UL Grant先前所占用 CCE数目。
尽管在图 1中没有示出， 但可以理解， 对于 RSSI等于门限值的情况， 可 保持当前的 CCE数目， 而无需进行修正。
上述实施方式中的 RSSI门限值例如可以根据本小区在相应的上行子帧和 该上行 RB没有 PUSCH发送时基站测量的相应 RB上的 RSSI而设定。
上述实施方式中的 UL Grant及其对应的 PUSCH可包括动态调度的 UL Grant以及其对应的 PUSCH, 和上行半持续调度的激活信令及半持续调度的 激活信令分配的第一个 PUSCH。 上行半持续调度的激活信令及半持续调度的 激活信令分配的非第一个 PUSCH不在本申请涉及的范畴。
上述实施方式中的正修正值和负修正值可根据 PDCCH 块误码率 ( PDCCH Block Error Rate, PDCCH BLER )目标值而设定。例如，可将 PDCCH BLER目标值设为 1%。 应当理解， 在上述步骤中， 增大或减小 SINR并不一 定会相应地使 UL Grant占用的 CCE数目减小或增大，而是有可能仍然维持当 前的 CCE数目不变。 只有当 SINR增大或减小到一定程度（即， 对应于需要 调整 CCE数目的程度） 时， 才会使 UL Grant占用的 CCE数目减小或增大。
作为一种选择或补充，在本申请的一个实施方式中，在判断出所述 UE是 否成功接收了所述上行授权物理下行控制信道之后， 可对所述上行授权物理 下行控制信道的发射功率进行调整， 即调整下一次发送给该 UE的所述上行授 权物理下行控制信道的发射功率。 具体地， 如上文所述， 在判断出 UE成功接 收了 UL Grant的情况下， 可增大该 UE当前的 SINR; 在判断出 UE未成功接 收 UL Grant的情况下， 可减小该 UE当前的 SINR。 根据修正后的 SINR, 可 确定下一次发送给该 UE的 UL Grant的发射功率。对于 SINR增大的情况，即， UE成功接收了 UL Grant, 可相应地减小 UL Grant的发射功率。对于 SINR减 小的情况， 即， UE未成功接收 UL Grant, 可相应地增大 UL Grant的发射功 率。
图 2示出了根据本申请用于一种调整 UE的 UL Grant的基站 300。如图所 示，基站 300包括接收模块 301 ,接收 UE在当前的 UL Grant所指示的上行资 源上发送的 PUSCH; 判断模块 302, 根据接收模块 301接收到的 PUSCH, 判 断 UE是否成功接收了 UL Grant; 以及调整模块 303 , 根据判断模块 302的判 断结果确定 UL Grant占用的 CCE数量，即确定上行授权物理下行控制信道占 用的控制信道单元 CCE数量。
在一个实施方式中，判断模块 302可对接收模块 301接收的 PUSCH执行 CRC比特校验， 以确定 UE是否成功接收了基站发送的 UL Grant。 如果判断 模块 302执行的 CRC 比特校验的结果为匹配， 则判定 UE成功接收了 UL Grant„
在一个实施方式中， 判断模块 302 包括判断单元、 测量单元和比较单元 (均为示出）。 判断单元执行上述的 CRC比特校验。 在 CRC比特匹配的结果 为不匹配的情况下， 测量单元测量 UE在 UL Grant上的接收信号强度， 比较 单元将该接收信号强度与预定的门限值进行比较。 若接收信号强度高于预定 的门限值，则判定 UE成功接收了 UL Grant;若所述接收信号强度低于预定的 门限值， 则判定 UE没有成功接收 UL Grant。
在判断模块 302判定 UE成功接收了 UL Grant的情况下， 调整单元 303 增大 UE当前的 SINR, 并根据增大的 SINR确定 UL Grant占用的 CCE数目。 在判断模块 302判定 UE没有成功接收 UL Grant的情况下， 调整单元 303减 小 UE当前的 SINR, 并根据减小的 SINR确定 UL Grant占用的 CCE数目。
