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WO2013131262A1 - Procédé et appareil permettant de fournir des informations système pour des dispositifs à bande passante limitée - Google Patents

Procédé et appareil permettant de fournir des informations système pour des dispositifs à bande passante limitée Download PDF

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Publication number
WO2013131262A1
WO2013131262A1 PCT/CN2012/072079 CN2012072079W WO2013131262A1 WO 2013131262 A1 WO2013131262 A1 WO 2013131262A1 CN 2012072079 W CN2012072079 W CN 2012072079W WO 2013131262 A1 WO2013131262 A1 WO 2013131262A1
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WIPO (PCT)
Prior art keywords
sib
bandwidth
information
limited
dependent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/072079
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English (en)
Inventor
Wei Bai
Shuang TAN
Na WEI
Jing HAN
Chunyan Gao
Haiming Wang
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Renesas Electronics Corp
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Renesas Mobile Corp
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Filing date
Publication date
Application filed by Renesas Mobile Corp filed Critical Renesas Mobile Corp
Priority to PCT/CN2012/072079 priority Critical patent/WO2013131262A1/fr
Publication of WO2013131262A1 publication Critical patent/WO2013131262A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • An example embodiment of the present invention relates generally to wireless networks and, more particularly, to providing system information for limited-bandwidth devices.
  • LTE Long Term Evolution
  • RATs Radio Access Technologies
  • GSM Global System for Mobile Communications
  • GPRS General Packet Radio Service
  • MTC devices usually target low-end (low cost, low data rate) applications that can be handled adequately by GPRS on the 2 nd Generation (2G) and 3 rd Generation (3G) GSM networks. Owing to the low cost of these devices and good coverage of GSM GPRS, there is very little motivation for MTC device suppliers to use modules supporting the LTE radio interface. As more and more MTC devices are deployed in the field, this naturally increases the reliance on GSM GPRS networks. Not only will maintaining GSM GPRS networks in addition to LTE networks cost operators more, the non-optimal spectrum efficiency of GSM/GPRS will also prevent operators from reaping the maximum benefit of their allocated spectrum. Given the high number of MTC devices currently deployed and likely to be deployed in the future, the overall resources that network operators will need for service provision may be both significant and inefficiently assigned.
  • a method, apparatus, and computer program product are provided according to an example embodiment in order to provide system information to limited- bandwidth devices.
  • the method, apparatus, and computer program product may prepare System Information Blocks (STBs) for reception by all limited-bandwidth devices, regardless of their particular bandwidth capabilities.
  • STBs System Information Blocks
  • a way of allocating resources for an SD3-1 is also provided.
  • the various embodiments thus provide an efficient way to provide system information to limited-bandwidth devices.
  • a method includes receiving a system information block (SIB) at a limited-bandwidth device, the SIB comprising bandwidth- independent information and information related to one or more bandwidth-dependent information options. The method further includes reading the bandwidth-independent information directly and reading bandwidth-dependent information indirectly by using the information related to the one or more bandwidth-dependent information options.
  • a method is provided that includes preparing an SIB, allocating resources for the SIB, and causing the SIB to be transmitted to a limited-bandwidth device using the allocated resources.
  • allocating resources for the SIB involves allocating resources according to either a fixed scheme, a hopping scheme, or a blind decoding scheme.
  • preparing the SIB includes causing bandwidth-independent information and information related to one or more bandwidth-dependent information options to be included in the SIB.
  • preparing the SIB includes causing scheduling information for subsequent SIBs to be included in the SIB.
  • the scheduling information includes one or more of a periodicity, a frequency resource allocation, or a modulation and coding scheme (MCS).
  • an apparatus in a further embodiment, includes at least one processor and at least one memory storing computer program instruction therein, the memory and computer program instructions being configured to, with the at least one processor, cause the apparatus to at least receive a system information block (SIB) at a limited-bandwidth device, the SIB comprising bandwidth-independent information and information related to one or more bandwidth-dependent information options.
