WO2016116019A1 - 增强载波聚合下共享的搜索空间方法以及基站和用户设备 - Google Patents

增强载波聚合下共享的搜索空间方法以及基站和用户设备 Download PDF

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WO2016116019A1
WO2016116019A1 PCT/CN2016/071172 CN2016071172W WO2016116019A1 WO 2016116019 A1 WO2016116019 A1 WO 2016116019A1 CN 2016071172 W CN2016071172 W CN 2016071172W WO 2016116019 A1 WO2016116019 A1 WO 2016116019A1
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search space
user equipment
base station
pdcch
epdcch
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PCT/CN2016/071172
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English (en)
French (fr)
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山田升平
蒋琦
骆喆
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夏普株式会社
上海交通大学
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Priority to US15/544,691 priority Critical patent/US20180013528A1/en
Publication of WO2016116019A1 publication Critical patent/WO2016116019A1/zh

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    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • 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
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the present invention relates to the field of wireless communication technologies. More specifically, the present invention relates to a resource configuration method for inter-device communication, and a base station and a user equipment.
  • Modern wireless mobile communication systems present two distinctive features.
  • One is broadband high speed.
  • the fourth generation wireless mobile communication system has a bandwidth of up to 100 MHz and a downlink rate of up to 1 Gbps.
  • the second is mobile internet, which promotes mobile Internet access and mobile video on demand. , emerging services such as online navigation.
  • These two characteristics put forward high requirements for wireless mobile communication technology, including: ultra-high-rate wireless transmission, inter-region interference suppression, reliable transmission of signals in mobile, distributed/centralized signal processing, and so on.
  • 4G fourth generation
  • 5G fifth generation
  • the uplink or downlink transmission can support the aggregation of up to five component carriers. If each component carrier is at most 20 MHz, the user equipment can support both uplink and downlink 100 MHz transmissions. In response to the increasing demand for data traffic, 100MHz transmission bandwidth has been difficult to meet future needs.
  • the 3GPP RAN#66 plenary session discussed a new research topic, LTE Carrier Aggregation Enhancement Beyond 5 Carriers (RP-142286), whose main purpose is to support up to 32 Component Carriers.
  • the search space and the number of blind detections of the PDCCH/EPDCCH of the user equipment are cell-specific design manners. That is, the search space corresponding to each serving cell is fixed, and the number of blind detections of each aggregation level of the PDCCH/EPDCCH is also fixed.
  • a UE can support monitoring of search space on 5 CCs at the same time, and perform blind detection of PDCCH/EPDCCH on these 5 CCs.
  • the search space required for monitoring by the UE needs to be expanded by more than 6 times (32/5), and the number of blind detections is also increased by a corresponding multiple. Obviously this brings about the complexity of the implementation of the UE. Bigger challenge.
  • This method is to solve the problem and give the corresponding solution.
  • each serving cell will have an independent search space. If you need to support up to 32 downlink serving cells to serve one user at the same time, the space required for monitoring will be very large, and the time-frequency resources will be occupied a lot.
  • a communication method in a base station includes: a base station communicating with a user equipment on a plurality of serving cells, and configuring a search space sharing indication for the plurality of cells.
  • the method further includes: the base station transmitting, to the user equipment, a physical downlink control channel PDCCH/enhanced physical downlink control channel EPDCCH based on the user equipment specific search space, where the user equipment is configured with a carrier indication domain CIF or an enhanced carrier indication
  • the candidate bits of the enhanced control channel element ECCE of the control channel unit CCE/EPDCCH of the PDCCH that is configured to be detected by each serving cell sharing the search space are in the entire search space The location is determined by the cell identity of another serving cell with which the search space is shared.
  • a communication method in a user equipment includes: the user equipment communicates with the base station on multiple serving cells, and receives a search space sharing indication configured by the base station for multiple cells.
  • the method further includes the user equipment receiving a PDCCH/EPDCCH based on a user equipment specific search space, wherein, in a case where the user equipment is configured with a carrier indication domain CIF or an enhanced carrier indication domain ECIF and configured with a shared search space
  • the candidate bit of the enhanced control channel element ECCE of the control channel element CCE/EPDCCH of the PDCCH that is configured to be detected by each serving cell sharing the search space is shared by the configured search space in the entire search space
  • the cell identity of a serving cell is determined.
  • a base station comprising a multi-cell communication unit and a PDCCH/EPDCCH transmitting unit.
