US9271266B2 - Searching for control channels in a wireless network - Google Patents

Searching for control channels in a wireless network Download PDF

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US9271266B2
US9271266B2 US12/451,350 US45135008A US9271266B2 US 9271266 B2 US9271266 B2 US 9271266B2 US 45135008 A US45135008 A US 45135008A US 9271266 B2 US9271266 B2 US 9271266B2
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control channel
user equipment
cces
candidate
uplink communication
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US20100208666A1 (en
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Frank Frederiksen
Troels Emil Kolding
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Wireless Future Technologies Inc
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    • H04W72/0406—
    • 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
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H04B7/2637—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for logical channel control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • 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
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/001—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to control information
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the method described below relates to control channels in communication network systems, and in particular to control channel allocation and decoding e.g. in 3GPP (3 rd Generation Partnership Project) LTE (Long Term Evolution) network systems.
  • 3GPP 3 rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE technology defines a packet radio system, where all channel allocations are expected to happen in short periods of sub-frames. This is contrary to the older 3G systems, where dedicated signalling channels are necessary to be set up even for packet traffic. It is also different from WLAN (Wireless Local Area Network) type of allocations, where each IP (Internet Protocol) packet transmission contains a transport header.
  • WLAN Wireless Local Area Network
  • All allocations are signalled in Shared Control Channels, which are present in first multi-carrier symbols of a sub-frame preceding multi-carrier symbols of data channels.
  • the control channels are separately coded. That is, a downlink (or uplink) channel is divided into two separate parts, one for control and one for data.
  • the data part (PDSCH) carries downlink (or uplink) data for simultaneously scheduled users, while the control part (PDCCH) carries (among others) allocation information for the scheduled users.
  • the methods and devices described below are for reducing control channel decoding complexity.
  • the method may be implemented as a computer program product.
  • a tree search for aggregated control channels is reduced in a systematic way, which will obtain a significant reduction of the number of decoding attempts at a UE (User Equipment) side, while still maintaining most of the scheduling flexibility in an eNB (evolved Node B), i.e. system spectral efficiency versus UE complexity trade-off is obtained.
  • UE User Equipment
  • eNB evolved Node B
  • the UE utilizes the tree structure to reduce the decoding complexity in order to save power. According to an embodiment, power consumption in the decoding/detection of an L1/L2 control channel can be reduced.
  • the method is not limited to LTE network systems, but can be applied to any other communication systems requiring dynamic and fast channel allocation, including systems where there will be multiple code rates for the control channel.
  • FIG. 1 is an example of a tree structure with three allocated nodes in different levels of the tree.
  • FIG. 2 is a data structure diagram of the three allocated nodes of FIG. 1 mapped to sub-carrier resources in a distributed manner.
  • FIG. 3 is a matrix diagram illustrating a combination of control channel elements to create aggregated control channel candidates.
  • FIG. 4 is a data structure diagram of an example illustrating reduction of possible aggregation options for control channel candidates according to an embodiment.
  • FIG. 5 is a schematic block diagram illustrating functions of a user equipment and a network device according to an embodiment.
  • a Physical Downlink Shared Control Channel which carries (among others) allocation information for simultaneously scheduled users of a communication network system is arranged to a tree structure having of multiple control channel elements as shown in FIG. 1 .
  • a UE User Equipment
  • a UE User Equipment
  • Each code block is called a control channel candidate as it potentially carries information for one MAC (Medium Access Control) ID.
  • the MAC ID is used by the UE or by a group of UEs to detect the channel.
  • each node represents a single control channel of a code block.
  • the system bandwidth of a given number of sub-carrier resources may be divided to an integer multiple of the largest control channels.
  • a given node of the tree i.e., a set of sub-carriers, can be one control channel of the largest code block, of up to two control channels of the second largest code blocks or up to four control channels of the smallest code blocks.
  • Each control channel extends entirely over the first n OFDM symbols, which are available for the control channels.
  • the control channels may be distributed to the sub-carriers over the system bandwidth to maximize the frequency diversity. For example, there are 4 distributed sets of sub-carrier resources allocated per each code-block. This is illustrated in FIG. 2 .
  • FIG. 1 three allocated nodes CB 1 , CB 2 , CB 3 in different levels of the tree structure are shown.
  • FIG. 2 shows the three allocated nodes CB 1 , CB 2 , CB 3 mapped to the sub-carrier resources in a distributed manner. It should be noted that these mappings are only examples, and that the mapping in general should provide frequency diversity by scattering over the system bandwidth.
  • each control channel has to be uniquely identified by a MAC ID, it can be combined to CRC (Cyclic Redundancy Code) by partly masking CRC bits with the MAC-ID.
  • CRC Cyclic Redundancy Code
  • the MAC ID is used for addressing both UE specific control channels and common control channels, it is reasonable to define the MAC ID in a compatible way. Thus, reception of any control channel is possible by filtering control channels with the respective MAC ID. Error detection is available from the MAC ID masked CRC.
  • the length of the MAC ID is matched to the C-RNTI (Cell Radio Network Temporary Identifier) length.
  • a receiver receives symbols of the Downlink Shared Control Channel part of the sub-frame prior to reception and processing of the symbols in the downlink and uplink Shared Data Channels.
  • the receiver demodulates and decodes the sub-carriers of the OFDM symbols in which the receiver may search for a set of largest code blocks, e.g. CB 1 of FIG. 1 .
  • the Code Block is of known size and the system bandwidth is known, the receiver knows an integer multiple of sub-carrier positions to search for a CB 1 .
  • the reception, whether correctly detected or not, may be recognized by Cyclic Redundancy Check detector filtered by a receiver specific c-RNTI identity.
  • the receiver knows that the next higher level of tree is masked and not available. For every non-matched CRC check, the UE will continue decoding code blocks (CB 2 ) in the next higher level of the tree searching for a match in two child nodes of the parent node. Further on, for every non-matched CRC check, the UE will continue decoding code blocks (CB 3 ) in the next higher level of the tree searching for a match in two child nodes of the parent node. The search continues until the UE has detected and correctly decoded all control channels, intended for its reception.