  • SIB system information block
  • the apparatus is further caused to read the bandwidth-independent information directly and read bandwidth-dependent information indirectly by using the information related to the one or more bandwidth-dependent information options.
  • an apparatus in another embodiment, includes at least one processor and at least one memory storing computer program instruction therein, the memory and computer program instructions being configured to, with the at least one processor, cause the apparatus to at least prepare an SIB, allocate resources for the SIB, and cause the SIB to be transmitted to a limited-bandwidth device using the allocated resources.
  • the apparatus of this embodiment is caused to allocate resources for the SIB according to either a fixed scheme, a hopping scheme, or a blind decoding scheme.
  • the apparatus is caused to prepare the SIB by causing bandwidth-independent information and information related to one or more bandwidth-dependent information options to be included in the SIB.
  • the apparatus is caused to prepare the SIB by causing scheduling information for subsequent SIBs to be included in the SIB.
  • the scheduling information includes one or more of a periodicity, a frequency resource allocation, or a modulation and coding scheme (MCS).
  • a computer program product includes a non- transitory computer readable medium storing computer program instructions therein, the computer program instructions being configured to, upon execution, cause an apparatus to at least receive a system information block (SIB) at a limited-bandwidth device, the SIB
  • SIB system information block
  • the computer program instructions are further configured to, upon execution, cause the apparatus to read the bandwidth-independent
  • a computer program product includes a non-transitory computer readable medium storing computer program instructions therein, the computer program
  • the computer program instructions being configured to, upon execution, cause an apparatus to at least prepare an SIB, allocate resources for the SIB, and cause the SIB to be transmitted to a limited-bandwidth device using the allocated resources.
  • the computer program instructions of this embodiment are configured to cause the apparatus to allocate resources for the SIB according to either a fixed scheme, a hopping scheme, or a blind decoding scheme.
  • the computer program instructions are configured to, upon execution, cause the apparatus to prepare the SIB by causing bandwidth-independent information and information related to one or more bandwidth-dependent information options to be included in the SIB.
  • the computer program instructions are configured to, upon execution, cause the apparatus to prepare the SIB by causing scheduling information for subsequent SIBs to be included in the SIB.
  • the scheduling information includes one or more of a periodicity, a frequency resource allocation, or a modulation and coding scheme (MCS).
  • MCS modulation and coding scheme
  • an apparatus in a further embodiment, includes means for receiving a system information block (SIB) at a limited-bandwidth device, the SIB comprising bandwidth- independent information and information related to one or more bandwidth-dependent information options.
  • the apparatus further includes means for reading the bandwidth- independent information directly and means for reading bandwidth-dependent information indirectly by using the information related to the one or more bandwidth-dependent information options.
  • an apparatus in another embodiment, includes means for preparing an SIB, means for allocating resources for the SIB, and means for causing the SIB to be transmitted to a limited-bandwidth device using the allocated resources.
  • the means for allocating resources for the SIB include means for allocating resources according to either a fixed scheme, a hopping scheme, or a blind decoding scheme.
  • the means for preparing the SIB include means for including causing bandwidth- independent information and information related to one or more bandwidth-dependent information options to be included in the SIB.
  • the means for preparing the SIB include means for causing scheduling information for subsequent SIBs to be included in the SIB.
  • the scheduling information includes one or more of a periodicity, a frequency resource allocation, or a modulation and coding scheme (MCS).
  • MCS modulation and coding scheme
  • Figure 1 is an illustration of a system depicting communications between a communication device and a network via a base station in which system information may be provided in accordance with an example embodiment of the present invention
  • Figure 2 is a block diagram of an apparatus that may be configured in accordance with an example embodiment of the present invention.
  • Figure 3 is a diagram depicting a frequency spectrum supported by example full and limited-bandwidth devices;
  • Figure 4 is a flowchart depicting the operations performed by an apparatus embodied by or otherwise associated with a limited-bandwidth device in accordance with an embodiment of the present invention;
  • Figure 5 is a flowchart depicting the operations performed by an apparatus embodied by or otherwise associated with a base station in accordance with an embodiment of the present invention'
  • Figure 6 is a diagram depicting an example of a fixed resource allocation scheme for transmitting a system information block in accordance with an embodiment of the present invention.