  • the multi-serving cell communication unit is configured to communicate with a user equipment on multiple serving cells, and configure a search space sharing indication for multiple cells.
  • the PDCCH/EPDCCH transmitting unit is configured to send a PDCCH/EPDCCH based on a user equipment specific search space to a user equipment, where the user equipment is configured with a carrier indication domain CIF or an enhanced carrier indication domain ECIF and configured to be shared.
  • the candidate bit of the enhanced control channel element ECCE of the control channel element CCE/EPDCCH of the PDCCH that is configured to be detected by each serving cell of the shared search space is configured by the location of the entire search space The cell identity of another serving cell sharing the search space is determined.
  • a user equipment comprising a multi-cell communication unit and a PDCCH/EPDCCH receiving unit.
  • the multi-serving cell communication unit is configured to communicate with a base station on multiple serving cells, and receive a search space sharing indication configured by the base station for multiple cells.
  • the PDCCH/EPDCCH receiving unit is configured to receive a PDCCH/EPDCCH based on a user equipment specific search space, where a user equipment is configured with a carrier indication domain CIF or an enhanced carrier indication domain ECIF and a shared search space is configured.
  • the candidate bit of the enhanced control channel element ECCE of the control channel unit CCE/EPDCCH of the PDCCH that is configured to be detected by each serving cell sharing the search space is shared by the configured search space in the entire search space.
  • the cell identity of another serving cell is determined.
  • the number of candidate locations corresponding to each aggregation level of the PDCCH/EPDCCH in the search space corresponding to the serving cell configured to share the search space is configured by the base station.
  • some or all of the 32 downlink serving cells can be configured in the same search space, so as to reduce the size of the search space that needs to be detected, and reduce the time-frequency resources that need to be occupied. quantity.
  • the number of candidate locations on each aggregation level of each service is further reduced.
  • FIG. 1 shows a flow chart of a method of a base station and a user equipment side according to an embodiment of the present invention
  • FIG. 2 is a block diagram showing the structure of a base station according to an embodiment of the present invention.
  • FIG. 3 shows a structural block diagram of a user equipment according to an embodiment of the present invention.
  • the present invention provides a method for transmitting a physical control channel (PDCCH)/enhanced physical control channel (EPDCCH) based on a user-specific search space when a user equipment communicates on multiple serving cells.
  • the present invention also provides a PDCCH/EPDCCH reception and decoding method of a user equipment corresponding to the transmission method.
  • FIG. 1 is a flowchart of a communication method between a base station and a user equipment side according to an embodiment of the present invention. As shown, the method on the base station side includes steps S101 and S102. The method of user equipment measurement includes steps S201 and S202.
  • step S101 the base station communicates with the user equipment on a plurality of serving cells, and configures a search space sharing indication for the plurality of cells.
  • the search space sharing indication is an SCellIndex information element (IE) in TS 36.331, that is, a serving cell that indicates that the serving cell sharing the search space with the serving cell is the indicated SCellIndex.
  • IE SCellIndex information element
  • the search space sharing indication is physCellId in TS 36.331, that is, the physical cell identifier of the serving cell indicating that the search space is shared with the serving cell is the indicated physCellId.
  • the search space sharing indication is a set of SCellIndex information elements (IEs) in TS 36.331, that is, a group of serving cells corresponding to the indicated SCellIndex, indicating that the serving cell sharing the search space with the serving cell .
  • IEs SCellIndex information elements
  • the search space sharing indication is a set of physCellIds in TS 36.331, that is, a physical small group representing a group of serving cells sharing a search space with the serving cell.
  • the zone ID is the indicated physCellId.
  • step S201 the user equipment communicates with the base station on multiple serving cells, and receives a search space sharing indication of multiple cells configured by the base station.
  • the base station transmits a PDCCH/EPDCCH based on the user-specific search space to the user, where the user equipment is configured with the carrier indication domain CIF or the enhanced carrier indication domain ECIF and is configured with the shared search space.
  • Candidates of enhanced control channel elements (ECCEs) of the PDCCH control channel elements (CCEs)/EPDCCHs that are required to be detected by each serving cell sharing the search space. The location of the entire search space is determined by the cell identity of another serving cell with which the user equipment is configured to share the search space.
  • a carrier indicator fielded CIF
  • ECIF Extended carrier indicator field
  • k is the subframe number
  • Y k is a fixed difference associated with k and the RNTI allocated by the UE
  • N CCE,k is the number of all CCEs in the kth subframe
  • i is 0 to L-1.