  • the UE may have to search for common signalling entries by common identifiers.
  • the search in the tree may happen in any other order than from the lowest level node towards the higher level nodes.
  • the receiver may process the nodes from the highest level of nodes to the lower level of nodes. Further on, the receiver may process the nodes in other arbitrary (or systematic) order based on some measures e.g. SINR (Signal Interference and Noise Ratio) quality of the candidate code block(s).
  • SINR Signal Interference and Noise Ratio
  • control channel element Aggregation of multiple control channel elements can be used to get larger payloads and/or lower coding rate.
  • control channel elements may require a large number of decoding attempts from all the UEs that are listening for a possible allocation.
  • An example of a control channel aggregation is shown in FIG. 3 .
  • FIG. 4 shows a kind of flat tree structure arising from FIG. 3 .
  • FIG. 4 illustrates potential control channel candidates for different aggregation possibilities (both the white and grey areas).
  • CCEs control channel elements
  • the 24 control channel elements each may form a control channel.
  • two control channel elements may be aggregated to form a control channel
  • in aggregation level 4 two control channel elements may be aggregated to form a control channel
  • four control channel elements may be aggregated to form a control channel
  • aggregation level 8 eight control channel elements may be aggregated to form a control channel.
  • the control channel structure shown by the white and grey areas in FIG. 4 is put under limitations, such that only the white aggregated control channel candidates are available for scheduling.
  • the number of decoding attempts is reduced to 15 (the grey areas are not decoded in search for a control channel candidate), which corresponds to a reduction by a factor of 3.
  • there are four control channel candidates in aggregation level 1 four control channel candidates in aggregation level 2 , four control channel candidates in aggregation level 4 , and three control channel candidates in aggregation level 8 .
  • control channels at each layer is not important.
  • usage of the smallest control channel on all control channel elements is prohibited, while at the same time the smaller control channels are allowed to be combined to aggregated control channels with better coverage.
  • the number of decoding attempts that is needed by each UE can be reduced.
  • the limitation of the tree is possible due to the frequency diversity applied for all control channel elements, such that each CCE experiences same or similar channel conditions.
  • FIG. 5 shows a schematic block diagram illustrating a user equipment 10 and a network device 20 , such as an eNB, according to an embodiment.
  • the user equipment 10 includes a receiving/transmitting section 11 and a decoding section 12 .
  • the receiving/transmitting section 11 receives symbols from the network device 20 , which includes a receiving transmitting section 21 transmitting the symbols and an allocation section 22 .
  • the allocation section 22 allocates control channels represented by nodes of a tree structure, each of the control channels having at least one control channel element carrying information for a respective identifier used to detect a control channel of the control channels, wherein the allocation is performed by limiting allocation of highest level control channels of the control channels, the highest level control channels being represented by nodes of the tree structure at a highest level of the tree structure. For example, in FIG. 1 the highest level is shown by level 3 . Referring to FIG. 4 , the highest level is represented by aggregation level 1 .
  • the allocation section 22 may increase allocation of lower level control channels of the control channels, the lower level control channels being represented by nodes of the tree structure at lower levels of the tree structure.
  • the lower levels are shown by levels 2 and 1 .
  • the lower levels are represented by aggregation levels 2 , 4 and 8 .
  • the receiving/transmitting section 21 may transmit the allocated control channels as symbols to user equipments including the user equipment 10 , by distributing the allocated control channels to sub-carriers over a system bandwidth.
  • the higher level control channels may be combined to the lower level control channels.
  • smaller control channels are allowed to be combined to aggregated control channels with better coverage.
  • the allocation section 22 may increase allocation more the lower the level of the tree structure.
  • the searching section 12 of the user equipment 10 searches for a control channel by decoding control channels represented by nodes of a tree structure, by using an identifier such as an MAC ID, CRC or c-RNTI, each of the control channels having at least one control channel element carrying information for a respective identifier used to detect a control channel of the control channels, wherein the searching section 12 limits the searching for highest level control channels of the control channels, the highest level control channels being represented by nodes of the tree structure at a highest level of the tree structure.
  • an identifier such as an MAC ID, CRC or c-RNTI
  • the searching section 12 may increase the searching for lower level control channels of the control channels, the lower level control channels being represented by nodes of the tree structure at lower levels of the tree structure.
  • the receiving/transmitting section 11 may receive the control channels as symbols from the network device 20 .
  • the searching section 11 may begin the searching with lowest level control channels represented by nodes of the tree structure at a lowest level of the tree structure.
  • the lowest level is shown by level 1 .
  • the lowest level is represented by aggregation level 8 .
  • the network device 20 and user equipment 10 shown in FIG. 5 may have further functionality for working e.g. as eNodeB and UE.
  • the functions of the network device and user equipment relevant for understanding the principles are described using functional blocks as shown in FIG. 5 .
  • the arrangement of the functional blocks of the network device and user equipment is not construed to limit the invention, and the functions may be performed by one block or further split into sub-blocks.
  • control channels represented by nodes of a tree structure are allocated, each of the control channels having at least one control channel element carrying information for a respective identifier used to detect a control channel of the control channels.
  • the allocation is performed by limiting allocation of highest level control channels of the control channels, the highest level control channels being represented by nodes of the tree structure at a highest level of the tree structure.
  • a control channel is searched for by decoding the allocated control channels, wherein the searching is limited for the highest level control channels.
  • the system also includes permanent or removable storage, such as magnetic and optical discs, RAM, ROM, etc. on which the process and data structures of the present invention can be stored and distributed.
  • the processes can also be distributed via, for example, downloading over a network such as the Internet.
  • the system can output the results to a display device, printer, readily accessible memory or another computer on a network.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)
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Applications Claiming Priority (4)