  • Figure 7 is a diagram depicting an example of a pre-defined hopping pattern resource allocation scheme for transmitting a system information block in accordance with an
  • circuitry refers to all of the following:
  • circuits such as a microprocessors or a portion of a microprocessors
  • circuitry applies to all uses of this term m this application, including in any claims.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • circuitry would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or application specific integrated circuit for a mobile phone or a similar integrated circuit in a server, a cellular network device, or other network device.
  • FIG. 1 a system that supports communications between a limited- bandwidth communication device 1 and a network 14, such as a Universal Mobile
  • UMTS Telecommunications System
  • LTE Long Term Evolution
  • LTE- A LTE- Advanced
  • GSM Global Systems for Mobile communications
  • CDMA Code Division Multiple Access
  • WCDMA Wideband CDMA
  • CDMA2000 Code Division Multiple Access 2000
  • GPRS General Packet Radio Service
  • a limited-bandwidth device refers to any communication device which supports, e.g., is capable of communicating over, some subset of the entire available bandwidth of a network.
  • Limited-bandwidth devices may be employed including, for example, a mobile communication device such as, for example, a mobile telephone, portable digital assistant (PDA), pager, laptop computer, a tablet computer, or any of numerous other hand held or portable communication devices, computation devices, content generation devices, content consumption devices, data card, Universal Serial Bus (USB) dongle, or combinations thereof.
  • Limited-bandwidth devices may also include, for example, Machine-Type Communications (MTC) devices which communicate through a network 14 without human intervention. Regardless of the type of limited-bandwidth device, it may communicate with the network via a base station 12, such as a Node B, an evolved Node B (eNB), a relay node, or other type of access point.
  • the communications between the limited- bandwidth device 10 and the base station 12 may include the transmission of data via an uplink that is granted between the limited-bandwidth device 10 and the base station 12.
  • the limited-bandwidth device 10 and the base station 12 may embody or otherwise be associated with an apparatus 20 that is generally depicted in Figure 2 and that may be configured in accordance with an example embodiment of the present invention as described below.
  • the components, devices or elements described below may not be mandatory and thus some may be omitted in certain embodiments. Additionally, some embodiments may include further or different components, devices or elements beyond those shown and described herein.
  • the apparatus 20 may include or otherwise be in
  • the processing circuitry may be configured to perform data processing, application execution and/or other processing and management services according to an example embodiment of the present invention.
  • the apparatus or the processing circuitry may be embodied as a chip or chip set
  • the apparatus or the processing circuitry may comprise one or more physical packages (e.g., chips) including materials, components and/or wires on a structural assembly (e.g., a baseboard).
  • the structural assembly may provide physical strength
  • the apparatus or the processing circuitry may therefore, in some cases, be configured to implement an embodiment of the present invention on a single chip or as a single "system on a chip.”
  • a chip or chipset may constitute means for performing one or more operations for providing the functionalities described herein.
  • the processing circuitry may include a processor 22 and memory 24 that may be in communication with or otherwise control a communication interface 26 and, in some cases in which the apparatus is embodied by the limited-bandwidth device 10, a user interface 28.
  • the processing circuitry may be embodied as a circuit chip (e.g., an integrated circuit chip) configured (e.g., with hardware, software or a combination of hardware and software) to perform operations described herein.
  • the processing circuitry may be embodied as a portion of the limited-bandwidth device or the base station.
  • the user interface 28 may be in communication with the processing circuitry to receive an indication of a user input at the user interface and/or to provide an audible, visual, mechanical or other output to the user.
  • the user interface may include, for example, a keyboard, a mouse, a joystick, a display, a touch screen, a microphone, a speaker, and/or other input/output mechanisms.
  • the communication interface 26 may include one or more interface mechanisms for enabling communication with other devices and/or networks.
  • the communication interface may be any means such as a device or circuitry embodied in either hardware, or a combination of hardware and software that is configured to receive and/or transmit data from to a network 14 and or any other device or module in communication with the processing circuitry, such as between the limited-bandwidth device 10 and the base station 12.