在一个实施例中， 当前的 SINR值可由 UE上报的最新的宽带信道质量指 示符（CQI )指示。 在另一实施例中， 基站首先通过 UE上报的功率上升空间 ( ower headroom )得到最新的 UE到基站的路径损耗值， 然后根据该路径损 耗值映射得到当前的 SINR值。 在这种情况下， 例如， 可预先在基站端存储一 个路径损耗值与 SINR的映射表， 通过查表得到某个路径损耗值对应的 SINR 值。 基站对该表可以根据实际情况进行更新。 在又一实施例中， 当前的 SINR 值为最近一次发给 UE的 PDCCH的 SINR。 在这种情况下， 基站首次发给该 UE的 PDCCH的 SINR可以设定为一个初始值（例如设置为 2CCE PDCCH的 解调门限）， 或者可根据 UE上报的宽带 CQI而设定。
上述实施方式中的 RSSI门限值例如可以根据本小区没有 PUSCH发送时 基站测量的相应 RB上的 RSSI而设定。
上述实施方式中的 UL Grant及其对应的 PUSCH可包括动态调度的 UL Grant以及其对应的 PUSCH, 和上行半持续调度的激活信令及半持续调度的 激活信令分配的第一个 PUSCH。 上行半持续调度的激活信令及半持续调度的 激活信令分配的非第一个 PUSCH不在本申请涉及的范畴。
上述实施方式中的正修正值和负修正值可根据 PDCCH BLER目标值而设 定。 例如， 可将 PDCCH BLER目标值设为 1%。 应当理解， 在上述步骤中， 增大或减小 SINR并不一定会相应地使 UL Grant占用的 CCE数目减小或增大， 而是有可能仍然维持当前的 CCE数目不变。 只有当 SINR增大或减小到一定 程度（即， 对应于需要调整 CCE数目的程度） 时， 才会使 UL Grant占用的 CCE数目减小或增大。 作为一种选择或补充， 在本申请的一个实施方式中， 在判断模块 302判 断出所述 UE是否成功接收了所述上行授权物理下行控制信道之后，调整模块 303可对下一次发送给该 UE的所述上行授权物理下行控制信道的发射功率进 行调整。具体地，如上文所述，在判断模块 302判断出 UE成功接收了 UL Grant 的情况下， 调整模块 303可增大 UE的 SINR并可相应减小 UL Grant的发射 功率； 在判断模块 302判断出 UE未成功接收 UL Grant的情况下， 调整模块 303可减小 UE的 SINR并可相应增大 UL Grant的发射功率。
以上参照附图结合示例性实施方式对本申请的方案进行了说明。 可以理 解， 上述的实施方式并不应视为对本申请范围的限定。 在不偏离本申请的精 形和 /或组合。

Claims

权 利 要 求
1. 一种调整用户设备 UE的上行授权物理下行控制信道的方法， 包括： 接收 UE在当前的上行授权物理下行控制信道所指示的上行资源上发送的 物理上行共享信道；
根据接收到的物理上行共享信道， 判断所述 UE是否成功接收了所述上行 授权物理下行控制信道； 以及
根据判断结果， 确定所述上行授权物理下行控制信道占用的控制信道单 元 CCE数量和 /或所述上行授权物理下行控制信道的发射功率。
2. 如权利要求 1所述的方法， 其中， 所述判断包括对所述物理上行共享 信道上接收到的数据执行循环冗余码 CRC比特校验， 以确定所述 UE是否成功 接收了所述上行授权物理下行控制信道。
3. 如权利要求 2所述的方法， 其中， 如果所述 CRC比特校验的结果为匹 配， 则判定所述 UE成功接收了所述上行授权物理下行控制信道。
4. 如权利要求 2所述的方法， 其中， 如果所述 CRC比特校验的结果为不 匹配， 所述判断则进一步包括：
测量所述 UE在所述上行授权物理下行控制信道指示的物理上行共享信道 资源上的接收信号强度；
将所述接收信号强度与预定的门限值进行比较；
若所述接收信号强度高于预定的门限值， 则判定所述 UE成功接收了所述 上行授权物理下行控制信道； 以及
若所述接收信号强度低于预定的门限值， 则判定所述 UE没有成功接收所 述上行授权物理下行控制信道。
5. 如权利要求 1所述的方法， 其中， 在所述判断结果为所述 UE成功接 收了所述上行授权物理下行信道的情况下， 所述确定包括：
增大所述 UE当前的信号与干扰加噪声比 S INR; 以及
根据增大的 S INR确定下一次发送给该 UE的所述上行授权物理下行控制 信道占用的 CCE数目和 /或下一次发送给该 UE的所述上行授权物理下行控制 信道的发射功率。