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EP07107652.5 2007-05-07
EP07107652.5A EP1990926B1 (en) 2007-05-07 2007-05-07 Control channels in communication network systems
EP07107652 2007-05-07
PCT/EP2008/055557 WO2008135575A1 (en) 2007-05-07 2008-05-06 Control channels in communication network systems

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US15/050,011 Continuation US9877277B2 (en) 2007-05-07 2016-02-22 Searching for control channels in a wireless network

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US15/050,011 Active 2028-09-29 US9877277B2 (en) 2007-05-07 2016-02-22 Searching for control channels in a wireless network
US15/876,917 Active US10716063B2 (en) 2007-05-07 2018-01-22 Searching for control channels in a wireless network
US16/928,749 Active 2028-08-01 US11388664B2 (en) 2007-05-07 2020-07-14 Searching for control channels in a wireless network
US17/862,925 Active US11647458B2 (en) 2007-05-07 2022-07-12 Searching for control channels in a wireless network
US18/144,710 Pending US20230276356A1 (en) 2007-05-07 2023-05-08 Searching for control channels in a wireless network

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US15/876,917 Active US10716063B2 (en) 2007-05-07 2018-01-22 Searching for control channels in a wireless network
US16/928,749 Active 2028-08-01 US11388664B2 (en) 2007-05-07 2020-07-14 Searching for control channels in a wireless network
US17/862,925 Active US11647458B2 (en) 2007-05-07 2022-07-12 Searching for control channels in a wireless network
US18/144,710 Pending US20230276356A1 (en) 2007-05-07 2023-05-08 Searching for control channels in a wireless network

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CN (1) CN101689884B (pt)
AU (1) AU2008248616B2 (pt)
BR (1) BRPI0811550B1 (pt)
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