  • the communication interface may include, for example, an antenna (or multiple antennas), such as an antenna (or multiple antennas) capable of communicating over radio frequencies (RF), and supporting hardware and/or software, such as RF circuitry, for enabling conimuni cations with a wireless communication network.
  • the communication interface 26 may also or alternatively include a communication modem or other hardware/software for supporting communication via cable, digital subscriber line (DSL), universal serial bus (USB), Ethernet or other methods.
  • the memory 24 may include one or more non-transitory memory devices such as, for example, volatile and/or non-volatile memory that may be either fixed or removable.
  • the memory may be configured to store information, data, applications, instructions or the like for enabling the apparatus 20 to carry out various functions in accordance with example embodiments of the present invention.
  • the memory could be configured to buffer input data for processing by the processor 22.
  • the memory could be configured to store instructions for execution by the processor.
  • the memory may include one of a plurality of databases that may store a variety of files, contents or data sets. Among the contents of the memory, applications may be stored for execution by the processor in order to carry out the functionality associated with each respective application.
  • the memory may be in communication with the processor via a bus for passing information among components of the apparatus.
  • the processor 22 may be embodied in a number of different ways.
  • the processor may be embodied as various processing means such as one or more of a
  • the processor may be configured to execute instructions stored in the memory 24 or otherwise accessible to the processor.
  • the processor may represent an entity (e.g., physically embodied in circuitry - in the form of processing circuitry) capable of performing operations according to embodiments of the present invention while configured accordingly.
  • the processor when the processor is embodied as an ASIC, FPGA, DSP or the like, the processor may be specifically configured hardware for conducting the operations described herein.
  • the processor when the processor is embodied as an executor of software instructions, the instructions may specifically configure the processor to perform the operations described herein.
  • FIGS 4 and 5 are flowcharts illustrating the operations performed by a method, apparatus and computer program product, such as apparatus 20 of Figure 2 in accordance with an example embodiment of the present invention as embodied by a base station 2 and a limited- bandwidth device 10, respectively.
  • a method, apparatus and computer program product such as apparatus 20 of Figure 2 in accordance with an example embodiment of the present invention as embodied by a base station 2 and a limited- bandwidth device 10, respectively.
  • each block of the flowcharts, and combinations of blocks in the flowcharts may be implemented by various means, such as hardware, firmware, processor, circuitry and/or other device associated with execution of software including one or more computer program instructions.
  • one or more of the procedures described above may be embodied by computer program instructions.
  • the computer program instructions which embody the procedures described above may be stored by a memory 24 of an apparatus employing an embodiment of the present invention and executed by a processor 22 in the apparatus.
  • any such computer program instructions maybe loaded onto a computer or other programmable apparatus (e.g., hardware) to produce a machine, such that the resulting computer or other programmable apparatus provides for implementation of the functions specified in the flowchart blocks.
  • These computer program instructions may also be stored in a non-transitory computer-readable storage memory that may direct a computer or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage memory produce an article of manufacture, the execution of which implements the function specified in the flowchart blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart blocks.
  • the operations of Figures 4 and 5 when executed, convert a computer or processing circuitry into a particular machine configured to perform an example embodiment of the present invention.
  • the operations of Figures 4 and S define an algorithm for configuring a computer or processing circuitry, e.g., processor, to perform an example embodiment.
  • a general purpose computer may be provided with an instance of the processor which performs the algorithm of Figures 4 and 5 to transform the general purpose computer into a particular machine configured to perform an example embodiment.
  • blocks of the flowcharts support combinations of means for performing the specified functions and combinations of operations for performing the specified functions. It will also be understood that one or more blocks of the flowcharts, and combinations of blocks in the flowcharts, can be implemented by special purpose hardware-based computer systems which perform the specified functions, or combinations of special purpose hardware and computer instructions.
  • FIG. 3 depicts the full available frequency spectrum of an example LTE network.
  • a full-bandwidth device operating on an LTE network would support all 20MHz of the available bandwidth 33.