  • the serving cell is configured with a shared search space indication c, which is used for calculation below.
  • c is the SCellIndex of the serving cell sharing the search space with the serving cell.
  • k is the subframe number
  • Y p,k is the value of Y on the kth subframe on the pth EPDCCH-PRB-set
  • N ECCE,k is the kth on the pth EPDCCH-PRB-set
  • the candidate number (candidate number) corresponding to each aggregation level of the PDCCH/EPDCCH in the search space corresponding to the serving cell configured to share the search space is configured by the base station.
  • the search position indicating the PDCCH candidate corresponding to the aggregation level L is used for calculation
  • M (L) is configured by the base station.
  • M (L) is configured by the base station to be less than or equal to the number of candidate positions on each existing aggregation level.
  • the aggregation level is 1/2/4/8, and its M (L) is 2/2. /1/1 (existing is 6/6/2/2).
  • the user equipment receives the PDCCH/EPDCCH based on the user equipment specific search space and performs demodulation, wherein the user equipment is configured with the carrier indication domain CIF or the enhanced carrier indication domain ECIF and is configured to share
  • the control channel elements (CCEs) of the PDCCH that are required to be detected by each serving cell sharing the search space/enhanced control channel elements (ECCEs) of the EPDCCH
  • the location of the candidate bits m throughout the search space is determined by the cell identity of the other serving cell with which the search space is configured.
  • k is the subframe number
  • Y k is a fixed difference associated with k and the RNTI allocated by the UE
  • N CCE,k is the number of all CCEs in the kth subframe
  • i is 0 to L-1.
  • n CI is configured with a shared search space indication c, which is used for calculation below.
  • c is the SCellIndex of the serving cell sharing the search space with the serving cell.
  • k is the subframe number
  • Y p,k is the value of Y on the kth subframe on the pth EPDCCH-PRB-set
  • N ECCE,k is the kth on the pth EPDCCH-PRB-set
  • the candidate number (candidate number) corresponding to each aggregation level of the PDCCH/EPDCCH in the search space corresponding to the serving cell configured to share the search space is configured by the base station.
  • the search position indicating the PDCCH candidate corresponding to the aggregation level L is used for calculation
  • M (L) is configured by the base station.
  • M (L) is configured by the base station to be less than or equal to the number of candidate positions on each existing aggregation level.
  • the aggregation level is 1/2/4/8, and its M (L) is 2/2. /1/1 (existing is 6/6/2/2).
  • the base station 300 includes a multi-cell communication unit 301 and a PDCCH/EPDCCH transmitting unit 302.
  • the multi-serving cell communication unit 301 is configured to communicate with the user equipment on a plurality of serving cells, and configure a search space sharing indication for the plurality of cells.
  • the PDCCH/EPDCCH transmitting unit 302 is configured to send the PDCCH/EPDCCH based on the user equipment specific search space to the user equipment, where the user equipment is configured with the carrier indication domain CIF or the enhanced carrier indication domain ECIF and configured to share the search.
  • candidate bits of control channel elements (CCEs)/enhanced enhanced control channel elements (ECCEs) of the PDCCH that are configured to be detected by each serving cell sharing the search space (candidates)m The location of the entire search space is small by another configured serving cell with which the search space is shared.
  • CCEs control channel elements
  • ECCEs enhanced enhanced control channel elements
  • the user equipment 400 includes a multi-cell communication unit 401 and a PDCCH/EPDCCH receiving unit 402.
  • the multi-serving cell communication unit 401 is configured to communicate with the base station on multiple serving cells, and receive a search space sharing indication configured by the base station for multiple cells.
  • the PDCCH/EPDCCH receiving unit 402 is configured to receive a PDCCH/EPDCCH based on the user equipment-specific search space sent by the base station, and perform demodulation according to the shared search space, where the user equipment is configured with a carrier indication field CIF or an enhanced carrier indication.
  • control channel elements (CCEs) of the PDCCH that are required to be detected by each serving cell sharing the search space/enhanced control channel unit of the EPDCCH (enhanced)
  • the candidate bits of control channel elements (ECCEs) are determined in the location of the entire search space by the cell identity of the other serving cell with which the search space is shared.
  • the above-described embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware.
  • the base station and various components within the user equipment in the above embodiments may be implemented by various devices including, but not limited to, analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, and programmable processing. , Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (CPLDs), and more.
  • ASICs Application Specific Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • CPLDs Programmable Logic Devices
  • base station refers to a mobile communication data and control switching center having a large transmission power and a relatively large coverage area, including resource allocation scheduling, data reception and transmission, and the like.