6. 如权利要求 1所述的方法， 其中， 在所述判断结果为所述 UE没有成 功接收所述上行授权物理下行信道的情况下， 所述确定包括：
减小所述 UE当前的 S INR; 以及
根据减小的 SINR确定下一次发送给该 UE的所述上行授权物理下行控制 信道占用的 CCE数目和 /或下一次发送给该 UE的所述上行授权物理下行控制 信道的发射功率。
7. 如权利要求 5或 6所述的方法， 其中， 所述当前的 SINR由所述 UE上 报的宽带信道质量指示 CQI指示。
8. 如权利要求 5或 6所述的方法， 其中， 所述当前的 SINR由所述 UE的 路径损耗值映射得到， 所述路径损耗值通过所述 UE上报的功率上升空间值确 定。
9. 如权利要求 5或 6所述的方法， 其中， 所述当前的 SINR是最近发给 所述 UE的上行授权物理下行控制信道的 SINR。
10. 如权利要求 5或 6所述的方法， 其中， 根据设定的 PDCCH块误码率 PDCCH BLER目标值确定所述 UE当前的 S INR的增大值和减小值。
11. 一种调整用户设备 UE的上行授权物理下行控制信道的基站， 包括： 接收模块， 接收 UE在当前的上行授权物理下行控制信道所指示的上行资 源上发送的物理上行共享信道；
判断模块， 根据所述接收模块接收到的物理上行共享信道， 判断所述 UE 是否成功接收了所述上行授权物理下行控制信道； 以及
调整模块， 根据所述判断模块的判断结果确定所述上行授权物理下行控 制信道占用的控制信道单元 CCE数量和 /或所述上行授权物理下行控制信道的 发射功率。
12. 如权利要求 11所述的基站， 其中， 所述判断模块对所述物理上行共 享信道上接收到的数据执行循环冗余码 CRC比特校验， 以确定所述 UE是否成 功接收了所述上行授权物理下行控制信道。
13. 如权利要求 12所述的基站，其中，如果所述判断模块执行的所述 CRC 比特校验的结果为匹配， 则判定所述 UE成功接收了所述上行授权物理下行控 制信道。
14. 如权利要求 12所述的基站， 其中， 所述判断模块包括判断单元、 测 量单元和比较单元， 所述判断单元执行所述 CRC比特校验， 在所述 CRC比特 匹配的结果为不匹配的情况下， 所述测量单元测量所述 UE在所述上行授权物 理下行控制信道上的接收信号强度， 所述比较单元将所述接收信号强度与预 定的门限值进行比较，
其中， 若所述接收信号强度高于预定的门限值， 则判定所述 UE成功接收 了所述上行授权物理下行控制信道； 以及若所述接收信号强度低于预定的门 限值， 则判定所述 UE没有成功接收所述上行授权物理下行控制信道。
15. 如权利要求 11所述的基站， 其中， 在所述判断模块判定所述 UE成 功接收了所述上行授权物理下行信道的情况下， 所述调整单元增大所述 UE当 前的信号与干扰加噪声比 SINR; 并根据增大的 SINR确定下一次发送给该 UE 的所述上行授权物理下行控制信道占用的 CCE数目和 /或下一次发送给该 UE 的所述上行授权物理下行控制信道的发射功率。
16. 如权利要求 11所述的基站， 其中， 在所述判断模块判定所述 UE没 有成功接收所述上行授权物理下行信道的情况下， 所述调整单元减小所述 UE 当前的 SINR; 并根据减小的 SINR确定下一次发送给该 UE的所述上行授权物 理下行控制信道占用的 CCE数目和 /或下一次发送给该 UE的所述上行授权物 理下行控制信道的发射功率。
17. 如权利要求 15或 16所述的基站， 其中， 所述当前的 SINR由所述 UE 上报的宽带信道质量指示 CQI指示。
18. 如权利要求 15或 16所述的基站， 其中， 所述当前的 SINR由所述 UE 的路径损耗值映射得到， 所述路径损耗值通过所述 UE上报的功率上升空间值 确定。
19. 如权利要求 15或 16所述的基站， 其中， 所述当前的 SINR是最近发 给所述 UE的上行授权物理下行控制信道的 SINR。
20. 如权利要求 15或 16所述的基站， 其中， 所述调整单元根据设定的 PDCCH块误码率 PDCCH BLER目标值确定所述 UE当前的 SINR的增大值和减 小值。
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