  • Limited-bandwidth devices would support a subset of the available 20Mhz of bandwidth 33.
  • a limited-bandwidth device may support SMhz of bandwidth 32,
  • UE system information
  • MIB Master Information Block
  • PHICH Physical Hybrid Automatic Repeat Request Indicator Channel
  • SFN System Frame Number
  • the full- bandwidth UE 1 1 then tries to detect the Physical Downlink Control Channel (PDCCH) addressed to the System Information- Radio Network Temporary Identifier (SI-RNTI) in order to read the System Information Block Typel (SIB-1).
  • PDCH Physical Downlink Control Channel
  • SI-RNTI System Information- Radio Network Temporary Identifier
  • SHB-1 contains important cell access related information, such as the Public Land Mobile Network (PLMN) identity list, tracking area information, cell identity, etc. SIB-1 also contains the scheduling information for other SI blocks (SIBs). SIBs. Limited-bandwidth devices, however, may not be able to receive and decode SIB-1 because it can be scheduled and transmitted on the whole bandwidth.
  • PLMN Public Land Mobile Network
  • SIBs SI blocks
  • the first option is for the base station 12 to only send SIB-1 and other SIBs in the Physical Resource Blocks (PRBs) which falls into the bandwidth of limited- bandwidth devices with the narrowest bandwidth, and to then have the limited-bandwidth device decode the Enhanced-PDCCH (E-PDCCH) to locate the SIB.
  • PRBs Physical Resource Blocks
  • E-PDCCH Enhanced-PDCCH
  • a system may have a mix of limited-bandwidth devices, the narrowest of which supports 1.4MHz.
  • the SI must be transmitted in the central 6 PRBs to make it accessible to all the devices.
  • frequency selective scheduling could achieve quite little gain, so having the limited-bandwidth device monitor the E-PDCCH to get the resource allocation for SIBs would only add unnecessary overhead from the perspective of signaling and device power consumption.
  • its payload size is 120 bits if we do not consider optional fields. If we consider the channel coding with 1/3 coding rate and 24 bit Cyclic Redundancy Check (CRC), the channel bits should be
  • a PDCCH sent in the common search space only has an aggregation level of 4 or 8. This means that if an aggregation level of 4 is applied, the PDCCH will be mapped to 4 Control Channel Elements (CCEs) which has the same size as one PRB. If an aggregation level of 8 is applied, the PDCCH will be mapped to 8 CCEs, which has the size of two PRBs. Thus, the overhead of the E-PDCCH will be same as the payload size of the data.
  • CCEs Control Channel Elements
  • the second possible solution is to have the base station send separate SIBs for limited-bandwidth devices which have different bandwidth capability.
  • different kinds of devices will monitor Physical Downlink Control Channel PDCCH or Enhanced Physical Downlink Control Channel E-PDCCH to get the resource allocation of its own SIB within the bandwidth it supports, and then read the system information according to the indication.
  • the apparatus may include means, such as the processing circuitry, the processor 22, the memory 24, the communications interface 26 or the like, for preparing a system information block (SIB), such as a SIB-1. See block 40 of Figure 4. It should be understood that the SIB-1 prepared by the apparatus 20, as well as subsequent SIBS discussed below, may in some embodiments be limited-bandwidth dedicated SIBs.
  • SIB system information block
  • the apparatus 20 may cause scheduling information for one or more subsequent SUBs, such as a SIB type-2, type-3, etc., to be included in the SIB-1. See block 41 .
  • This scheduling information may include one or more of the periodicity, frequency resource allocation, and/or a modulation and coding scheme (MCS).
  • MCS modulation and coding scheme
  • the scheduling information may include all three, i.e., a periodicity, a frequency resource allocation, and a MCS.
  • the scheduling information may apply to one, more, or all of the subsequent SIBs.
  • the MCS may be a single MCS or a plurality of possible MCSs.
  • the apparatus may also optionally include E-control channel configuration information in the SIB-1. See block 41b.