  • User equipment refers to a user mobile terminal, for example, a terminal device including a mobile phone, a notebook, etc., which can perform wireless communication with a base station or a micro base station.
  • embodiments of the invention disclosed herein may be implemented on a computer program product.
  • the computer program product is a product having a computer readable medium encoded with computer program logic that, when executed on a computing device, provides related operations to implement The above technical solution of the present invention.
  • the computer program logic When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention.
  • Such an arrangement of the present invention is typically provided as software, code and/or other data structures, or such as one or more, that are arranged or encoded on a computer readable medium such as an optical medium (e.g., CD-ROM), floppy disk, or hard disk.
  • Software or firmware or such a configuration may be installed on the computing device such that one or more processors in the computing device perform the technical solutions described in the embodiments of the present invention.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明提供了一种基站中的通信方法和相应的基站。所述方法包括：基站与用户设备在多个服务小区上进行通信，并为多个小区配置搜索空间共享指示。所述方法还包括：基站将基于用户设备特定搜索空间的物理下行控制信道PDCCH/增强的物理下行控制信道EPDCCH发送给用户设备，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。相应地，本发明还提供了一种用户设备中的通信方法和相应的用户设备。

Description

增强载波聚合下共享的搜索空间方法以及基站和用户设备 技术领域
本发明涉及无线通信技术领域。更具体地，本发明涉及设备间通信的资源配置方法以及基站和用户设备。
背景技术
现代无线移动通信系统呈现出两个显著特点，一是宽带高速率，比如第四代无线移动通信系统的带宽可达100MHz，下行速率高达1Gbps；二是移动互联，推动了移动上网、手机视频点播、在线导航等新兴业务。这两个特点对无线移动通信技术提出了较高要求，主要有：超高速率无线传输、区域间干扰抑制、移动中可靠传输信号、分布式/集中式信号处理等等。在未来的增强第四代(4G)及第五代(5G)无线移动通信系统中，为了满足上述发展需求，各种相应的关键技术开始被提出和论证，值得本领域的研究人员广泛关注。
在2007年10月，国际电信联盟(ITU)批准全球微波互联接入系统(WiMax，Worldwide Interoperability for Microwave Access)成为第四个3G系统标准。这一发生在3G时代末期的事件，实际上是4G标准争夺战的预演。事实上，为了应对以无线局域网和WiMax为代表的无线IP技术流的挑战，从2005年开始，第三代3GPP组织就着手进行全新的系统升级，即长期演进系统(LTE，Long Term Evolution)的标准化工作。这是一个基于正交频分复用技术(OFDM，Orthogonal Frequency Division Multiplexing)的准四代系统，已于2009年初推出第一版，并在2010年陆续在全球开始商用。与此同时，3GPP组织关于第四代无线移动通信系统(4G，the Fourth Generation)的标准化制定工作也已经于2008年上半年启动，该系统称为先进的长期演进系统(LTE-A，Long Term Evolution Advanced)。该系统的物理层过程的关键标准化文书已于2011年初完成。在2011年11月ITU组织在中国重庆正式宣布，LTE-A系统和WiMax系统是4G系统的两个官方标准。目前，LTE-A系统的商用过程正在全球范围逐步展开。
根据未来十年的挑战，对于增强的第四代无线移动通信系统，大致 有以下几点发展需求：
-更高的无线宽带速率，且重点优化局部的小区热点区域；
-进一步提高用户体验，特别需要优化小区边界区域的通信服务；
-考虑到可用频谱不可能有1000倍的扩展，故需要继续研究能够提高频谱利用效率的新技术；
-高频段的频谱(5GHz，甚至更高)必将投入使用，以获得较大的通信带宽；
-现有网络(2G/3G/4G，WLAN，WiMax等)的协同工作，以分担数据流量；
-针对不同业务、应用和服务特定优化；
-加强系统支持大规模机器通信的能力；
-灵活、智能且廉价的网络规划与布网；
-设计方案以节省网络的用电量和用户设备的电池消耗。
-增强的载波聚合技术，以支持最高达到32个分量载波(Component Carrier)的聚合
传统的3GPP LTE系统中，无论上行还是下行传输，目前最多可以支持5个分量载波的聚合，若每个分量载波最大为20MHz，则用户设备最大可以同时支持上行和下行100MHz的传输。针对日益增涨的数据流量的需求，100MHz的传输带宽已很难满足未来的需求。3GPP RAN#66次全会讨论了一个新的研究课题，即增强的载波聚合(LTE Carrier Aggregation Enhancement Beyond 5Carriers)的研究(RP-142286)，主要目的是研究支持多达32个量载波(Component Carrier)的在上行和下行的聚合技术，以提高传输速率。
基于此目的，系统设计将会存在一个关键的问题，即用户设备的复杂度问题。目前用户设备PDCCH/EPDCCH的搜索空间及盲检测次数是小区特定的设计方式。即每个服务小区对应的搜索空间是固定的，而PDCCH/EPDCCH每个聚合等级的盲检测次数也是固定。一个UE最多可以支持同时监测5个CC上的搜索空间，并在这5个CC进行PDCCH/EPDCCH的盲检测。若要支持多达32个CC在下行同时传输，按照现有协议，则需要将UE所需监测的搜索空间扩大6倍多(32/5)，且盲检次数也会增加相应的倍数。显然这对于UE的实现复杂度，带来的 较大的挑战。
本方法即针对此问题，给出了相应的解决方法。
发明内容
本发明所要克服的技术问题在于，若沿用原有的搜索空间的设计方式，则每个服务小区将会有独立的搜索空间。若需要支持多达32个下行服务小区对一个用户同时进行服务，则所需要的监测的空间将会非常巨大，占用的时频资源将会很多。
为解决上述问题，根据本发明的第一方面，提供了一种基站中的通信方法。所述方法包括：基站与用户设备在多个服务小区上进行通信，并为多个小区配置搜索空间共享指示。所述方法还包括：基站将基于用户设备特定搜索空间的物理下行控制信道PDCCH/增强的物理下行控制信道EPDCCH发送给用户设备，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
根据本发明的第二方面，提供了一种用户设备中的通信方法。所述方法包括：用户设备与基站在多个服务小区上进行通信，并接收基站为多个小区配置的搜索空间共享指示。所述方法还包括：用户设备接收基于用户设备特定搜索空间的PDCCH/EPDCCH，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
根据本发明的第三方面，提供了一种基站，包括多服务小区通信单元和PDCCH/EPDCCH发送单元。所述多服务小区通信单元用于与用户设备在多个服务小区上进行通信，并为多个小区配置搜索空间共享指示。 所述PDCCH/EPDCCH发送单元用于将基于用户设备特定搜索空间的PDCCH/EPDCCH发送给用户设备，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
根据本发明的第四方面，提供了一种用户设备，包括多服务小区通信单元和PDCCH/EPDCCH接收单元。所述多服务小区通信单元用于与基站在多个服务小区上进行通信，并接收基站为多个小区配置的搜索空间共享指示。所述PDCCH/EPDCCH接收单元用于接收基于用户设备特定搜索空间的PDCCH/EPDCCH，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
可选地，被配置为共享搜索空间的服务小区对应的搜索空间中PDCCH/EPDCCH每个聚合等级下对应的候选位置数由基站配置。通过本发明的共享搜索空间的方式，可以将32个下行服务小区中的部分或全部小区配置在同一个搜索空间上，以降低需要检测的搜索空间的大小，并降低实际需要占用的时频资源的数量。进一步的，通过配置每个服务每个聚合等级上的候选位置数，进一步降低UE的对PDCCH/EPDCCH的盲检测次数。
附图说明
通过下文结合附图的详细描述，本发明的上述和其它特征将会变得更加明显，其中：
图1示出了根据本发明的一个实施例的基站和用户设备侧的方法的流程图；
图2示出了根据本发明的一个实施例的基站的结构框图；以及
图3示出了根据本发明的一个实施例的用户设备的结构框图。
具体实施方式
本发明提供了一种基站对于用户设备在多个服务小区上进行通信时，基于用户特定搜索空间的物理控制信道(PDCCH)/增强的物理控制信道(EPDCCH)的发送方法。相应地，本发明还提供了与该发送方法相对应的用户设备的PDCCH/EPDCCH接收及解码方法。
应当注意，本发明不应局限于下文所述的具体实施例。另外，为了简便起见，省略了对与本发明没有直接关联的公知技术的详细描述，以防止对本发明的理解造成混淆。