  • the E-control channel configuration information may include, for example, E-PDCCH configuration information or enhanced PHICH (E-PHICH) configuration information.
  • the apparatus 20 may also cause information to be made available to a limited- bandwidth receiving device 10 through the SIB in different ways depending on whether the information is bandwidth-independent or bandwidth-dependent. See block 41c.
  • Bandwidth- independent information is any data, such as system information, configuration data or the like, that does not depend on or is otherwise irrelevant to the bandwidth capabilities of the receiving device.
  • Bandwidth-dependent information is any information, such as system information, configuration data or the like, that depends on or is otherwise relevant to the bandwidth capabilities of the receiving device. For example, considering only SIB-2 for a moment, Bandwidth-independent information may include, for example, ac-Barringlnfo and
  • Bandwidth-dependent information may include, for example, radioResourceConfigCommon and freqlnfo. Further examples of bandwidth- independent and dependent information are provided in 3GPP TS36.331, section 6.3.1.
  • the apparatus may cause bandwidth-independent information to be included in the SIB. See block 41c.
  • a receiving device such as a limited-bandwidth device 10
  • the apparatus 20 may also cause information relating to one or more bandwidth-dependent information options to be included in the SIB.
  • a receiving device may read the bandwidth- dependent information indirectly.
  • the information relating to the bandwidth-dependent information options may be a configuration table which includes one or more information options, each corresponding to one or more respective bandwidth capabilities.
  • the receiving device may indirectly read the bandwidth-dependent information by locating the entry corresponding to its associated bandwidth capability and then reading from that entry.
  • the information relating to the one or more bandwidth- dependent information options may be a configuration index that is understood differently by receiving devices with different bandwidth capabilities.
  • the receiving device may indirectly read the bandwidth-dependent information by using the configuration index to reference a predefined configuration table associated with its supported bandwidth.
  • the configuration table of this embodiment may be stored locally in the receiving device, provided by the network 14, or otherwise made available to the receiving device.
  • the different bandwidth capabilities may have the same number of available information options, but this is not required.
  • ScheduIinglnfoList :: SEQUENCE (SIZE (l..maxSI-Message)) OF Schedulinglnfo
  • the apparatus 20 may further include means, such as the processing circuitry, the processor 22, the memory 24, the communications interface 26 or the like, for allocating resources for transmitting the SIB, such as an SIB-1, according to a particular allocation scheme. See block 42.
  • the apparatus may allocate physical resource blocks (PRBs) 61 of the PDSCH which carries the SIB according to a particular allocation scheme.
  • PRBs physical resource blocks
  • the apparatus may allocate resources for transmitting SIB-1 based on a fixed scheme. See block 43a.
  • a fixed scheme may involve allocating one or more PRBs 61 that are fixed in the frequency domain.
  • the SIBs may be transmitted within the supported bandwidth of the most bandwidth-limited limited- bandwidth device.
  • the apparatus may allocate resources for transmitting an SIB, such as an SIB-1 , based on a hopping scheme. See block 43b of Figure 4.
  • a hopping scheme may involve allocating one or more PRBs 61 based on a pre-defined hopping pattern.
  • the apparatus 20 may use an input, such as the SFN or Cell index, to determine how to allocate one or more PRBs.
  • the apparatus 20 may allocate resources for transmitting the SIB, such as an SIB-1, based on a blind decoding scheme.
  • the apparatus may allocate resources in a manner which allows the receiving device, such as a limited-bandwidth device 10, to receive SIB-1 using a blind decoding technique.
  • the apparatus 20 may define a fixed Modulation and Coding Scheme (MCS) and allocate a variable resource length (e.g., a variable number of PRBs), with a limited set of possible resource lengths, for the PDSCH which carries SIB-1 , and let the receiving device use the given MCS to perform blind decoding on the SIB-1.
  • MCS Modulation and Coding Scheme
  • the size of the SIB may vary from time to time, with additional PRBs being allocated as needed.
  • the apparatus 20 may allocate a fixed resource length and use a limited number of possible MCSs for the PDSCH which carries SIB-1 and let the receiving device use the given resource to perform blind decoding on the SIB-1.