下文以LTE移动通信系统及其后续的演进版本作为示例应用环境，具体描述了根据本发明的多个实施例。然而，需要指出的是，本发明不限于以下实施例，而是可适用于更多其它的无线通信系统，例如今后的5G蜂窝通信系统。
图1为根据本发明实施例的基站和用户设备侧的通信方法的流程图。如图所示，基站侧的方法包括步骤S101和S102。用户设备测的方法包括步骤S201和S202。
在步骤S101中，基站与用户设备在多个服务小区上进行通信，并为多个小区配置搜索空间共享指示。
作为一个实施例，该搜索空间共享指示为TS 36.331中SCellIndex信息单元(information element，IE)，即表示与该服务小区共享搜索空间的服务小区为所指示的SCellIndex对应的服务小区。
作为一个实施例，该搜索空间共享指示为TS 36.331中physCellId，即表示与该服务小区共享搜索空间的服务小区的物理小区标识为所指示的physCellId。
作为另一个实施例，该搜索空间共享指示为TS 36.331中一组SCellIndex信息单元(information element，IE)，即表示与该服务小区共享搜索空间的服务小区为所指示的SCellIndex对应的一组服务小区。
作为另一个实施例，该搜索空间共享指示为TS 36.331中一组physCellId，即表示与该服务小区共享搜索空间的一组服务小区的物理小 区标识为所指示的physCellId。
相应地，在步骤S201中，用户设备与基站在多个服务小区上进行通信，并接收基站配置的多个小区的搜索空间共享指示。
在步骤S102中，基站将基于用户特定搜索空间的PDCCH/EPDCCH发送给用户，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元(control channel elements，CCEs)/EPDCCH的增强控制信道单元(enhanced control channel elements，ECCEs)的候选位(candidates)m在整个搜索空间的位置由用户设备所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
作为一个实施例，若用
Figure PCTCN2016071172-appb-000001
表示在聚合等级L∈{1，2，4，8}上对应的PDCCH候选的搜索位置，则若检测PDCCH的UE被配置了载波指示域(carrier indicator fielded，CIF)或增强的载波指示域(extended carrier indicator field，ECIF)，且服务小区被配置了共享搜索空间指示c，则下面用于计算
Figure PCTCN2016071172-appb-000002
的公式中m′＝m+M(L)·c，其中c为与该服务小区共享搜索空间的服务小区的SCellIndex。
Figure PCTCN2016071172-appb-000003
其中，k为子帧号，Yk为与k和UE分配的RNTI相关的一个固定差数，NCCE，k为在第k个子帧上所有CCE的数目，i为0至L-1。
作为另一个实施例，若用
Figure PCTCN2016071172-appb-000004
表示在聚合等级L∈{l，2，4，8，16，32}上对应的EPDCCH候选的搜索位置，则若检测PDCCH的UE被配置了载波指示域(carrier indicator fielded，CIF)或增强的载波指示域(extended carrier indicator field，ECIF)，且服务小区被配置了共享搜索空间指示c，则下面用于计算
Figure PCTCN2016071172-appb-000005
的公式中b＝c，其中c为与该服务小区共享搜索空间的服务小区的SCellIndex。
Figure PCTCN2016071172-appb-000006
其中，k为子帧号，Yp，k为在第p个EPDCCH-PRB-set上第k个子帧上Y的值，NECCE，k为在第p个EPDCCH-PRB-set上在第k个子帧上所有CCE的数目，i为0至L-1。
以上给出的基于共享搜索空间指示c确定
Figure PCTCN2016071172-appb-000007
或
Figure PCTCN2016071172-appb-000008
的方式是说明性而非限制性的，本领域技术人员可以想到基于共享搜索空间指示c来 确定
Figure PCTCN2016071172-appb-000009
或
Figure PCTCN2016071172-appb-000010
的其他方式。
此外，被配置为共享搜索空间的服务小区对应的搜索空间中PDCCH/EPDCCH每个聚合等级(aggregation level)下对应的候选数(candidate number)由基站配置。
作为一个实施例，若用
Figure PCTCN2016071172-appb-000011
表示在聚合等级L上对应的PDCCH候选的搜索位置，则用于计算
Figure PCTCN2016071172-appb-000012
的公式中m′＝m+M(L)·c，其中M(L)由基站配置。举例来说，M(L)为基站配置的小于或等于现有的每个聚合等级上的候选位置数，如对于聚合等级为1/2/4/8，其M(L)为2/2/1/1(现有的为6/6/2/2)。
作为另一个实施例，若用
Figure PCTCN2016071172-appb-000013
表示在聚合等级L上对应的EPDCCH候选的搜索位置，则下面用于计算
Figure PCTCN2016071172-appb-000014
的公式中，其中
Figure PCTCN2016071172-appb-000015
由基站配置。举例来说，
Figure PCTCN2016071172-appb-000016
为基站配置的小于或等于现有的每个聚合等级上的候选位置数，如对于聚合等级为2/4/8/16/32，其
Figure PCTCN2016071172-appb-000017
为2/2/1/I/0。
相应地，在步骤S202中，用户设备接收基于用户设备特定搜索空间的PDCCH/EPDCCH并进行解调，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元(control channel elements，CCEs)/EPDCCH的增强控制信道单元(enhanced control channel elements，ECCEs)的候选位(candidates)m在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
作为一个实施例，若用
Figure PCTCN2016071172-appb-000018
表示在聚合等级L∈{1，2，4，8}上对应的PDCCH候选的搜索位置，则若检测PDCCH的UE被配置了载波指示域(carrier indicator field，CIF)或增强的载波指示域(extended carrier indicator field，ECIF)，且服务小区nCI被配置了共享搜索空间指示c，则下面用于计算
Figure PCTCN2016071172-appb-000019
的公式中m′＝m+M(L)·c，其中c为与该服务小区共享搜索空间的服务小区的SCellIndex。
Figure PCTCN2016071172-appb-000020
其中，k为子帧号，Yk为与k和UE分配的RNTI相关的一个固定差数，NCCE，k为在第k个子帧上所有CCE的数目，i为0至L-1。
作为另一个实施例，若用
Figure PCTCN2016071172-appb-000021
表示在聚合等级L∈{1，2，4，8，16，32}上对应的EPDCCH候选的搜索位置，则若检测PDCCH的UE被配置了载波 指示域(carrier indicator field，CIF)或增强的载波指示域(extended carrier indicator field，ECIF)，且服务小区nCI被配置了共享搜索空间指示c，则下面用于计算
Figure PCTCN2016071172-appb-000022
的公式中b＝c，其中c为与该服务小区共享搜索空间的服务小区的SCellIndex。
Figure PCTCN2016071172-appb-000023
其中，k为子帧号，Yp，k为在第p个EPDCCH-PRB-set上第k个子帧上Y的值，NECCE，k为在第p个EPDCCH-PRB-set上在第k个子帧上所有CCE的数目，i为0至L-1。
此外，被配置为共享搜索空间的服务小区对应的搜索空间中PDCCH/EPDCCH每个聚合等级(aggregation level)下对应的候选数(candidate number)由基站配置。
作为一个实施例，若用
Figure PCTCN2016071172-appb-000024
表示在聚合等级L上对应的PDCCH候选的搜索位置，则用于计算
Figure PCTCN2016071172-appb-000025
的公式中m′＝m+M(L)·c，其中M(L)由基站配置。举例来说，M(L)为基站配置的小于或等于现有的每个聚合等级上的候选位置数，如对于聚合等级为1/2/4/8，其M(L)为2/2/1/1(现有的为6/6/2/2)。
作为另一个实施例，若用
Figure PCTCN2016071172-appb-000026
表示在聚合等级L上对应的EPDCCH候选的搜索位置，则下面用于计算
Figure PCTCN2016071172-appb-000027
的公式中，其中
Figure PCTCN2016071172-appb-000028
由基站配置。举例来说，
Figure PCTCN2016071172-appb-000029
为基站配置的小于或等于现有的每个聚合等级上的候选位置数，如对于聚合等级为2/4/8/16/32，其
Figure PCTCN2016071172-appb-000030
为2/2/1/I/0。
下面，参照图2和图3，描述根据本发明实施例的基站300和用户设备400的结构框图。
如图2所示，基站300包括多服务小区通信单元301和PDCCH/EPDCCH发送单元302。多服务小区通信单元301用于与用户设备在多个服务小区上进行通信，并为多个小区配置搜索空间共享指示。PDCCH/EPDCCH发送单元302用于将基于用户设备特定搜索空间的PDCCH/EPDCCH发送给用户设备，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元(control channel elements，CCEs)/EPDCCH的增强控制信道单元(enhanced control channel elements，ECCEs)的候选位(candidates)m在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小 区标识来决定。