  • the MCS may be adjusted to suit the SIB size. For example, if the SIB size is small, a QPSK MCS may be used. If, for example, the SIB size is large, a 16QAM MCS may be used. An identical resource allocation and MCS may be used within a given modification period of the system information in order to reduce complexity.
  • the most aggressive MCS option e.g., the MCS option with the highest coding rate which can carry the most information with the resource
  • the most aggressive MCS option may be chosen to provide sufficient performance taking into consideration the lowest signal to noise ratio (SNR) at the edge of a given cell and after being tran-flmtted/retransmitted four times, e.g., transmitted a first time then retransmitted 3 additional times.
  • SNR signal to noise ratio
  • the apparatus 20 may allocate one or more PRBs that are fixed or that hop in the frequency domain and also use a variable resource length (e.g., a variable number of PRBs) along with a fixed MCS.
  • a variable resource length e.g., a variable number of PRBs
  • additional PRBs may be allocated from time to time.
  • the PRBs may, for example, be added based on a pre-defined rule.
  • the pre-defined hopping pattern may provide how additional PRBs are allocated or how previously allocated PRBs are deallocated.
  • the apparatus may allocate one or more PRBs that are fixed or that hop in the frequency domain and use a fixed resource length (e.g., a fixed number of PRBs) along with a variable MCS (e.g., a limited number of possible MCSs).
  • a fixed resource length e.g., a fixed number of PRBs
  • a variable MCS e.g., a limited number of possible MCSs.
  • the apparatus 20 may further include means, such as the processing circuitry, the processor 22, the memory 24, the communications interface 26 or the like, for causing the SIB, e.g., SIB-1, to be transmitted using the allocated resources. See block 44.
  • the apparatus 20 may further include means, such as the processing circuitry, the processor 22, the memory 24, the communications interface 26 or the like, for preparing one or more subsequent S Bs. See block 46 of Figure 4. As it did with the SIB-1, the apparatus may include bandwidth-independent information and information relating to one or more bandwidth- dependent information options in the subsequent SIBs. See block 41c. Thus, as previously discussed in regards to SIB-1, the receiving device, such as a limited-bandwidth device 10, can directly read the bandwidth-independent information and indirectly read the bandwidth- dependent information. The apparatus 20 may further include means, such as the processing circuitry, the processor 22, the communications interface 26 or the like, for causing one or more subsequent SIBs to be transmitted according to the scheduling information provided in the SIB-1. See block 48.
  • the apparatus 20 may include means, such as the processing circuitry, the processor 22, the memory 24, the communications interface 26 or the like, for receiving a SIB, e.g., SIB-1. See block SO of Figure 5.
  • the SIB may, for example, be transmitted by the base station 12 as described above.
  • Receiving the SIB may first involve determining what resources have been allocated to the SIB.
  • the apparatus 20 embodied by or otherwise associated with the limited-bandwidth device may use the SFN or Cell index to make this determination.
  • the apparatus 20 may receive the SIB by performing blind decoding, as discussed above.
  • the SIB may be configured, such as by an apparatus 20 embodied by or otherwise associated with base station 12, to include or otherwise make available to the receiving device 10, data in more than one way, depending on the characteristics of the data.
  • the SIB may include bandwidth-independent information and information relating to one or more bandwidth-dependent information options.
  • the apparatus 20 associated with limited- bandwidth device 10 may also include means, such as the processor 22, the memory 24, the communications interface 26 or the like, for reading bandwidth-independent information directly from the SIB and reading bandwidth-dependent information indirectly.
  • the SIB may be prepared, such as by an apparatus 20 embodied by or otherwise associated with base station 12, so as to contain the bandwidth-independent information in a format which allows the receiving device, such as the limited-bandwidth device 10, to read it directly. See block 51a.
  • the SIB may also be prepared, such as by the apparatus 20 embodied by or otherwise associated with base station 12, to include information related to one or more bandwidth-dependent information options.
  • the actual bandwidth-dependent information may or may not be contained in the SIB and may be made available in a format that allows the receiving device, such as limited-bandwidth device 10 to read it indirectly.
  • the apparatus 20 associated with limited-bandwidth device 10 may use a pre-defined configuration table to read the bandwidth-dependent data.
  • the apparatus 20 associated with the base station 12 may prepare the SIB by including a configuration index in the SIB.
  • the configuration index may be understood differently by different receiving devices 10 based on their bandwidth capabilities.
  • different limited-bandwidth devices 10 may have access to different bandwidth capability-specific configuration tables.
  • a limited-bandwidth device 10 which supports a given bandwidth may use the configuration index read from the SIB to reference a configuration table associated with the given bandwidth and read corresponding bandwidth-dependent information.
  • the configuration table may be stored on the device 10, provided by the network, or otherwise made available to the device 10.
  • bandwidth-dependent information for a plurality of different bandwidth capabilities may be contained in the SIB, such as in a configuration table.
  • a limited-bandwidth device 10 may, for example, indirectly read the bandwidth-dependent information by determining which entry of the configuration table corresponds to the device's supported bandwidth and then reading the corresponding bandwidth-dependent information. It will be understood that many other ways of indirectly reading bandwidth-dependent information are possible and that the method and apparatus are not limited to any one particular embodiment
  • the apparatus 20 may further include means, such as the processing circuitry, the processor 22, the memory 24, the communications interface 26 or the like, for reading scheduling information for subsequent SIBs that is included in SIB-1. See block 52.
  • the scheduling included in the SIB-1 may include one or more of the periodicity, frequency resource allocation, time resource allocation and/or a modulation and coding scheme (MCS) for one or more or all of the subsequent SIBs.
  • MCS modulation and coding scheme
  • the MCS may be a single MCS or a plurality of possible MCSs and the SIB-1 may also include E-control channel configuration information that may be read by the apparatus 20 associated with the limited-bandwidth device
  • one or more of the subsequent SIBs may also include bandwidth- independent information which the apparatus 20 can read directly and information related to one or more bandwidth-dependent information options, such that the apparatus 20 can indirectly read the bandwidth-dependent information, such as by using a configuration table. See blocks 51 and
  • Embodiments according to the invention may provide many benefits in a system including limited-bandwidth devices.
  • networks such as LTE networks, may be made accessible to devices with different bandwidth capabilities.
  • Embodiments of the present invention may also save control signaling overhead without the loss of frequency selective SIB scheduling gains associated with transmitting SIBs within the smallest supported bandwidth.
  • embodiments of the present invention may allow SIB sizes to be expanded or reduced as needed or appropriate through the use of flexible resource lengths and blind decoding.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Procédé, appareil et produit de programme informatique permettant de fournir des informations de système pour dispositifs à bande passante limitée. Dans le contexte d'un procédé, un Bloc d'Informations Système de type 1 (SIB -1) peut être préparé. Le procédé peut également consister à attribuer des ressources pour le SIB-1 et à transmettre le SIB -1 à un dispositif à bande passante limitée à l'aide des ressources attribuées. Les ressources peuvent être attribuées en fonction d'un schéma fixe, d'un schéma de saut, ou d'un schéma de décodage aveugle. Également dans le contexte d'un procédé, un SIB (type 1 ou autre) peut être préparé de manière à comprendre des informations indépendantes de la bande passante qui peuvent être lues directement par un dispositif de réception et des informations se rapportant à des options d'informations dépendant de la bande passante, de telle sorte que les informations dépendant de la bande passante puissent être lues indirectement à l'aide des informations concernant les options d'informations dépendant de la bande passante.
PCT/CN2012/072079 2012-03-08 2012-03-08 Procédé et appareil permettant de fournir des informations système pour des dispositifs à bande passante limitée Ceased WO2013131262A1 (fr)

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US11950242B2 (en) 2015-08-18 2024-04-02 Apple Inc. Non-PDCCH signaling of SIB resource assignment
CN109076318A (zh) * 2016-06-24 2018-12-21 Oppo广东移动通信有限公司 信息传输方法和设备
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