如图3所示，用户设备400包括多服务小区通信单元401和PDCCH/EPDCCH接收单元402组成。多服务小区通信单元401用于与基站在多个服务小区上进行通信，并接收基站为多个小区配置的搜索空间共享指示。PDCCH/EPDCCH接收单元402用于接收基站发送的基于用户设备特定搜索空间的PDCCH/EPDCCH，并按照共享的搜索空间进行解调，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元(control channel elements，CCEs)/EPDCCH的增强控制信道单元(enhanced control channel elements，ECCEs)的候选位(candidates)m在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
应该理解，本发明的上述实施例可以通过软件、硬件或者软件和硬件两者的结合来实现。例如，上述实施例中的基站和用户设备内部的各种组件可以通过多种器件来实现，这些器件包括但不限于：模拟电路器件、数字电路器件、数字信号处理(DSP)电路、可编程处理器、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、可编程逻辑器件(CPLD)，等等。
在本申请中，“基站”是指具有较大发射功率和较广覆盖面积的移动通信数据和控制交换中心，包括资源分配调度、数据接收发送等功能。“用户设备”是指用户移动终端，例如包括移动电话、笔记本等可以与基站或者微基站进行无线通信的终端设备。
此外，这里所公开的本发明的实施例可以在计算机程序产品上实现。更具体地，该计算机程序产品是如下的一种产品：具有计算机可读介质，计算机可读介质上编码有计算机程序逻辑，当在计算设备上执行时，该计算机程序逻辑提供相关的操作以实现本发明的上述技术方案。当在计算系统的至少一个处理器上执行时，计算机程序逻辑使得处理器执行本发明实施例所述的操作(方法)。本发明的这种设置典型地提供为设置或编码在例如光介质(例如CD-ROM)、软盘或硬盘等的计算机可读介质上的软件、代码和/或其他数据结构、或者诸如一个或多个ROM或RAM或PROM芯片上的固件或微代码的其他介质、或一个或多个模块中的可 下载的软件图像、共享数据库等。软件或固件或这种配置可安装在计算设备上，以使得计算设备中的一个或多个处理器执行本发明实施例所描述的技术方案。
尽管以上已经结合本发明的优选实施例示出了本发明，但是本领域的技术人员将会理解，在不脱离本发明的精神和范围的情况下，可以对本发明进行各种修改、替换和改变。因此，本发明不应由上述实施例来限定，而应由所附权利要求及其等价物来限定。

Claims (8)

  1. 一种基站中的通信方法，包括：
    基站与用户设备在多个服务小区上进行通信，并为多个小区配置搜索空间共享指示；以及
    基站将基于用户设备特定搜索空间的物理下行控制信道PDCCH/增强的物理下行控制信道EPDCCH发送给用户设备，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
  2. 根据权利要求1所述的方法，其中，被配置为共享搜索空间的服务小区对应的搜索空间中PDCCH/EPDCCH每个聚合等级下对应的候选位置数由基站配置。
  3. 一种用户设备中的通信方法，包括：
    用户设备与基站在多个服务小区上进行通信，并接收基站为多个小区配置的搜索空间共享指示；
    用户设备接收基于用户设备特定搜索空间的PDCCH/EPDCCH，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
  4. 根据权利要求3所述的方法，其中，被配置为共享搜索空间的服务小区对应的搜索空间中PDCCH/EPDCCH每个聚合等级下对应的候选位置数由基站配置。
  5. 一种基站，包括：
    多服务小区通信单元，用于与用户设备在多个服务小区上进行通信，并为多个小区配置搜索空间共享指示；以及
    PDCCH/EPDCCH发送单元，用于将基于用户设备特定搜索空间的 PDCCH/EPDCCH发送给用户设备，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
  6. 根据权利要求5所述的基站，其中，被配置为共享搜索空间的服务小区对应的搜索空间中PDCCH/EPDCCH每个聚合等级下对应的候选位置数由基站配置。
  7. 一种用户设备，包括：
    多服务小区通信单元，用于与基站在多个服务小区上进行通信，并接收基站为多个小区配置的搜索空间共享指示；
    PDCCH/EPDCCH接收单元，用于接收基于用户设备特定搜索空间的PDCCH/EPDCCH，其中，在用户设备被配置了载波指示域CIF或增强的载波指示域ECIF且被配置了共享的搜索空间的情况下，被配置为共享搜索空间的每个服务小区所需要检测的PDCCH的控制信道单元CCE/EPDCCH的增强控制信道单元ECCE的候选位在整个搜索空间的位置由所配置的与之共享搜索空间的另一服务小区的小区标识来决定。
  8. 根据权利要求7所述的用户设备，其中，被配置为共享搜索空间的服务小区对应的搜索空间中PDCCH/EPDCCH每个聚合等级下对应的候选位置数由基站配置。
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